YANG Data Model for L3VPN service delivery
draft-ietf-l3sm-l3vpn-service-model-06

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Replaces draft-ltsd-l3sm-l3vpn-service-model
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L3SM Working Group                                          S. Litkowski
Internet-Draft                                  Orange Business Services
Intended status: Standards Track                               R. Shakir
Expires: November 3, 2016                            Jive Communications
                                                             L. Tomotaki
                                                                 Verizon
                                                                K. Ogaki
                                                                    KDDI
                                                              K. D'Souza
                                                                     ATT
                                                            May 02, 2016

               YANG Data Model for L3VPN service delivery
                 draft-ietf-l3sm-l3vpn-service-model-06

Abstract

   This document defines a YANG data model that can be used to deliver a
   Layer 3 Provider Provisioned VPN service.  The document is limited to
   the BGP PE-based VPNs as described in RFC4110 and RFC4364.  This
   model is intended to be instantiated at management system to deliver
   the overall service.  This model is not a configuration model to be
   used directly on network elements.  This model provides an abstracted
   view of the Layer 3 IPVPN service configuration components.  It will
   be up to a management system to take this as an input and use
   specific configurations models to configure the different network
   elements to deliver the service.  How configuration of network
   elements is done is out of scope of the document.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any

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   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on November 3, 2016.

Copyright Notice

   Copyright (c) 2016 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   4
     1.2.  Tree diagram  . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Definitions . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Layer 3 IP VPN service model  . . . . . . . . . . . . . . . .   5
   4.  Service data model usage  . . . . . . . . . . . . . . . . . .   5
   5.  Design of the Data Model  . . . . . . . . . . . . . . . . . .   6
     5.1.  VPN service overview  . . . . . . . . . . . . . . . . . .  19
       5.1.1.  VPN service topology  . . . . . . . . . . . . . . . .  19
         5.1.1.1.  Route Target allocation . . . . . . . . . . . . .  19
         5.1.1.2.  Any to any  . . . . . . . . . . . . . . . . . . .  20
         5.1.1.3.  Hub and Spoke . . . . . . . . . . . . . . . . . .  21
         5.1.1.4.  Hub and Spoke disjoint  . . . . . . . . . . . . .  22
       5.1.2.  Cloud access  . . . . . . . . . . . . . . . . . . . .  22
       5.1.3.  Multicast service . . . . . . . . . . . . . . . . . .  24
       5.1.4.  Extranet VPNs . . . . . . . . . . . . . . . . . . . .  26
     5.2.  Site overview . . . . . . . . . . . . . . . . . . . . . .  27
       5.2.1.  Site network accesses . . . . . . . . . . . . . . . .  28
         5.2.1.1.  Bearer  . . . . . . . . . . . . . . . . . . . . .  29
         5.2.1.2.  Connection  . . . . . . . . . . . . . . . . . . .  29
     5.3.  Site role . . . . . . . . . . . . . . . . . . . . . . . .  30
     5.4.  Site belonging to multiple VPNs . . . . . . . . . . . . .  30
       5.4.1.  Site vpn flavor . . . . . . . . . . . . . . . . . . .  30
         5.4.1.1.  Single VPN attachment : site-vpn-flavor-single  .  30
         5.4.1.2.  Multi VPN attachment : site-vpn-flavor-multi  . .  31
         5.4.1.3.  Sub VPN attachment : site-vpn-flavor-sub  . . . .  31

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       5.4.2.  Attaching a site to a VPN . . . . . . . . . . . . . .  33
         5.4.2.1.  Reference a VPN . . . . . . . . . . . . . . . . .  33
         5.4.2.2.  VPN policy  . . . . . . . . . . . . . . . . . . .  34
     5.5.  Deciding where to connect the site  . . . . . . . . . . .  36
       5.5.1.  Parameter : Site location . . . . . . . . . . . . . .  37
       5.5.2.  Constraint : Site diversity . . . . . . . . . . . . .  37
       5.5.3.  Constraint : Site network access availability . . . .  39
         5.5.3.1.  Traffic protection  . . . . . . . . . . . . . . .  41
       5.5.4.  Route Distinguisher and VRF allocation  . . . . . . .  42
     5.6.  Deciding the access type for the site . . . . . . . . . .  42
     5.7.  Security  . . . . . . . . . . . . . . . . . . . . . . . .  43
       5.7.1.  Authentication  . . . . . . . . . . . . . . . . . . .  43
       5.7.2.  Encryption  . . . . . . . . . . . . . . . . . . . . .  43
     5.8.  Management  . . . . . . . . . . . . . . . . . . . . . . .  44
     5.9.  Routing protocols . . . . . . . . . . . . . . . . . . . .  44
       5.9.1.  Dual stack handling . . . . . . . . . . . . . . . . .  45
       5.9.2.  Direct LAN connection onto SP network . . . . . . . .  45
       5.9.3.  Direct LAN connection onto SP network with redundancy  46
       5.9.4.  Static routing  . . . . . . . . . . . . . . . . . . .  46
       5.9.5.  RIP routing . . . . . . . . . . . . . . . . . . . . .  46
       5.9.6.  OSPF routing  . . . . . . . . . . . . . . . . . . . .  46
       5.9.7.  BGP routing . . . . . . . . . . . . . . . . . . . . .  48
     5.10. Service . . . . . . . . . . . . . . . . . . . . . . . . .  50
       5.10.1.  Bandwidth  . . . . . . . . . . . . . . . . . . . . .  50
       5.10.2.  QoS  . . . . . . . . . . . . . . . . . . . . . . . .  50
         5.10.2.1.  QoS classification . . . . . . . . . . . . . . .  50
         5.10.2.2.  QoS profile  . . . . . . . . . . . . . . . . . .  53
       5.10.3.  Multicast  . . . . . . . . . . . . . . . . . . . . .  56
     5.11. Enhanced VPN features . . . . . . . . . . . . . . . . . .  56
       5.11.1.  Carrier's Carrier  . . . . . . . . . . . . . . . . .  56
       5.11.2.  Transport constraints  . . . . . . . . . . . . . . .  58
     5.12. External ID references  . . . . . . . . . . . . . . . . .  58
     5.13. Defining NNIs . . . . . . . . . . . . . . . . . . . . . .  59
     5.14. Using configuration templates . . . . . . . . . . . . . .  59
   6.  Service model usage example . . . . . . . . . . . . . . . . .  63
   7.  Interaction with Other YANG Modules . . . . . . . . . . . . .  67
   8.  YANG Module . . . . . . . . . . . . . . . . . . . . . . . . .  72
   9.  Security Considerations . . . . . . . . . . . . . . . . . . . 123
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . 124
   11. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 124
   12. References  . . . . . . . . . . . . . . . . . . . . . . . . . 124
     12.1.  Normative References . . . . . . . . . . . . . . . . . . 124
     12.2.  Informative References . . . . . . . . . . . . . . . . . 125
   Appendix A.  Example: NETCONF <get> Reply . . . . . . . . . . . . 125
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . . 126

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1.  Introduction

   This document defines a YANG data model for Layer 3 IPVPN service
   configuration.

1.1.  Terminology

   The following terms are defined in [RFC6241] and are not redefined
   here:

   o  client

   o  configuration data

   o  server

   o  state data

   The following terms are defined in [RFC6020] and are not redefined
   here:

   o  augment

   o  data model

   o  data node

   The terminology for describing YANG data models is found in
   [RFC6020].

1.2.  Tree diagram

   A simplified graphical representation of the data model is presented
   in Section 5.

   The meaning of the symbols in these diagrams is as follows:

   o  Brackets "[" and "]" enclose list keys.

   o  Curly braces "{" and "}" contain names of optional features that
      make the corresponding node conditional.

   o  Abbreviations before data node names: "rw" means configuration
      (read-write), and "ro" state data (read-only).

   o  Symbols after data node names: "?" means an optional node and "*"
      denotes a "list" or "leaf-list".

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   o  Parentheses enclose choice and case nodes, and case nodes are also
      marked with a colon (":").

   o  Ellipsis ("...") stands for contents of subtrees that are not
      shown.

2.  Definitions

   Customer Edge (CE) Device: The equipment on the customer site of the
   SP-customer location boundary.  The CE may be located in customer
   premise.  The CE is connected to one or more PEs.  The CE is
   dedicated to a particular customer.

   Provider Edge (PE) Device: The equipment on the SP side of the SP-
   customer location boundary.  The PE is located in SP premise.  The PE
   connects CEs.  The PE is shared between multiple customers.

   PE-Based VPNs: The PE devices know that certain traffic is VPN
   traffic.  They forward the traffic (through tunnels) based on the
   destination IP address of the packet, and optionally on based on
   other information in the IP header of the packet.  The PE devices are
   themselves the tunnel endpoints.  The tunnels may make use of various
   encapsulations to send traffic over the SP network (such as, but not
   restricted to, GRE, IP-in-IP, IPsec, or MPLS tunnels).

3.  Layer 3 IP VPN service model

   A Layer 3 IPVPN service is a collection of sites that are authorized
   to exchange traffic between each other over a shared IP
   infrastructure.  This layer 3 VPN service model aims at providing a
   common understanding on how the corresponding IP VPN service is to be
   deployed over the shared infrastructure.  This service model is
   limited to BGP PE-Based VPNs as described in [RFC4110] and [RFC4364].

4.  Service data model usage

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            L3VPN-SVC |
              MODEL   |
                      |
                   +------------------+         +-----+
                   |   Orchestration  | < --- > | OSS |
                   +------------------+         +-----+
                      |            |
              +----------------+   |
              | Config manager |   |
              +----------------+   |
                      |            |
                      | Netconf/CLI ...
                      |            |
        +------------------------------------------------+
                             Network

                           +++++++
                           + AAA +
                           +++++++

   +++++++  Bearer ++++++++             ++++++++       +++++++
   + CEA + ------- + PE A +             + PE B + ----- + CEB +
   +++++++  Cnct   ++++++++             ++++++++       +++++++

   Site A                                       Site B

   The idea of the L3 IPVPN service model is to propose an abstracted
   interface to manage configuration of components of a L3VPN service.
   A typical usage is to use this model as an input for an orchestration
   layer who will be responsible to translate it to orchestrated
   configuration of network elements who will be part of the service.
   The network elements can be routers, but also servers (like AAA), and
   not limited to these examples.  The configuration of network elements
   MAY be done by CLI, or by NetConf/RestConf coupled with specific
   configuration YANG data models (BGP, VRF, BFD ...) or any other way.

   The usage of this service model is not limited to this example, it
   can be used by any component of the management system but not
   directly by network elements.

5.  Design of the Data Model

   The YANG module is divided in three main containers : vpn-services,
   sites, site-templates.

   The vpn-svc under vpn-services defines global parameters for the VPN
   service for a specific customer.

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   A site is composed of at least one site-network-access and may have
   multiple site-network-access in case of multihoming.  The site-
   network-access attachment is done through a bearer with a connection
   (transport protocol) on top.  The bearer refers to physical
   properties of the attachment while the connection refers to more
   protocol oriented properties.

   Authorization of traffic exchange is done through what we call a VPN
   policy or VPN topology defining routing exchange rules between sites.

   The site-templates may be used as configuration templates for sites.
   Part of the site configuration can be inherited from templates.

   The figure below describe the overall structure of the YANG module:

module: ietf-l3vpn-svc
   +--rw l3vpn-svc
      +--rw vpn-services
      |  +--rw vpn-svc* [vpn-id]
      |     +--rw vpn-id                   svc-id
      |     +--rw customer-name?           string
      |     +--rw topology?                identityref
      |     +--rw cloud-access* [cloud-identifier] {cloud-access}?
      |     |  +--rw cloud-identifier        string
      |     |  +--rw authorized-sites* [site-id]
      |     |  |  +--rw site-id    leafref
      |     |  +--rw denied-sites* [site-id]
      |     |  |  +--rw site-id    leafref
      |     |  +--rw nat-enabled?            boolean
      |     |  +--rw customer-nat-address?   inet:ipv4-address
      |     +--rw multicast {multicast}?
      |     |  +--rw enabled?                 boolean
      |     |  +--rw customer-tree-flavors
      |     |  |  +--rw tree-flavor* [type]
      |     |  |     +--rw type    identityref
      |     |  +--rw rp
      |     |     +--rw rp-group-mappings
      |     |     |  +--rw rp-group-mapping* [id]
      |     |     |     +--rw id                  uint16
      |     |     |     +--rw provider-managed
      |     |     |     |  +--rw enabled?                    boolean
      |     |     |     |  +--rw rp-redundancy?              boolean
      |     |     |     |  +--rw optimal-traffic-delivery?   boolean
      |     |     |     +--rw rp-address?         inet:ip-address
      |     |     |     +--rw groups
      |     |     |        +--rw group* [id]
      |     |     |           +--rw id               uint16
      |     |     |           +--rw (group-format)?

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      |     |     |              +--:(startend)
      |     |     |              |  +--rw group-start?     inet:ip-address
      |     |     |              |  +--rw group-end?       inet:ip-address
      |     |     |              +--:(singleaddress)
      |     |     |                 +--rw group-address?   inet:ip-address
      |     |     +--rw rp-discovery
      |     |        +--rw rp-discovery-type?   identityref
      |     |        +--rw bsr-candidates
      |     |           +--rw bsr-candidate* [address]
      |     |              +--rw address    inet:ip-address
      |     +--rw carrierscarrier?         boolean {carrierscarrier}?
      |     +--rw transport-constraints {traffic-engineering}?
      |     |  +--rw unicast-transport-constraints
      |     |  |  +--rw constraints* [constraint-id]
      |     |  |     +--rw constraint-id      svc-id
      |     |  |     +--rw site1?             svc-id
      |     |  |     +--rw site2?             svc-id
      |     |  |     +--rw constraint-list* [constraint-type]
      |     |  |        +--rw constraint-type            identityref
      |     |  |        +--rw constraint-opaque-value?   string
      |     |  +--rw multicast-transport-constraints {traffic-engineering-multicast}?
      |     |     +--rw constraints* [constraint-id]
      |     |        +--rw constraint-id      svc-id
      |     |        +--rw src-site?          svc-id
      |     |        +--rw dst-site?          svc-id
      |     |        +--rw constraint-list* [constraint-type]
      |     |           +--rw constraint-type            identityref
      |     |           +--rw constraint-opaque-value?   string
      |     +--rw extranet-vpns {extranet-vpn}?
      |        +--rw extranet-vpn* [vpn-id]
      |           +--rw vpn-id              svc-id
      |           +--rw local-sites-role?   identityref
      +--rw sites
      |  +--rw site* [site-id]
      |     +--rw site-id                  svc-id
      |     +--rw apply-template?          leafref
      |     +--rw requested-site-start?    yang:date-and-time
      |     +--rw requested-site-stop?     yang:date-and-time
      |     +--rw actual-site-start?       yang:date-and-time
      |     +--rw actual-site-stop?        yang:date-and-time
      |     +--rw location
      |     |  +--rw address?        string
      |     |  +--rw zip-code?       string
      |     |  +--rw state?          string
      |     |  +--rw city?           string
      |     |  +--rw country-code?   string
      |     +--rw site-diversity {site-diversity}?
      |     |  +--rw type?         placement-diversity

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      |     |  +--rw site-group*   uint32
      |     +--rw management
      |     |  +--rw type?                   identityref
      |     |  +--rw management-transport?   identityref
      |     |  +--rw address?                inet:ip-address
      |     +--rw vpn-policy-list
      |     |  +--rw vpn-policy* [vpn-policy-id]
      |     |     +--rw vpn-policy-id    svc-id
      |     |     +--rw entries* [id]
      |     |        +--rw id        svc-id
      |     |        +--rw filter
      |     |        |  +--rw (lan)?
      |     |        |     +--:(lan-prefix)
      |     |        |     |  +--rw lan-prefixes
      |     |        |     |     +--rw ipv4-lan-prefixes* [lan] {ipv4}?
      |     |        |     |     |  +--rw lan    inet:ipv4-prefix
      |     |        |     |     +--rw ipv6-lan-prefixes* [lan] {ipv6}?
      |     |        |     |        +--rw lan    inet:ipv6-prefix
      |     |        |     +--:(lan-tag)
      |     |        |        +--rw lan-tag*        string
      |     |        +--rw vpn
      |     |           +--rw vpn-id       leafref
      |     |           +--rw site-role    identityref
      |     +--rw site-vpn-flavor?         identityref
      |     +--rw maximum-routes
      |     |  +--rw address-family* [af]
      |     |     +--rw af                identityref
      |     |     +--rw maximum-routes?   uint32
      |     +--rw security
      |     |  +--rw authentication
      |     |  +--rw encryption {encryption}?
      |     |     +--rw enabled?              boolean
      |     |     +--rw layer?                enumeration
      |     |     +--rw encryption-profile
      |     |        +--rw (profile)?
      |     |           +--:(provider-profile)
      |     |           |  +--rw profile-name?    string
      |     |           +--:(customer-profile)
      |     |              +--rw algorithm?       string
      |     |              +--rw (key-type)?
      |     |                 +--:(psk)
      |     |                 |  +--rw preshared-key?   string
      |     |                 +--:(pki)
      |     +--rw service
      |     |  +--rw svc-input-bandwidth?    uint32
      |     |  +--rw svc-output-bandwidth?   uint32
      |     |  +--rw svc-mtu?                uint16
      |     |  +--rw qos {qos}?

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      |     |  |  +--rw qos-classification-policy
      |     |  |  |  +--rw rules* [id]
      |     |  |  |     +--rw id                 uint16
      |     |  |  |     +--rw (match-type)?
      |     |  |  |     |  +--:(flow)
      |     |  |  |     |  |  +--rw match-flow
      |     |  |  |     |  |     +--rw dscp?              uint8
      |     |  |  |     |  |     +--rw tos?               uint8
      |     |  |  |     |  |     +--rw dot1p?             uint8
      |     |  |  |     |  |     +--rw ipv4-src-prefix?   inet:ipv4-prefix
      |     |  |  |     |  |     +--rw ipv6-src-prefix?   inet:ipv6-prefix
      |     |  |  |     |  |     +--rw ipv4-dst-prefix?   inet:ipv4-prefix
      |     |  |  |     |  |     +--rw ipv6-dst-prefix?   inet:ipv6-prefix
      |     |  |  |     |  |     +--rw l4-src-port?       uint16
      |     |  |  |     |  |     +--rw l4-dst-port?       uint16
      |     |  |  |     |  |     +--rw protocol-field?    union
      |     |  |  |     |  +--:(match-application)
      |     |  |  |     |     +--rw application?       identityref
      |     |  |  |     +--rw target-class-id?   string
      |     |  |  +--rw qos-profile
      |     |  |     +--rw (qos-profile)?
      |     |  |        +--:(standard)
      |     |  |        |  +--rw profile?   string
      |     |  |        +--:(custom)
      |     |  |           +--rw classes {qos-custom}?
      |     |  |              +--rw class* [class-id]
      |     |  |                 +--rw class-id                 string
      |     |  |                 +--rw rate-limit?              uint8
      |     |  |                 +--rw priority-level?          uint8
      |     |  |                 +--rw guaranteed-bw-percent?   uint8
      |     |  +--rw carrierscarrier {carrierscarrier}?
      |     |  |  +--rw signalling-type?   enumeration
      |     |  +--rw multicast {multicast}?
      |     |     +--rw multicast-site-type?            enumeration
      |     |     +--rw multicast-transport-protocol
      |     |     |  +--rw ipv4?   boolean {ipv4}?
      |     |     |  +--rw ipv6?   boolean {ipv6}?
      |     |     +--rw protocol-type?                  enumeration
      |     +--rw routing-protocols
      |     |  +--rw routing-protocol* [type]
      |     |     +--rw type      identityref
      |     |     +--rw ospf {rtg-ospf}?
      |     |     |  +--rw address-family*   identityref
      |     |     |  +--rw area-address?     yang:dotted-quad
      |     |     |  +--rw metric?           uint16
      |     |     |  +--rw sham-links {rtg-ospf-sham-link}?
      |     |     |     +--rw sham-link* [target-site]
      |     |     |        +--rw target-site    svc-id

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      |     |     |        +--rw metric?        uint16
      |     |     +--rw bgp {rtg-bgp}?
      |     |     |  +--rw autonomous-system?   uint32
      |     |     |  +--rw address-family*      identityref
      |     |     +--rw static
      |     |     |  +--rw cascaded-lan-prefixes
      |     |     |     +--rw ipv4-lan-prefixes* [lan next-hop] {ipv4}?
      |     |     |     |  +--rw lan         inet:ipv4-prefix
      |     |     |     |  +--rw lan-tag?    string
      |     |     |     |  +--rw next-hop    inet:ipv4-address
      |     |     |     +--rw ipv6-lan-prefixes* [lan next-hop] {ipv6}?
      |     |     |        +--rw lan         inet:ipv6-prefix
      |     |     |        +--rw lan-tag?    string
      |     |     |        +--rw next-hop    inet:ipv6-address
      |     |     +--rw rip {rtg-rip}?
      |     |     |  +--rw address-family*   identityref
      |     |     +--rw vrrp {rtg-vrrp}?
      |     |        +--rw address-family*   identityref
      |     +--rw site-network-accesses
      |        +--rw site-network-access* [site-network-access-id]
      |           +--rw site-network-access-id    svc-id
      |           +--rw apply-template?           leafref
      |           +--rw access-diversity {site-diversity}?
      |           |  +--rw type?   placement-diversity
      |           +--rw bearer
      |           |  +--rw requested-type {requested-type}?
      |           |  |  +--rw requested-type?   string
      |           |  |  +--rw strict?           boolean
      |           |  +--rw always-on?          boolean {always-on}?
      |           |  +--rw bearer-reference?   string {bearer-reference}?
      |           +--rw ip-connection
      |           |  +--rw ipv4 {ipv4}?
      |           |  |  +--rw address-allocation-type?   identityref
      |           |  |  +--rw addresses
      |           |  |     +--rw provider-address?   inet:ipv4-address
      |           |  |     +--rw customer-address?   inet:ipv4-address
      |           |  |     +--rw mask?               uint8
      |           |  +--rw ipv6 {ipv6}?
      |           |  |  +--rw address-allocation-type?   identityref
      |           |  |  +--rw addresses
      |           |  |     +--rw provider-address?   inet:ipv6-address
      |           |  |     +--rw customer-address?   inet:ipv6-address
      |           |  |     +--rw mask?               uint8
      |           |  +--rw oam
      |           |     +--rw bfd {bfd}?
      |           |        +--rw bfd-enabled?    boolean
      |           |        +--rw (holdtime)?
      |           |           +--:(profile)

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      |           |           |  +--rw profile-name?   string
      |           |           +--:(fixed)
      |           |              +--rw fixed-value?    uint32
      |           +--rw security
      |           |  +--rw authentication
      |           |  +--rw encryption {encryption}?
      |           |     +--rw enabled?              boolean
      |           |     +--rw layer?                enumeration
      |           |     +--rw encryption-profile
      |           |        +--rw (profile)?
      |           |           +--:(provider-profile)
      |           |           |  +--rw profile-name?    string
      |           |           +--:(customer-profile)
      |           |              +--rw algorithm?       string
      |           |              +--rw (key-type)?
      |           |                 +--:(psk)
      |           |                 |     ...
      |           |                 +--:(pki)
      |           +--rw service
      |           |  +--rw svc-input-bandwidth?    uint32
      |           |  +--rw svc-output-bandwidth?   uint32
      |           |  +--rw svc-mtu?                uint16
      |           |  +--rw qos {qos}?
      |           |  |  +--rw qos-classification-policy
      |           |  |  |  +--rw rules* [id]
      |           |  |  |     +--rw id                 uint16
      |           |  |  |     +--rw (match-type)?
      |           |  |  |     |  +--:(flow)
      |           |  |  |     |  |  +--rw match-flow
      |           |  |  |     |  |        ...
      |           |  |  |     |  +--:(match-application)
      |           |  |  |     |     +--rw application?       identityref
      |           |  |  |     +--rw target-class-id?   string
      |           |  |  +--rw qos-profile
      |           |  |     +--rw (qos-profile)?
      |           |  |        +--:(standard)
      |           |  |        |  +--rw profile?   string
      |           |  |        +--:(custom)
      |           |  |           +--rw classes {qos-custom}?
      |           |  |              +--rw class* [class-id]
      |           |  |                    ...
      |           |  +--rw carrierscarrier {carrierscarrier}?
      |           |  |  +--rw signalling-type?   enumeration
      |           |  +--rw multicast {multicast}?
      |           |     +--rw multicast-site-type?            enumeration
      |           |     +--rw multicast-transport-protocol
      |           |     |  +--rw ipv4?   boolean {ipv4}?
      |           |     |  +--rw ipv6?   boolean {ipv6}?

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      |           |     +--rw protocol-type?                  enumeration
      |           +--rw routing-protocols
      |           |  +--rw routing-protocol* [type]
      |           |     +--rw type      identityref
      |           |     +--rw ospf {rtg-ospf}?
      |           |     |  +--rw address-family*   identityref
      |           |     |  +--rw area-address?     yang:dotted-quad
      |           |     |  +--rw metric?           uint16
      |           |     |  +--rw sham-links {rtg-ospf-sham-link}?
      |           |     |     +--rw sham-link* [target-site]
      |           |     |        +--rw target-site    svc-id
      |           |     |        +--rw metric?        uint16
      |           |     +--rw bgp {rtg-bgp}?
      |           |     |  +--rw autonomous-system?   uint32
      |           |     |  +--rw address-family*      identityref
      |           |     +--rw static
      |           |     |  +--rw cascaded-lan-prefixes
      |           |     |     +--rw ipv4-lan-prefixes* [lan next-hop] {ipv4}?
      |           |     |     |  +--rw lan         inet:ipv4-prefix
      |           |     |     |  +--rw lan-tag?    string
      |           |     |     |  +--rw next-hop    inet:ipv4-address
      |           |     |     +--rw ipv6-lan-prefixes* [lan next-hop] {ipv6}?
      |           |     |        +--rw lan         inet:ipv6-prefix
      |           |     |        +--rw lan-tag?    string
      |           |     |        +--rw next-hop    inet:ipv6-address
      |           |     +--rw rip {rtg-rip}?
      |           |     |  +--rw address-family*   identityref
      |           |     +--rw vrrp {rtg-vrrp}?
      |           |        +--rw address-family*   identityref
      |           +--rw availability
      |           |  +--rw traffic-protection {fast-reroute}?
      |           |  |  +--rw enabled?   boolean
      |           |  +--rw access-priority?      uint32
      |           +--rw vpn-attachment
      |              +--rw (attachment-flavor)
      |                 +--:(vpn-policy-id)
      |                 |  +--rw vpn-policy-id?   leafref
      |                 +--:(vpn-id)
      |                    +--rw vpn-id?          leafref
      |                    +--rw site-role        identityref
      +--rw site-templates
         +--rw site-template* [site-template-id]
            +--rw site-template-id        template-id
            +--rw requested-site-start?   yang:date-and-time
            +--rw requested-site-stop?    yang:date-and-time
            +--rw actual-site-start?      yang:date-and-time
            +--rw actual-site-stop?       yang:date-and-time
            +--rw location

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            |  +--rw address?        string
            |  +--rw zip-code?       string
            |  +--rw state?          string
            |  +--rw city?           string
            |  +--rw country-code?   string
            +--rw site-diversity {site-diversity}?
            |  +--rw type?         placement-diversity
            |  +--rw site-group*   uint32
            +--rw management
            |  +--rw type?                   identityref
            |  +--rw management-transport?   identityref
            |  +--rw address?                inet:ip-address
            +--rw vpn-policy-list
            |  +--rw vpn-policy* [vpn-policy-id]
            |     +--rw vpn-policy-id    svc-id
            |     +--rw entries* [id]
            |        +--rw id        svc-id
            |        +--rw filter
            |        |  +--rw (lan)?
            |        |     +--:(lan-prefix)
            |        |     |  +--rw lan-prefixes
            |        |     |     +--rw ipv4-lan-prefixes* [lan] {ipv4}?
            |        |     |     |  +--rw lan    inet:ipv4-prefix
            |        |     |     +--rw ipv6-lan-prefixes* [lan] {ipv6}?
            |        |     |        +--rw lan    inet:ipv6-prefix
            |        |     +--:(lan-tag)
            |        |        +--rw lan-tag*        string
            |        +--rw vpn
            |           +--rw vpn-id       leafref
            |           +--rw site-role    identityref
            +--rw site-vpn-flavor?        identityref
            +--rw maximum-routes
            |  +--rw address-family* [af]
            |     +--rw af                identityref
            |     +--rw maximum-routes?   uint32
            +--rw security
            |  +--rw authentication
            |  +--rw encryption {encryption}?
            |     +--rw enabled?              boolean
            |     +--rw layer?                enumeration
            |     +--rw encryption-profile
            |        +--rw (profile)?
            |           +--:(provider-profile)
            |           |  +--rw profile-name?    string
            |           +--:(customer-profile)
            |              +--rw algorithm?       string
            |              +--rw (key-type)?
            |                 +--:(psk)

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            |                 |  +--rw preshared-key?   string
            |                 +--:(pki)
            +--rw service
            |  +--rw svc-input-bandwidth?    uint32
            |  +--rw svc-output-bandwidth?   uint32
            |  +--rw svc-mtu?                uint16
            |  +--rw qos {qos}?
            |  |  +--rw qos-classification-policy
            |  |  |  +--rw rules* [id]
            |  |  |     +--rw id                 uint16
            |  |  |     +--rw (match-type)?
            |  |  |     |  +--:(flow)
            |  |  |     |  |  +--rw match-flow
            |  |  |     |  |     +--rw dscp?              uint8
            |  |  |     |  |     +--rw tos?               uint8
            |  |  |     |  |     +--rw dot1p?             uint8
            |  |  |     |  |     +--rw ipv4-src-prefix?   inet:ipv4-prefix
            |  |  |     |  |     +--rw ipv6-src-prefix?   inet:ipv6-prefix
            |  |  |     |  |     +--rw ipv4-dst-prefix?   inet:ipv4-prefix
            |  |  |     |  |     +--rw ipv6-dst-prefix?   inet:ipv6-prefix
            |  |  |     |  |     +--rw l4-src-port?       uint16
            |  |  |     |  |     +--rw l4-dst-port?       uint16
            |  |  |     |  |     +--rw protocol-field?    union
            |  |  |     |  +--:(match-application)
            |  |  |     |     +--rw application?       identityref
            |  |  |     +--rw target-class-id?   string
            |  |  +--rw qos-profile
            |  |     +--rw (qos-profile)?
            |  |        +--:(standard)
            |  |        |  +--rw profile?   string
            |  |        +--:(custom)
            |  |           +--rw classes {qos-custom}?
            |  |              +--rw class* [class-id]
            |  |                 +--rw class-id                 string
            |  |                 +--rw rate-limit?              uint8
            |  |                 +--rw priority-level?          uint8
            |  |                 +--rw guaranteed-bw-percent?   uint8
            |  +--rw carrierscarrier {carrierscarrier}?
            |  |  +--rw signalling-type?   enumeration
            |  +--rw multicast {multicast}?
            |     +--rw multicast-site-type?            enumeration
            |     +--rw multicast-transport-protocol
            |     |  +--rw ipv4?   boolean {ipv4}?
            |     |  +--rw ipv6?   boolean {ipv6}?
            |     +--rw protocol-type?                  enumeration
            +--rw routing-protocols
            |  +--rw routing-protocol* [type]
            |     +--rw type      identityref

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            |     +--rw ospf {rtg-ospf}?
            |     |  +--rw address-family*   identityref
            |     |  +--rw area-address?     yang:dotted-quad
            |     |  +--rw metric?           uint16
            |     |  +--rw sham-links {rtg-ospf-sham-link}?
            |     |     +--rw sham-link* [target-site]
            |     |        +--rw target-site    svc-id
            |     |        +--rw metric?        uint16
            |     +--rw bgp {rtg-bgp}?
            |     |  +--rw autonomous-system?   uint32
            |     |  +--rw address-family*      identityref
            |     +--rw static
            |     |  +--rw cascaded-lan-prefixes
            |     |     +--rw ipv4-lan-prefixes* [lan next-hop] {ipv4}?
            |     |     |  +--rw lan         inet:ipv4-prefix
            |     |     |  +--rw lan-tag?    string
            |     |     |  +--rw next-hop    inet:ipv4-address
            |     |     +--rw ipv6-lan-prefixes* [lan next-hop] {ipv6}?
            |     |        +--rw lan         inet:ipv6-prefix
            |     |        +--rw lan-tag?    string
            |     |        +--rw next-hop    inet:ipv6-address
            |     +--rw rip {rtg-rip}?
            |     |  +--rw address-family*   identityref
            |     +--rw vrrp {rtg-vrrp}?
            |        +--rw address-family*   identityref
            +--rw site-network-access
               +--rw access-diversity {site-diversity}?
               |  +--rw type?   placement-diversity
               +--rw bearer
               |  +--rw requested-type {requested-type}?
               |  |  +--rw requested-type?   string
               |  |  +--rw strict?           boolean
               |  +--rw always-on?          boolean {always-on}?
               |  +--rw bearer-reference?   string {bearer-reference}?
               +--rw ip-connection
               |  +--rw ipv4 {ipv4}?
               |  |  +--rw address-allocation-type?   identityref
               |  |  +--rw addresses
               |  |     +--rw provider-address?   inet:ipv4-address
               |  |     +--rw customer-address?   inet:ipv4-address
               |  |     +--rw mask?               uint8
               |  +--rw ipv6 {ipv6}?
               |  |  +--rw address-allocation-type?   identityref
               |  |  +--rw addresses
               |  |     +--rw provider-address?   inet:ipv6-address
               |  |     +--rw customer-address?   inet:ipv6-address
               |  |     +--rw mask?               uint8
               |  +--rw oam

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               |     +--rw bfd {bfd}?
               |        +--rw bfd-enabled?    boolean
               |        +--rw (holdtime)?
               |           +--:(profile)
               |           |  +--rw profile-name?   string
               |           +--:(fixed)
               |              +--rw fixed-value?    uint32
               +--rw security
               |  +--rw authentication
               |  +--rw encryption {encryption}?
               |     +--rw enabled?              boolean
               |     +--rw layer?                enumeration
               |     +--rw encryption-profile
               |        +--rw (profile)?
               |           +--:(provider-profile)
               |           |  +--rw profile-name?    string
               |           +--:(customer-profile)
               |              +--rw algorithm?       string
               |              +--rw (key-type)?
               |                 +--:(psk)
               |                 |  +--rw preshared-key?   string
               |                 +--:(pki)
               +--rw service
               |  +--rw svc-input-bandwidth?    uint32
               |  +--rw svc-output-bandwidth?   uint32
               |  +--rw svc-mtu?                uint16
               |  +--rw qos {qos}?
               |  |  +--rw qos-classification-policy
               |  |  |  +--rw rules* [id]
               |  |  |     +--rw id                 uint16
               |  |  |     +--rw (match-type)?
               |  |  |     |  +--:(flow)
               |  |  |     |  |  +--rw match-flow
               |  |  |     |  |     +--rw dscp?              uint8
               |  |  |     |  |     +--rw tos?               uint8
               |  |  |     |  |     +--rw dot1p?             uint8
               |  |  |     |  |     +--rw ipv4-src-prefix?   inet:ipv4-prefix
               |  |  |     |  |     +--rw ipv6-src-prefix?   inet:ipv6-prefix
               |  |  |     |  |     +--rw ipv4-dst-prefix?   inet:ipv4-prefix
               |  |  |     |  |     +--rw ipv6-dst-prefix?   inet:ipv6-prefix
               |  |  |     |  |     +--rw l4-src-port?       uint16
               |  |  |     |  |     +--rw l4-dst-port?       uint16
               |  |  |     |  |     +--rw protocol-field?    union
               |  |  |     |  +--:(match-application)
               |  |  |     |     +--rw application?       identityref
               |  |  |     +--rw target-class-id?   string
               |  |  +--rw qos-profile
               |  |     +--rw (qos-profile)?

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               |  |        +--:(standard)
               |  |        |  +--rw profile?   string
               |  |        +--:(custom)
               |  |           +--rw classes {qos-custom}?
               |  |              +--rw class* [class-id]
               |  |                 +--rw class-id                 string
               |  |                 +--rw rate-limit?              uint8
               |  |                 +--rw priority-level?          uint8
               |  |                 +--rw guaranteed-bw-percent?   uint8
               |  +--rw carrierscarrier {carrierscarrier}?
               |  |  +--rw signalling-type?   enumeration
               |  +--rw multicast {multicast}?
               |     +--rw multicast-site-type?            enumeration
               |     +--rw multicast-transport-protocol
               |     |  +--rw ipv4?   boolean {ipv4}?
               |     |  +--rw ipv6?   boolean {ipv6}?
               |     +--rw protocol-type?                  enumeration
               +--rw routing-protocols
               |  +--rw routing-protocol* [type]
               |     +--rw type      identityref
               |     +--rw ospf {rtg-ospf}?
               |     |  +--rw address-family*   identityref
               |     |  +--rw area-address?     yang:dotted-quad
               |     |  +--rw metric?           uint16
               |     |  +--rw sham-links {rtg-ospf-sham-link}?
               |     |     +--rw sham-link* [target-site]
               |     |        +--rw target-site    svc-id
               |     |        +--rw metric?        uint16
               |     +--rw bgp {rtg-bgp}?
               |     |  +--rw autonomous-system?   uint32
               |     |  +--rw address-family*      identityref
               |     +--rw static
               |     |  +--rw cascaded-lan-prefixes
               |     |     +--rw ipv4-lan-prefixes* [lan next-hop] {ipv4}?
               |     |     |  +--rw lan         inet:ipv4-prefix
               |     |     |  +--rw lan-tag?    string
               |     |     |  +--rw next-hop    inet:ipv4-address
               |     |     +--rw ipv6-lan-prefixes* [lan next-hop] {ipv6}?
               |     |        +--rw lan         inet:ipv6-prefix
               |     |        +--rw lan-tag?    string
               |     |        +--rw next-hop    inet:ipv6-address
               |     +--rw rip {rtg-rip}?
               |     |  +--rw address-family*   identityref
               |     +--rw vrrp {rtg-vrrp}?
               |        +--rw address-family*   identityref
               +--rw availability
               |  +--rw traffic-protection {fast-reroute}?
               |  |  +--rw enabled?   boolean

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               |  +--rw access-priority?      uint32
               +--rw vpn-attachment
                  +--rw (attachment-flavor)
                     +--:(vpn-policy-id)
                     |  +--rw vpn-policy-id?   leafref
                     +--:(vpn-id)
                        +--rw vpn-id?          leafref
                        +--rw site-role        identityref

5.1.  VPN service overview

   The vpn-svc container contains generic information about the VPN
   service.  The vpn-id of the vpn-svc refers to an internal reference
   for this VPN service, while customer name refers to a more explicit
   reference to the customer.  This identifier is purely internal to the
   organization responsible for the VPN service.  The vpn-id MUST be
   unique.

5.1.1.  VPN service topology

   The type of topology of the VPN is required for configuration.
   Current proposal supports : any-to-any, hub and spoke (where hubs can
   exchange traffic), and hub and spoke disjoint (where hubs cannot
   exchange traffic).  New topologies could be added by augmentation.
   By default, any-to-any topology is used.

5.1.1.1.  Route Target allocation

   Layer 3 PE-based VPN is built using route-targets as described in
   [RFC4364].  It is expected management system to allocate
   automatically set of route-targets upon a VPN service creation
   request.  How management system allocates route-targets is out of
   scope of the document but multiple ways could be envisaged as
   described below.

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                                    Management system
                     <------------------------------------------------->
                                                 Request RT
                      +-----------------------+  Topo a2a   +----------+
           RestConf   |                       |  ----->     |          |
   User ------------- | Service Orchestration |             |NetworkOSS|
           l3vpn-svc  |                       |  <-----     |          |
             model    +-----------------------+   Response  +----------+
                                                  RT1,RT2

   In the example above, a service orchestration, owning the
   instantiation of this service model, request route-targets to the
   network OSS.  Based on the requested VPN topology, the network OSS
   replies with one or multiple route-targets.  The interface between
   this service orchestration and network OSS is out of scope of this
   document.

                      +---------------------------+
           RestConf   |                           |
   User ------------- |   Service Orchestration   |
           l3vpn-svc  |                           |
            model     |                           |
                      |  RT pool : 10:1->10:10000 |
                      |  RT pool : 20:50->20:5000 |
                      +---------------------------+

   In the example above, a service orchestration, owning the
   instantiation of this service model, owns one or more pools of route-
   target (filled by service provider) that can be allocated.  Based on
   the requested VPN topology, it will allocate one or multiple route-
   targets from the pool.

   The mechanism displayed above are just examples and SHOULD NOT be
   considered as exhaustive list of solutions.

5.1.1.2.  Any to any

   +------------------------------------------------------------+
   |  VPN1_Site1 ------ PE1               PE2 ------ VPN1_Site2 |
   |                                                            |
   |  VPN1_Site3 ------ PE3               PE4 ------ VPN1_Site4 |
   +------------------------------------------------------------+

               Figure - Any to any VPN topology

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   In the any to any topology, all VPN sites can discuss between each
   other without any restriction.  It is expected that the management
   system that owns a any to any IPVPN service request through this
   model, needs to assign and then configure the VRF and route-targets
   on the appropriate PEs.  In case of any to any, in general a single
   route-target is required and every VRF imports and exports this
   route-target.

5.1.1.3.  Hub and Spoke

   +-------------------------------------------------------------+
   |   Hub_Site1 ------ PE1               PE2 ------ Spoke_Site1 |
   |                          +----------------------------------+
   |                          |
   |                          +----------------------------------+
   |   Hub_Site2 ------ PE3               PE4 ------ Spoke_Site2 |
   +-------------------------------------------------------------+

               Figure - Hub and Spoke VPN topology

   In the hub and spoke topology, all spoke sites can discuss only with
   Hub sites but not between each other.  Hubs can discuss also between
   each other.  It is expected that the management system that owns a
   any to any IPVPN service request through this model, needs to assign
   and then configure the VRF and route-targets on the appropriate PEs.
   In case of hub and spoke, in general a two route-targets are required
   (one route-target for Hub routes, one route-target for spoke routes).
   A Hub VRF, connecting Hub sites, will export Hub routes with Hub
   route-target, and will import Spoke routes through Spoke route-
   target.  It will also import the Hub route-target to allow Hub to Hub
   communication.  A Spoke VRF, connecting Spoke sites, will export
   Spoke routes with Spoke route-target, and will import Hub routes
   through Hub route-target.

   The management system MUST take into account Hub and Spoke
   connections constraints.  For example, if management system decides
   to mesh a spoke site and a hub site on the same PE, it needs to mesh
   connections in different VRFs as displayed in the figure below.

      Hub_Site ------- (VRF_Hub)  PE1
                                 (VRF_Spoke)
                                   /  |
   Spoke_Site1 -------------------+   |
                                      |
   Spoke_Site2 -----------------------+

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5.1.1.4.  Hub and Spoke disjoint

   +-------------------------------------------------------------+
   |   Hub_Site1 ------ PE1               PE2 ------ Spoke_Site1 |
   +--------------------------+  +-------------------------------+
                              |  |
   +--------------------------+  +-------------------------------+
   |   Hub_Site2 ------ PE3               PE4 ------ Spoke_Site2 |
   +-------------------------------------------------------------+

             Figure - Hub and Spoke disjoint VPN topology

   In the hub and spoke disjoint topology, all spoke sites can discuss
   only with Hub sites but not between each other.  Hubs cannot discuss
   between each other.  It is expected that the management system that
   owns a any to any IPVPN service request through this model, needs to
   assign and then configure the VRF and route-targets on the
   appropriate PEs.  In case of hub and spoke, in general a two route-
   targets are required (one route-target for Hub routes, one route-
   target for spoke routes).  A Hub VRF, connecting Hub sites, will
   export Hub routes with Hub route-target, and will import Spoke routes
   through Spoke route-target.  A Spoke VRF, connecting Spoke sites,
   will export Spoke routes with Spoke route-target, and will import Hub
   routes through Hub route-target.

   The management system MUST take into account Hub and Spoke
   connections constraints as in the previous case.

5.1.2.  Cloud access

   The proposed model provides cloud access configuration through the
   cloud-access container.  Internet access can typically be considered
   as a public cloud access service.  The cloud-access container
   provides parameters for network address translation and authorization
   rules.

   A cloud identifier is used to reference the target service.  This
   identifier is local to each administration.

   If NAT is required to access to the cloud, the nat-enabled leaf MUST
   be set to true.  A NAT address may be provided in customer-nat-
   address, in case the customer is providing the public IP address for
   the cloud access.  If service provider is providing the NAT address,
   customer-nat-address is not necessary as it can be picked from a
   service provider pool.

   By default, all sites in the IPVPN MUST be authorized to access to
   the cloud.  In case restrictions are required, a user MAY configure

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   the authorized-sites and denied-sites list.  The authorization-sites
   defines the list of sites authorized for cloud access.  The denied-
   sites defines the list of sites denied for cloud access.  The model
   supports both "deny all expect" and "accept all expect"
   authorization.

   The "deny all expect" behavior is obtained by filling only the
   authorized-sites.  All the sites listed will be authorized, all
   others will be denied.

   The "accept all expect" behavior is obtained by filling only the
   denied-sites.  All the sites listed will be denied, all others will
   be authorized.

   Defining both denied-sites and authorized-sites MUST be processed as
   "deny all expect", so the denied-sites will have not effect.

   How the restrictions will be configured on network elements is out of
   scope of this document and will be specific to each deployment.

                     IPVPN
       ++++++++++++++++++++++++++++++++     +++++++++++
       +             Site 3           + --- +  Cloud1 +
       + Site 1                       +     +++++++++++
       +                              +
       + Site 2                       + --- ++++++++++++
       +                              +     + Internet +
       +            Site 4            +     ++++++++++++
       ++++++++++++++++++++++++++++++++
                    |
                ++++++++++
                + Cloud2 +
                ++++++++++

   In the example above, we may configure the global VPN to access
   Internet by creating a cloud-access pointing to the cloud identifier
   for Internet service.  No authorized-sites will be configured as all
   sites are required to access to Internet.  NAT-enabled will be set to
   true and a nat-address will be configured.

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   <vpn-svc>
       <vpn-id>ZKITYHJ054687</vpn-id>
       <customer-name>CUSTOMER_1</customer-name>
       <topology>any-to-any</topology>
       <cloud-access>
           <cloud-identifier>51</cloud-identifier>
           <nat-enabled>true</nat-enabled>
       </cloud-access>
   </vpn-svc>

   If Site1 and Site2 requires access to Cloud1, a new cloud-access will
   be created pointing to the cloud identifier of Cloud1.  Authorized
   sites will be filled with reference to Site1 and Site2.

   <vpn-svc>
       <vpn-id>12456487</vpn-id>
       <customer-name>CUSTOMER_1</customer-name>
       <topology>any-to-any</topology>
       <cloud-access>
           <cloud-identifier>1111111</cloud-identifier>
           <authorized-sites>
               <site-id>site1</site-id>
               <site-id>site2</site-id>
           </authorized-sites>
       </cloud-access>
   </vpn-svc>

   If all sites except Site1 requires access to Cloud2, a new cloud-
   access will be created pointing to the cloud identifier of Cloud2.
   denied-sites will be filled with reference to Site1.

   <vpn-svc>
       <vpn-id>12456487</vpn-id>
       <customer-name>CUSTOMER_1</customer-name>
       <topology>any-to-any</topology>
       <cloud-access>
           <cloud-identifier>22222222</cloud-identifier>
           <denied-sites>
               <site-id>site1</site-id>
           </denied-sites>
       </cloud-access>
   </vpn-svc>

5.1.3.  Multicast service

   Multicast in IP VPN is described in [RFC6513].

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   If IPVPN supports multicast service, it is expected to provide inputs
   on global multicast parameters.

   The user of this model will need to fill the flavor of trees that
   will be used by customer within the IPVPN (Customer tree).  The
   proposed model supports ASM, SSM and BiDirectional trees (and can be
   augmented).  Multiple flavors of tree can be supported
   simultaneously.

                          (SSM tree)
    Recv (IGMPv3) -- Site2 ------- PE2
                                              PE1 --- Site1 --- Source1
                                                            \
                                                             -- Source2

                           (ASM tree)
    Recv (IGMPv2) -- Site3 ------- PE3

                           (SSM tree)
    Recv (IGMPv3) -- Site4 ------- PE4
                                   /
    Recv (IGMPv2) -- Site5 --------
                           (ASM tree)

   In case of ASM flavor requested, this model requires to fill the rp
   and rp-discovery parameters.  Multiple RP to group mappings can be
   created using the rp-group-mappings container.  For each mapping, the
   RP service can be managed by the service provider using the leaf
   provider-managed/enabled set to true.  In case of provider managed
   RP, user can request for rendez-vous point redundancy and/or optimal
   traffic delivery.  Those parameters will help the service provider to
   select the appropriate technology to fulfill the customer service
   requirement : for instance, in case of request of optimal traffic
   delivery, service provider may decide to use Anycast-RP or RP-tree to
   SPT switchover.

   In case of customer managed RP, the RP address must be filled in the
   RP to group mappings using the "rp-address" leaf.  This leaf is not
   needed for provider managed RP.

   User can define a specific rp-discovery mechanism like : auto-rp,
   static-rp, bsr-rp modes.  By default, model considers static-rp if
   ASM is requested.  A single rp-discovery mechanism is allowed for the
   VPN.  "rp-discovery" can be used for provider and customer managed
   RPs.  In case of provider managed RP, if the user wants to use bsr-rp
   as discovery protocol, service provider will consider the provider
   managed rp-group-mappings for bsr-rp.  The service provider will so

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   configure its selected RPs to be bsr-rp-candidates.  In case of
   customer managed RP and bsr-rp discovery mechanism, the rp-address
   provided will be considered as bsr-rp candidate.

5.1.4.  Extranet VPNs

   There are some cases where a particular VPN needs to access to
   resources that are external.  The resources may be located in another
   VPN.

               +-----------+              +-----------+
              /             \            /             \
   SiteA --  |   VPN A       |   ---    |    VPN B      | --- SiteB
              \             /            \             / (Shared
               +-----------+              +-----------+   resources)

   In the figure above, VPN B has some resources on Site B that need to
   be available to some customers/partners.  VPN A must be able to
   access those VPN B resources.

   Such VPN connection scenario can be achieved by the VPN policy
   defined in Section 5.4.2.2.  But there are some simple cases, where a
   particular VPN (VPN A) needs to access to all resources in a VPN B.
   The model provides an easy way to setup this connection using the
   extranet-vpns container.

   The extranet-vpns container defines a list of VPNs, a particular VPN
   wants to access.  The extranet-vpns must be used on "customer" VPNs
   accessing extranet resources in another VPN.  In the figure above, in
   order to give access for VPN A to VPN B, extranet-vpns container will
   be configured under VPN A with an entry corresponding to VPN B and
   there is no service configuration requirement on VPN B.

   The site-role leaf defines the role of the local VPN sites in the
   target extranet VPN topology.  Site roles are defined in Section 5.3.
   Based on this, the requirements described in Section 5.3 regarding
   the site-role leaf are also applicable here.

   In the example below, VPN A accesses to VPN B resources through
   extranet connection, a spoke role is required for VPN A sites, so
   sites from VPN A must not be able to communicate between each other
   through the extranet VPN connection.

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   <vpn-svc>
       <vpn-id>VPNB</vpn-id>
       <topology>hub-spoke</topology>
   </vpn-svc>
   <vpn-svc>
       <vpn-id>VPNA</vpn-id>
       <topology>any-to-any</topology>
       <extranet-vpns>
           <extranet-vpn>
               <vpn-id>VPNB</vpn-id>
               <site-role>spoke-role</site-role>
           </extranet-vpn>
       </extranet-vpns>
   </vpn-svc>

   This model does not define how the extranet configuration will be
   achieved.

   Any more complex VPN connection topology (e.g. only part of sites of
   VPN A accessing only part of sites of VPN B) needs to be achieved
   using the vpn attachment defined in Section 5.4.2.

5.2.  Site overview

   A site represents a connection of a customer location to one or more
   VPN services.

                                                    +-------------+
                                                   /               \
     +------------------+                   +-----|      VPN1       |
     |                  |                   |      \               /
     |  New York Office | ----- (site) -----+       +-------------+
     |                  |                   |       +-------------+
     +------------------+                   |      /               \
                                            +-----|      VPN2       |
                                                   \               /
                                                    +-------------+

   A site is composed of some characteristics :

   o  Unique identifier (site-id) : to uniquely identify the site within
      the overall network infrastructure.  The identifier is a string
      allowing to any encoding for the local administration of the VPN
      service.

   o  Location (location) : site location informations to allow easy
      retrieval on nearest available resources.

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   o  Site constraints (site-diversity) : site-diversity container allow
      to define some constraints for the setup of the site, for example
      : PE disjointness or PoP disjointness.  A site-group identifier
      allow to manage the disjointness.  Two sites with the same group
      and requiring PE disjointness cannot be connected on the same PE.

   o  Management (management) : defines the model of management of the
      site, for example : co-managed, customer managed or provider
      managed.

   o  Site network accesses (site-network-accesses) : defines the list
      of network accesses associated to the sites and their properties :
      especially bearer, connection and service parameters.

   A site-network-access represents an IP logical connection of a site.
   A site may have multiple site-network-accesses.

     +------------------+             Site
     |                  |-----------------------------------
     |                  |****** (site-network-access#1) ******
     |  New York Office |
     |                  |****** (site-network-access#2) ******
     |                  |-----------------------------------
     +------------------+

   Multiple site-network-accesses are used for instance in case of
   multihoming.

   The site configuration is viewed as a global entity, we assume that
   it is mostly the role of the management to split the parameters
   between the different elements within the network.  For example, in
   the case of the site-network-access configuration, the management
   system needs to split the overall parameters between PE configuration
   and CE configuration.

5.2.1.  Site network accesses

   As mentioned, a site may be multihomed.  Each IP network access for a
   site is defined in the site-network-accesses list.  The site-network-
   access defines how the site is connected on the network and is
   splitted in three main classes of parameters :

   o  bearer : defines requirements of the attachment (below Layer 3).

   o  connection : defines Layer 3 protocol parameters of the
      attachment.

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   o  availability : defines the site availability policy.  Availability
      is defined in Section 5.5.3

   Some parameters from the site can be configured also at the site-
   network-access level like : routing, services, security ... Defining
   parameters only at site level will provide inheritance.  If a
   parameter is configured at both site and access level, the access
   level parameter MUST override the site level parameter.  Those
   parameters will be described later in the document.

5.2.1.1.  Bearer

   Bearer defines the requirements for the site attachment to the
   provider network that are below Layer 3.

   The bearer parameters will help to decide the access media to be
   used.  This is further described in Section 5.6.

5.2.1.2.  Connection

   The connection defines the protocol parameters of the attachment
   (IPv4 and IPv6).  Depending of the management mode, it refers to the
   PE-CE addressing or CE to customer LAN addressing.  In any case, it
   describes the provider to customer responsibility boundary.  For a
   customer managed site, it refers to the PE-CE connection.  For a
   provider managed site, it refers to the CE to LAN connection.

5.2.1.2.1.  IP addressing

   IP subnet can be configured for either transport protocols.  For a
   dual stack connection, two subnets will be provided, one for each
   transport layer.

   The address-allocation-type will help in defining how the address
   allocation MUST be done.  The current model proposes three ways of IP
   address allocation :

   o  provider-dhcp : the provider will provide DHCP service for
      customer equipments, this is applicable to both IPv4 and IPv6
      addressing.

   o  static-address : Addresses will be assigned manually on both
      sides, this is applicable to both IPv4 and IPv6 addressing.

   o  slaac : enables stateless address autoconfiguration ([RFC4862]).
      This is applicable only for IPv6.

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5.3.  Site role

   A VPN has a particular topology as described in Section 5.1.1.  As a
   consequence, each site belonging to a VPN as a particular role in
   this topology.  The site-role defines the role of the site in a
   particular VPN topology.

   In the any-to-any topology, all sites MUST have the same role which
   is any-to-any-role.

   In the hub-spoke or hub-spoke-disjoint topology, sites MUST have a
   hub-role or a spoke-role.

5.4.  Site belonging to multiple VPNs

5.4.1.  Site vpn flavor

   A site may be part of one or multiple VPNs.  The site flavor defines
   the way the VPN multiplexing is done.  The current version of the
   model only supports two flavors :

   o  site-vpn-flavor-single : the site belongs to only one VPN.

   o  site-vpn-flavor-multi : the site belongs to multiple VPNs and all
      the logical accesses of the sites belongs to the same set of VPNs.

   o  site-vpn-flavor-sub : the site belongs to multiple VPNs with
      multiple logical accesses.  Each logical access may map to
      different VPNs (one or many).

5.4.1.1.  Single VPN attachment : site-vpn-flavor-single

   The figure below describes the single VPN attachment.  The site
   connects to only one VPN.

                                                      +--------+
   +------------------+             Site             /          \
   |                  |-----------------------------|            |
   |                  |***(site-network-access#1)***|    VPN1    |
   |  New York Office |                             |            |
   |                  |***(site-network-access#2)***|            |
   |                  |-----------------------------|            |
   +------------------+                              \          /
                                                      +--------+

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5.4.1.2.  Multi VPN attachment : site-vpn-flavor-multi

   The figure below describes the multi VPN attachment.  The site
   connects to multiple VPNs.

                                                           +---------+
                                                      +---/----+      \
   +------------------+             Site             /   |      \      |
   |                  |--------------------------------- |       |VPNB |
   |                  |***(site-network-access#1)******* |       |     |
   |  New York Office |                             |    |       |     |
   |                  |***(site-network-access#2)*******  \      |    /
   |                  |-----------------------------| VPNA +-----|---+
   +------------------+                              \          /
                                                      +--------+

   In the example above, the New York office is multihomed, both logical
   accesses are using the same VPN attachment rules.  Both logical
   accesses are so connected to VPNA and VPNB.

5.4.1.3.  Sub VPN attachment : site-vpn-flavor-sub

   The figure below describes a sub VPN attachment.  The site connects
   to multiple VPNs but each logical access is attached to a particular
   set of VPN.  Typical use case of subVPN is a customer site used by
   multiple affiliates with private resources for each affiliates that
   cannot be shared (communication is prevented between the affiliates).
   It is similar than having separate sites instead that the customer
   wants to share some physical components while keeping strong
   isolation.  In the example, the access#1 is attached to VPNB while
   the access#2 is attached to VPNA.

   +------------------+         Site                      +--------+
   |                  |----------------------------------/          \
   |                  |****(site-network-access#1)******|    VPNB    |
   |  New York Office |                                  \          /
   |                  |                                   +--------+
   |                  |                                   +--------+
   |                  |                                  /          \
   |                  |****(site-network-access#2)******|    VPNA    |
   |                  |                                  \          /
   |                  |                                   +--------+
   |                  |-----------------------------------
   +------------------+

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   Multi-VPN can be implemented in addition to subVPN, as a consequence,
   each site-network-access can access to multiple VPNs.  In the example
   below, access#1 is mapped to VPNB and VPNC, while access#2 is mapped
   to VPNA and VPND.

  +------------------+         Site                      +-----+
  |                  |----------------------------------/      +----+
  |                  |****(site-network-access#1)******| VPNB /       \
  |  New York Office |                                  \     | VPN C  |
  |                  |                                   +----\       /
  |                  |                                         +-----+
  |                  |
  |                  |                                   +------+
  |                  |                                  /       +-----+
  |                  |****(site-network-access#2)******|  VPNA /       \
  |                  |                                  \      | VPN D |
  |                  |                                   +------\     /
  |                  |-----------------------------------        +---+
  +------------------+

   Multihoming is also possible with subVPN, in this case, site-network-
   accesses are grouped, and a particular group will access to the same
   set of VPN.  In the example below, access#1 and #2 are part of the
   same group (multihomed together) and will be mapped to VPN B and C,
   in addition access#3 and #4 are part of the same group (multihomed
   together) and will be mapped to VPN A and D.

  +------------------+         Site                      +-----+
  |                  |----------------------------------/      +----+
  |                  |****(site-network-access#1)******| VPNB /       \
  |  New York Office |****(site-network-access#2)******\     | VPN C  |
  |                  |                                   +----\       /
  |                  |                                         +-----+
  |                  |
  |                  |                                   +------+
  |                  |                                  /       +-----+
  |                  |****(site-network-access#3)******|  VPNA /       \
  |                  |****(site-network-access#4)****** \      | VPN D |
  |                  |                                   +------\     /
  |                  |-----------------------------------        +---+
  +------------------+

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5.4.2.  Attaching a site to a VPN

   Due to the multiple site vpn flavors, the attachment is done at the
   site-network-access (logical access) level through the vpn-attachment
   container.  The vpn-attachment container is mandatory.  The model
   provides two ways of attachment :

   o  Referencing directly the target VPN.

   o  Reference a VPN policy for more complex attachments.

   A choice is implemented to allow user to choose the best fitting
   flavor.

5.4.2.1.  Reference a VPN

   Referencing a vpn-id provides an easy way to attach a particular
   logical access to a VPN.  This is the best way in case of single VPN
   attachment or subVPN with single VPN attachment per logical access.
   When referencing a vpn-id, the site-role must be added to express the
   role of the site in the target VPN topology.

   <site>
    <site-id>SITE1</site-id>
    <site-network-accesses>
     <site-network-access>
      <site-network-access-id>LA1</site-network-access-id>
      <vpn-attachment>
       <vpn-id>VPNA</vpn-id>
       <site-role>spoke-role</site-role>
      </vpn-attachment>
     </site-network-access>
     <site-network-access-id>LA2</site-network-access-id>
      <vpn-attachment>
       <vpn-id>VPNB</vpn-id>
       <site-role>spoke-role</site-role>
      </vpn-attachment>
     </site-network-access>
    </site-network-accesses>
   </site>

   The example above describes a subVPN case where a site SITE1 has two
   logical accesses (LA1 and LA2) with LA1 attached to VPNA and LA2
   attached to VPNB.

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5.4.2.2.  VPN policy

   The vpn-policy helps to express a multiVPN scenario where a logical
   access belongs to multiple VPNs.  Multiple VPN policy can be created
   to handle the subVPN case where each logical access is part of a
   different set of VPNs.

   As a site can belong to multiple VPNs, the vpn-policy may be composed
   of multiple entries.  A filter can be applied to specify that only
   some LANs of the site should be part of a particular VPN.  Each time
   a site (or LAN) is attached to a VPN, we must precise its role (site-
   role) within the targeted VPN topology.

   +--------------------------------------------------------------+
   |  VPN2_Site3 ------ PE7                                       |
   +-------------------------+                                    |
                             |                                    |
   +-------------------------+                                    |
   |  VPN2_Site1 ------ PE3               PE4 ------ VPN2_Site2   |
   +----------------------------------+                           |
                                      |                           |
   +------------------------------------------------------------+ |
   |  VPN3_Site1 ------ PE5           |   PE6 ------ VPN3_Site2 | |
   +------------------------------------------------------------+ |
                                      |                           |
                                      +---------------------------+

   In the example above, VPN3_Site2 is part of two VPNs : VPN3 and VPN2.
   It will play hub-role in VPN2 and any-to-any role in VPN3.  We can
   express such multiVPN scenario as follows :

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   <site>
    <site-id>VPN3_Site2</site-id>
    <vpn-policy-list>
     <vpn-policy>
      <vpn-policy-id>POLICY1</vpn-policy-id>
      <entries>
       <id>ENTRY1</id>
       <vpn>
        <vpn-id>VPN2</vpn-id>
        <site-role>hub-role</site-role>
       </vpn>
      </entries>
      <entries>
       <id>ENTRY2</id>
       <vpn>
        <vpn-id>VPN3</vpn-id>
        <site-role>any-to-any-role</site-role>
       </vpn>
      </entries>
     </vpn-policy>
    </vpn-policy-list>
    <site-network-accesses>
     <site-network-access>
      <site-network-access-id>LA1</site-network-access-id>
      <vpn-attachment>
       <vpn-policy-id>POLICY1</vpn-policy-id>
      </vpn-attachment>
     </site-network-access>
    </site-network-accesses>
   </site>

   Now in case more specific VPN attachment is necessary, filtering can
   be used.  For example, if LAN1 from VPN3_site2 must be attached to
   VPN2 as hub and LAN2 must be attached to VPN3, the following
   configuration can be used :

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   <site>
    <site-id>VPN3_Site2</site-id>
    <vpn-policy-list>
     <vpn-policy>
      <vpn-policy-id>POLICY1</vpn-policy-id>
      <entries>
       <id>ENTRY1</id>
       <filter>
        <lan-tag>LAN1</lan-tag>
       </filter>
       <vpn>
        <vpn-id>VPN2</vpn-id>
        <site-role>hub-role</site-role>
       </vpn>
      </entries>
      <entries>
       <id>ENTRY2</id>
       <filter>
        <lan-tag>LAN2</lan-tag>
       </filter>
       <vpn>
        <vpn-id>VPN3</vpn-id>
        <site-role>any-to-any-role</site-role>
       </vpn>
      </entries>
     </vpn-policy>
    </vpn-policy-list>
    <site-network-accesses>
     <site-network-access>
      <site-network-access-id>LA1</site-network-access-id>
      <vpn-attachment>
       <vpn-policy-id>POLICY1</vpn-policy-id>
      </vpn-attachment>
     </site-network-access>
    </site-network-accesses>
   </site>

5.5.  Deciding where to connect the site

   The management system will have to decide where to connect the site
   in the provider network (PE, aggregation switch ...).  The current
   model proposes parameters and constraints that will help the
   management system to decide where to attach the customer site.  The
   management system SHOULD honor the customer constraints, if the
   constraint cannot be filled, the management system MUST not provision
   the site and SHOULD provide an information to the user.  How the
   information is provided is out of scope of the document.  It would be
   up to the user to relax the constraint or not.  Parameters are just

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   hints for management system for service placement.  In addition to
   parameters and constraints : the managemen system decision MAY be
   based on any other internal constraint that are up to the service
   provider : least load, distance ...

5.5.1.  Parameter : Site location

   The location information provided in this model MAY be used by a
   management system to decide the target PE to mesh the site.

                                        PoP#1 (New York)
                                     +---------+
                                     |   PE1   |
                Site #1 ---...       |   PE2   |
               (Atlantic City)       |   PE3   |
                                     +---------+

                                        PoP#2 (Washington)
                                     +---------+
                                     |   PE4   |
                                     |   PE5   |
                                     |   PE6   |
                                     +---------+

                                        PoP#3 (Philadelphia)
                                     +---------+
                                     |   PE7   |
                Site #2 ---...       |   PE2   |
               (Reston)              |   PE9   |
                                     +---------+

   In the example above, the management system may decide to mesh Site
   #1 on a PE from Philadelphia PoP for distance reason.  It may also
   take into account resources available on PEs to decide the exact
   target PE (least load).  In case of shortest distance PE used, it may
   also decide to mesh Site #2 on Washington PoP.

5.5.2.  Constraint : Site diversity

   The site diversity defines what is the acceptable fate sharing level
   in case multiple sites for a single VPN must be provisioned in a
   common location.  The site diversity introduces the notion of site-
   group.  Sites belonging to the same site-group cannot share the same
   fate.

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   The site-group information MUST be considered as local to a
   particular customer, so different customers can use the same site-
   group identifier.

   We propose to introduce two constraints :

      PoP diverse : site belonging to the same site-group MUST be
      provisioned on different PoPs.

      PE diverse : site belonging to the same site-group MUST be
      provisioned on different PE routers.

      Linecard diverse : site belonging to the same site-group MUST be
      provisioned at least on a different linecard of a particular PE.

      None diverse : site does not require any particular constraint.

   How these diversity constraints are applied is out of scope of the
   document.  As an example, the management system receiving the request
   for diversity, MAY exchange information with some OSS components to
   define the best target PEs based on location and resource
   availability.

   As example, if a company has multiple small branch offices (single
   homed) that requires to be connected in the same location, it is
   desirable to dispatch the attachment on multiple PEs.  So in case of
   PE crash, only some offices will be impacted.

                                        PoP#1
                                     +---------+
                                     |   PE1   |
               Office#1 ---...       |   PE2   |
               Office#2 ---...       |   PE3   |
               Office#3 ---...       |   PE4   |
               Office#...--...       +---------+
               Office#100--...

   In the figure above, it may be good to mesh 25 offices on each PE of
   PoP#1 to prevent concentration of two many customer offices on common
   network elements.

   In case, in a particular site-group, there are sites requesting a
   specific diversity type (pe-diverse) and others are requesting
   another type (PoP or LC diverse), the management system MUST take
   into account informations (linecards, PE and PoP) from all the sites
   within the site group.  As an example : site A is connected to PE#1
   PoP#1 in site-group #100.

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   o  Site B is ordered with pe-diverse site-group #100.  The management
      system can decide to mesh site B in any PE of PoP#1 expect PE#1.
      It can also choose another PoP.  Let's say that it chooses PE#2
      PoP#1.

   o  Site C is ordered with pe-diverse site-group #100.  The management
      system can decide to mesh site C in any PE of PoP#1 expect PE#1
      and PE#2.  It can also choose another PoP.  Let's say that it
      chooses PE#3 PoP#2.

   o  Site D is ordered with pe-diverse site-group #100.  The management
      system can decide to mesh site D in any PE of PoP#1 or PoP#2
      expect PE#1 and PE#2 and PE#3.  It can also choose another PoP.
      Let's say that it chooses PE#4 PoP#3.

   o  Site E is ordered with PoP-diverse site-group #100.  The
      management system can decide to mesh site E in any PE that are not
      in PoP#1, PoP#2, PoP#3.  Let's say that it chooses PE#5 PoP#6.

   o  Site F is ordered with PoP-diverse site-group #100.  The
      management system can decide to mesh site F in any PE that are not
      in PoP#1, PoP#2, PoP#3, PoP#6.  Let's say that it chooses PE#6
      PoP#7.

   o  Site G is ordered with pe-diverse site-group #100.  The management
      system can decide to mesh site G in any PE expect PE#1 PE#2 PE#3
      PE#4 PE#5 PE#6.  Let's say that it chooses PE#7 PoP#1.

5.5.3.  Constraint : Site network access availability

   A site may be multihomed, so having multiple site-network-accesses.
   By default, diversity constraint for accesses belonging to the same
   site is set to "PE-diverse".

   Consider a dual homed hub site, it is desirable for redundancy to
   provision the two VPN access connections on two different PEs or two
   different PoPs.

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                                        PoP#1
                                     +---------+
                                     |   PE1   |
       Hub_Site_primary ------       |   PE2   |
                                     |   PE3   |
                                     +---------+

                                        PoP#2
                                     +---------+
                                     |   PE4   |
       Hub_Site_backup -------       |   PE5   |
                                     |   PE6   |
                                     +---------+

   In a PoP diverse scenario, the management system may decide to mesh
   Hub_Site_primary on any PE of PoP#1 and Hub_Site_backup on any PE of
   PoP#2.  In a PE diverse scenario, if the management system decides to
   mesh Hub_Site_primary on PE1, it is require to mesh Hub_Site_backup
   on any PE different from PE1.

   The site-network-access/availability defines parameters for the site
   redundancy.  The access-priority defines a preference for a
   particular access.  This preference is used to model any kind of
   loadbalancing or primary/backup scenario.  The highest the access-
   priority is, and the highest the preference will be.

   The figure below describes how access-priority attribute can be used.

   Hub#1 LAN (Primary/backup)          Hub#2 LAN (Loadsharing)
     |                                                  |
     |     access-priority 1       access-priority 1    |
     |--- CE1 ------- PE1         PE3 --------- CE3 --- |
     |                                                  |
     |                                                  |
     |--- CE2 ------- PE2         PE4 --------- CE4 --- |
     |     access-priority 2       access-priority 1    |

                             PE5
                              |
                              |
                              |
                             CE5
                              |
                         Spoke#1 site (Single-homed)

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   In the figure above, Hub#2 requires loadsharing so all the site-
   network-accesses must use the same access-priority value.  At the
   contrary, as Hub#1 requires primary/backup, a higher access-priority
   will be configured on the primary access.

   More complex scenario can be modeled.  Let's consider a Hub site with
   5 accesses to the network (A1,A2,A3,A4,A5).  The customer wants to
   loadshare traffic on A1,A2 in the nominal situation.  If A1 and A2
   fails, he wants to loadshare traffic on A3 and A4, and finally if A1
   to A4 are down, he wants to use A5.  We can model it easily by
   associating the following access-priorities : A1=100, A2=100, A3=50,
   A4=50, A5=10.

5.5.3.1.  Traffic protection

   The service model supports the ability to protect traffic for the
   site.  Protection provides a better availability to multihoming by,
   for example, using local-repair techniques in case of failures.  The
   associated level of service guarantee would be based on an agreement
   between customer and service provider and is out of scope of this
   document.

       Site#1                            Site#2
   CE1 ----- PE1 -- P1            P3 -- PE3 ---- CE3
    |                              |             |
    |                              |             |
   CE2 ----- PE2 -- P2            P4 -- PE4 ---- CE4
             /
            /
   CE5 ----+
      Site#3

   In the figure above, we consider an IPVPN service with three sites
   including two dual homed sites (site#1 and #2).  For dual homed
   sites, we consider PE1-CE1 and PE3-CE3 as primary, and
   PE2-CE2,PE4-CE4 as backup for the example (even if protection also
   applies to loadsharing scenarios.)

   In order to protect Site#2 against a failure, user may set the
   enabled leaf of traffic-protection to true on the site-network-
   accesses of site#2.  How the traffic protection will be implemented
   is out of scope of the document.  But as an example, in such case, if
   we consider traffic coming from a remote site (site#1 or site#3),
   primary path is to use PE3 as egress PE.  PE3 may have preprogrammed
   a backup forwarding entry pointing to backup path (through PE4-CE4)

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   for all prefixes going through PE3-CE3 link.  How backup path is
   computed is out of scope of the document.  When PE3-CE3 link fails,
   traffic is still received by PE3 but PE3 switch automatically traffic
   to the backup entry, path will so be PE1-P1-(...)-P3-PE3-PE4-CE4
   until remote PEs reconverge and use PE4 as egress PE.

5.5.4.  Route Distinguisher and VRF allocation

   Route distinguisher is also a critical parameter of PE-based L3VPN as
   described in [RFC4364] that will allow to distinguish common
   addressing plans in different VPNs.  As for Route-targets, it is
   expected management system to allocate a VRF on the target PE and a
   route-distinguisher for this VRF.

   If a VRF exists on the target PE, and the VRF fulfils the
   connectivity constraints for the site, there is no need to recreate
   another VRF and the site MAY be meshed within this existing VRF.  How
   the management system checks that an existing VRF fulfils the
   connectivity constraints for a site is out of scope of this document.

   If no VRF exists on the target PE, filling the site constraints, the
   management system will have to initiate a new VRF creation on the
   target PE and will have to allocate a new route distinguisher for
   this new VRF.

   The management system MAY apply a per-VPN or per-VRF allocation
   policy for the route-distinguisher depending of the service provider
   policy.  In a per-VPN allocation policy, all VRFs (dispatched on
   multiple PEs) within a VPN will share the same route distinguisher
   value.  In a per-VRF model, all VRFs will always have a unique route-
   distinguisher value.  Some other allocation policies are also
   possible, and this document does not restrict the allocation policies
   to be used.

   Allocation of route-distinguisher MAY be done in the same way as the
   route-targets.  The example provided in Section 5.1.1.1 could be
   reused.

   Note that a service provider MAY decide to configure target PE for
   automated allocation of route distinguisher.  In this case, there
   will be no need for any backend system to allocate a route-
   distinguisher value.

5.6.  Deciding the access type for the site

   The management system will need to elect the access method to connect
   the site to the customer (for example : PPP over ISDN, xSDL, leased
   line, Ethernet backhaul ...).  The customer may provide some

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   parameters/constraints that will provide hints to the management
   system.

   The bearer container information SHOULD be used as first input :

   o  The "requested-type" provides an information about the media type
      the customer would like.  If the "strict" leaf is equal to "true",
      this MUST be considered as a strict constraint, so the management
      system cannot connect the site with another media type.  If the
      "strict" leaf is equal to "false" (default), if the requested-type
      cannot be fullfilled, the management system can select another
      type.  The supported media types SHOULD be communicated by the
      service provider to the customer by a mechanism that is out of
      scope of the document.

   o  The "always-on" leaf defines a strict constraint : if set to
      "true", the management system MUST elect a media type which is
      always-on (this means no Dial access type).

   o  The "bearer-reference" is used in case the customer has already
      ordered a network connection to the service provider apart of the
      IPVPN site and wants to reuse this connection.  The string used in
      an internal reference from the service provider describing the
      already available connection.  This is also a strict requirement
      that cannot be relaxed.

   Other parameters like the requested svc-input-bandwidth, svc-output-
   bandwidth MAY help to decide the access type to be used.  Any other
   internal parameters from the service provider can be used in
   addition.

5.7.  Security

   Security container defines customer specific security parameters for
   the site.

5.7.1.  Authentication

   The current model does not support any authentication parameters, but
   such parameters may be added in the authentication container through
   augmentation.

5.7.2.  Encryption

   Encryption can be requested on the connection.  It may be performed
   at layer 2 or layer 3 by selecting the appropriate enumeration in
   "layer" leaf.  The encryption profile can be a service provider
   defined profile or customer specific.

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5.8.  Management

   The model proposes three types of common management options :

   o  provider-managed : the CE router is managed only by the provider.
      In this model, the responsibility boundary between SP and customer
      is between CE and customer network.

   o  customer-managed : the CE router is managed only by the customer.
      In this model, the responsibility boundary between SP and customer
      is between PE and CE.

   o  co-managed : the CE router is primarly managed by the provider and
      in addition SP lets customer accessing the CE for some
      configuration/monitoring purpose.  In the co-managed mode the
      responsibility boundary is the same as the provider-managed model.

   Based on the management model, different security options MAY be
   derived.

   In case of "provider-managed" or "co-managed", the model proposes
   some option to define the management transport protocol (IPv4 or
   IPv6) and the associated management address.

5.9.  Routing protocols

   Routing-protocol defines which routing protocol must be activated
   between the provider and the customer router.  The current model
   support : bgp, rip, rip-ng, ospf, static, direct, vrrp.

   The routing protocol defined applies at the provider to customer
   boundary.  Depending of the management of the management model, it
   may apply to the PE-CE boundary or CE to customer boundary.  In case
   of customer managed site, the routing-protocol defined will be
   activated between the PE and the CE router managed by the customer.
   In case of provider managed site, the routing-protocol defined will
   be activated between the CE managed by the SP and the router or LAN
   belonging to the customer.  In this case, it is expected that the PE-
   CE routing will be configured based on the service provider rules as
   both are managed by the same entity.

                               Rtg protocol
       192.0.2.0/24 ----- CE ----------------- PE1

                    Customer managed site

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             Rtg protocol
       Customer router ----- CE ----------------- PE1

                    Provider managed site

   All the examples below will refer to a customer managed site case.

5.9.1.  Dual stack handling

   All routing protocol types support dual stack by using address-family
   leaf-list.

   Example of Dual stack using the same routing protocol :

   <routing-protocols>
     <routing-protocol>
       <type>static</type>
       <static>
           <address-family>ipv4</address-family>
           <address-family>ipv6</address-family>
       </static>
     </routing-protocol>
   </routing-protocols>

   Example of Dual stack using two different routing protocols :

   <routing-protocols>
     <routing-protocol>
       <type>rip</type>
       <rip>
           <address-family>ipv4</address-family>
       </rip>
     </routing-protocol>
     <routing-protocol>
       <type>ospf</type>
       <ospf>
           <address-family>ipv6</address-family>
       </ospf>
     </routing-protocol>
   </routing-protocols>

5.9.2.  Direct LAN connection onto SP network

   Routing-protocol "direct" SHOULD be used when a customer LAN is
   directly connected to the provider network and must be advertised in
   the IPVPN.

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           LAN attached directly to provider network :

           192.0.2.0/24 ----- PE1

5.9.3.  Direct LAN connection onto SP network with redundancy

   Routing-protocol "vrrp" SHOULD be used when a customer LAN is
   directly connected to the provider network and must be advertised in
   the IPVPN and LAN redundancy is expected.

         LAN attached directly to provider network with LAN redundancy:

           192.0.2.0/24 ------ PE1
                          |
                          +-- PE2

5.9.4.  Static routing

   Routing-protocol "static" MAY be used when a customer LAN is
   connected to the provider network through a CE router and must be
   advertised in the IPVPN.

                                   Static rtg
          192.0.2.0/24 ------ CE -------------- PE
                               |                |
                               |      Static route 192.0.2.0/24 nh CE
               Static route 0.0.0.0/0 nh PE

5.9.5.  RIP routing

   Routing-protocol "rip" MAY be used when a customer LAN is connected
   to the provider network through a CE router and must be advertised in
   the IPVPN.

   In case of dual stack, the management system will be responsible to
   configure rip (including right version number) and rip-ng instances
   on network elements.

                                   RIP rtg
           192.0.2.0/24 ------ CE -------------- PE

5.9.6.  OSPF routing

   Routing-protocol "ospf" MAY be used when a customer LAN is connected
   to the provider network through a CE router and must be advertised in
   the IPVPN.

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   It can be used to extend an existing OSPF network and interconnect
   different areas.  See [RFC4577] for more details.

                             +---------------------+
                             |                     |
                     OSPF    |                     | OSPF
                     area 1  |                     | area 2
    (OSPF                    |                     |          (OSPF
    area 1) --- CE ---------- PE               PE ----- CE --- area 2)
                             |                     |
                             +---------------------+

   The model also proposes an option to create an OSPF sham-link between
   two sites sharing the same area and having a backdoor link.  The
   sham-link is created by referencing the target site sharing the same
   OSPF area.  The management system will be responsible to check if
   there is already a shamlink configured for this VPN and area between
   the same pair of PEs.  If there is no existing shamlink, the
   management system will provision it, this shamlink MAY be reused by
   other sites.

                           +------------------------+
                           |                        |
                           |                        |
                           |   PE (--shamlink--)PE  |
                           |    |                |  |
                           +----|----------------|--+
                                | OSPF area1     | OSPF area 1
                                |                |
                                CE1             CE2
                                |                |
                           (OSPF area1)       (OSPF area1)
                                |                |
                                +----------------+

   Regarding Dual stack support, user MAY decide to fill both IPv4 and
   IPv6 address families, if both protocols SHOULD be routed through
   OSPF.  As OSPF is using two different protocol for IPv4 and IPv6, the
   management system will need to configure both ospf version 2 and
   version 3 on the PE-CE link.

   Example of OSPF routing parameters in service model.

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   <routing-protocols>
     <routing-protocol>
       <type>ospf</type>
       <ospf>
           <area-address>0.0.0.1</area-address>
           <address-family>ipv4</address-family>
           <address-family>ipv6</address-family>
       </ospf>
     </routing-protocol>
   </routing-protocols>

   Example of PE configuration done by management system :

   router ospf 10
    area 0.0.0.1
     interface Ethernet0/0
   !
   router ospfv3 10
    area 0.0.0.1
     interface Ethernet0/0
    !

5.9.7.  BGP routing

   Routing-protocol "bgp" MAY be used when a customer LAN is connected
   to the provider network through a CE router and must be advertised in
   the IPVPN.

                                   BGP rtg
         192.0.2.0/24 ------ CE -------------- PE

   The session addressing will be derived from connection parameters as
   well as internal knowledge of SP.

   In case of dual stack access, user MAY request BGP routing for both
   IPv4 and IPv6 by filling both address-families.  It will be up to SP
   and management system to decide how to decline the configuration (two
   BGP sessions, single, multisession ...).

   The service configuration below actives BGP on PE-CE link for both
   IPv4 and IPv6.

   BGP activation requires SP to know the address of the customer peer.
   "static-address" allocation type for the IP connection MUST be used.

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   <routing-protocols>
     <routing-protocol>
       <type>bgp</type>
       <bgp>
           <autonomous-system>65000</autonomous-system>
           <address-family>ipv4</address-family>
           <address-family>ipv6</address-family>
       <bgp>
     </routing-protocol>
   </routing-protocols>

   This service configuration can be derived by management system into
   multiple flavors depending on SP flavor.

   Example #1 of PE configuration done by management system
   (single session IPv4 transport):

   router bgp 100
    neighbor 203.0.113.2 remote-as 65000
    address-family ipv4 vrf Cust1
       neighbor 203.0.113.2 activate
    address-family ipv6 vrf Cust1
       neighbor 203.0.113.2 activate
       neighbor 203.0.113.2 route-map SET-NH-IPV6 out

   Example #2 of PE configuration done
   by management system (two sessions):

   router bgp 100
    neighbor 203.0.113.2 remote-as 65000
    neighbor 2001::2 remote-as 65000
    address-family ipv4 vrf Cust1
       neighbor 203.0.113.2 activate
    address-family ipv6 vrf Cust1
       neighbor 2001::2 activate

   Example #3 of PE configuration done
   by management system (multisession):

   router bgp 100
    neighbor 203.0.113.2 remote-as 65000
    neighbor 203.0.113.2 multisession per-af
    address-family ipv4 vrf Cust1
       neighbor 203.0.113.2 activate
    address-family ipv6 vrf Cust1
       neighbor 203.0.113.2 activate
       neighbor 203.0.113.2 route-map SET-NH-IPV6 out

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5.10.  Service

   The service defines service parameters associated with the site.

5.10.1.  Bandwidth

   The service bandwidth refers to the bandwidth requirement between PE
   and CE (WAN access bandwidth).  The requested bandwidth is expressed
   as svc-input-bandwidth and svc-output-bandwidth in bit per seconds.
   Input/output direction is using customer site as reference : input
   bandwidth so means download bandwidth for the site, and output
   bandwidth means upload bandwidth for the site.

   Using a different input and output bandwidth will allow service
   provider to know if customer allows for asymmetric bandwidth access
   like ADSL.  It can also be used to rate-limit in a different way
   upload and download on a symmetric bandwidth access.

   The bandwidth is a service bandwidth : expressed primarly as IP
   bandwidth but if the customer enables MPLS for carrier's carrier,
   this becomes MPLS bandwidth.

5.10.2.  QoS

   The model proposes to define QoS parameters in an abstracted way :

   o  qos-classification-policy : define a set of ordered rules to
      classify customer traffic.

   o  qos-profile : outgoing QoS profile to be applied.

5.10.2.1.  QoS classification

   QoS classification rules are handled by qos-classification-policy.
   The qos-classification-policy is an ordered list of rules that match
   a flow or application and set the appropriate target class of service
   (target-class-id).  The user can define the match using an
   application reference or a more specific flow definition (based layer
   3 source and destination address, layer 4 ports, layer 4 protocol).
   The current model defines some applications but new application
   identities may be added through augmentation.  The exact meaning of
   each application identity is up to the service provider, so it will
   be necessary for the service provider to advise customer on usage of
   application matching.

   Where the classification is done depends on the SP implementation of
   the service, but classification concerns the flow coming from the
   customer site and entering the network.

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                                  Provider network
                             +-----------------------+
      192.0.2.0/24
   198.51.100.0/24 ---- CE --------- PE

     Traffic flow
    ---------->

   In the figure above, the management system can decide :

   o  if the CE is customer managed, to implement the classification
      rule in the ingress direction on the PE interface.

   o  if the CE is provider managed, to implement the classification
      rule in the ingress direction on the CE interface connected to
      customer LAN.

   The figure below describes a sample service description of qos-
   classification for a site :

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   <service>
       <qos>
           <qos-classification-policy>
               <rules>
                   <id>1</id>
                   <match-flow>
                       <ipv4-src-prefix>192.0.2.0/24</ipv4-src-prefix>
                       <ipv4-dst-prefix>203.0.113.1/32</ipv4-dst-prefix>
                       <l4-dst-port>80</l4-dst-port>
                       <l4-protocol>tcp</l4-protocol>
                   </match-flow>
                   <target-class-id>DATA2</target-class-id>
               </rules>
               <rules>
                   <id>2</id>
                   <match-flow>
                       <ipv4-src-prefix>192.0.2.0/24</ipv4-src-prefix>
                       <ipv4-dst-prefix>203.0.113.1/32</ipv4-dst-prefix>
                       <l4-dst-port>21</l4-dst-port>
                       <l4-protocol>tcp</l4-protocol>
                   </match-flow>
                   <target-class-id>DATA2</target-class-id>
               </rules>
               <rules>
                   <id>3</id>
                   <match-application>p2p</match-application>
                   <target-class-id>DATA3</target-class-id>
               </rules>
               <rules>
                   <id>4</id>
                   <target-class-id>DATA1</target-class-id>
               </rules>
           </qos-classification-policy>
       </qos>
   </service>

   In the example above :

   o  HTTP traffic from 192.0.2.0/24 LAN destinated to 203.0.113.1/32
      will be classified in DATA2.

   o  FTP traffic from 192.0.2.0/24 LAN destinated to 203.0.113.1/32
      will be classified in DATA2.

   o  Peer to peer traffic wille be classified in DATA3.

   o  All other traffic will be classified in DATA1.

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   The order of rules is really important.  The management system
   responsible for translating those rules in network element
   configuration MUST keep the same processing order in element
   configuration.  The order of rule is defined by the "id" leaf.  The
   lowest "id" MUST be processed first.

5.10.2.2.  QoS profile

   User can choose between standard profile provided by the operator or
   custom profile.

                                  Provider network
                             +-----------------------+
   192.0.2.0/24
   198.51.100.0/24 ---- CE --------- PE
                           \       /
                          qos-profile

   A custom qos-profile is defined as a list of class of services and
   associated properties.  The properties are :

   o  rate-limit : used to rate-limit the class of service.  The value
      is expressed as a percentage of the global service bandwidth.

   o  priority-level : used to define priorities between class of
      services.  The value of the priority to be used is dependant of
      each administration.  The higher the priority-level is, the higher
      the priority of the class will be.  Priority-level can be used to
      define strict priority queueing.  A priority-level 250 class will
      be served before a priority-level 100 class until there is no more
      packet to process or until rate-limit does not allow anymore
      packets from the higher priority class.

   o  guaranteed-bw-percent : used to define a guaranteed amount of
      bandwidth for the class of service.  It is expressed as a
      percentage.  The guaranteed-bw-percent uses available bandwidth at
      the priority-level of the class.  The reference bandwidth is based
      on svc-input-bandwidth or svc-output-bandwidth.

   Example of service configuration using a standard qos profile :

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   <site>
       <site-id>1245HRTFGJGJ154654</site-id>
       <service>
           <svc-input-bandwidth>100000000</svc-input-bandwidth>
           <svc-output-bandwidth>100000000</svc-output-bandwidth>
           <qos>
               <qos-profile>
                   <profile>PLATINUM</profile>
               </qos-profile>
           </qos>
       </service>
   </site>
   <site>
       <site-id>555555AAAA2344</site-id>
       <service>
           <svc-input-bandwidth>2000000</svc-input-bandwidth>
           <svc-output-bandwidth>2000000</svc-output-bandwidth>
           <qos>
               <qos-profile>
                   <profile>GOLD</profile>
               </qos-profile>
           </qos>
       </service>
   </site>

   Example of service configuration using a custom qos profile :

 <site>
     <site-id>Site1</site-id>
     <service>
         <svc-input-bandwidth>100000000</svc-input-bandwidth>
         <svc-output-bandwidth>100000000</svc-output-bandwidth>
         <qos>
             <qos-profile>
                 <classes>
                     <class>
                         <class-id>REAL_TIME</class-id>
                         <rate-limit>10</rate-limit>
                         <priority-level>10</priority-level>
                     </class>
                     <class>
                         <class-id>DATA</class-id>
                         <priority-level>5</priority-level>
                     </class>
                 </classes>
             </qos-profile>
         </qos>

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     </service>
 </site>
 <site>
     <site-id>Site2</site-id>
     <service>
         <svc-input-bandwidth>2000000</svc-input-bandwidth>
         <svc-output-bandwidth>2000000</svc-output-bandwidth>
         <qos>
             <qos-profile>
                 <classes>
                     <class>
                       <class-id>REAL_TIME</class-id>
                       <rate-limit>30</rate-limit>
                       <priority-level>10</priority-level>
                     </class>
                     <class>
                       <class-id>DATA1</class-id>
                       <priority-level>5</priority-level>
                       <guaranteed-bw-percent>80</guaranteed-bw-percent>
                     </class>
                     <class>
                       <class-id>DATA2</class-id>
                       <priority-level>5</priority-level>
                       <guaranteed-bw-percent>20</guaranteed-bw-percent>
                     </class>
                 </classes>
             </qos-profile>
         </qos>
     </service>
 </site>

   The custom qos-profile for site1 defines that traffic from REAL_TIME
   class will have a higher priority than traffic from DATA class.  The
   REAL_TIME traffic will be rate-limit to 10% of the service bandwidth
   (10% of 100Mbps = 10Mbps) to let some place for DATA traffic.

   The custom qos-profile for site2 defines that traffic from REAL_TIME
   class will have a higher priority than traffic from data traffic.
   Data traffic will be splitted in two class of service DATA1 and DATA2
   that will share bandwidth between them according to the percentage of
   guaranteed-bw-percent.  The maximum of percentage to be used is not
   limited by this model but MUST be limited by the management system
   according to the policies authorized by the service provider.  The
   REAL_TIME traffic will be rate-limit to 30% of the service bandwidth
   (30% of 100Mbps = 30Mbps) to let some place for data traffic.  In
   case of congestion of the access, the REAL_TIME traffic can go up to
   30Mbps (Let's assume that 20Mbps only are consumed).  The DATA1 and

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   DATA2 will share remaining bandwidth (80Mbps) according to their
   percentage.  So DATA1 will be served with at least 64Mbps of
   bandwidth.

5.10.3.  Multicast

   The multicast section defines the type of site in the customer
   multicast topology : source, receiver, or both.  These parameters
   will help management system to optimize the multicast service.  User
   can also define the type of multicast relation with the customer :
   router (requires a protocol like PIM), host (IGMP or MLD), or both.
   Transport protocol (IPv4 or IPv6 or both) can also be defined.

5.11.  Enhanced VPN features

5.11.1.  Carrier's Carrier

   In case of Carrier's Carrier ([RFC4364]), a customer MAY want to
   build MPLS service using an IPVPN as transport layer.

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           LAN customer1
               |
               |
              CE1
               |
               | -------------
            (vrf_cust1)
             CE1_ISP1
               |                 ISP1 PoP
               | MPLS link
               | -------------
               |
            (vrf ISP1)
              PE1

             (...)               Provider backbone

              PE2
             (vrf ISP1)
               |
               | ------------
               |
               | MPLS link
               |                 ISP1 PoP
              CE2_ISP1
              (vrf_cust1)
               |-------------
               |
              CE2
               |
            Lan customer1

   In the figure above, ISP1 resells IPVPN service but has no transport
   infrastructure between its PoPs.  ISP1 uses an IPVPN as transport
   infrastructure (belonging to another provider) between its PoPs.

   In order to support CsC, the VPN service must be declared MPLS
   support using the "carrierscarrier" leaf set to true in vpn-svc.  The
   link between CE1_ISP1/PE1 and CE2_ISP1/PE2 must also run a MPLS
   signalling protocol.  This configuration is done at the site level.

   In the proposed model, LDP or BGP can be used as MPLS signalling
   protocol.  In case of LDP, an IGP routing protocol MUST also be

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   activated.  In case of BGP signalling, BGP MUST also be configured as
   routing-protocol.

5.11.2.  Transport constraints

   A customer may require some constraints for transporting traffic
   between particular sites.  As example, a customer may require low
   latencies and disjoint paths between two hub sites.  The current
   model proposes to define a list of constraints that can be augmented
   for unicast and/or multicast traffic.  For unicast traffic, the model
   considers that the constraints are bidirectional (same constraint
   from site1 to site2 and site2 to site1).  For multicast, constraints
   are unidirectional from source to receiver.  The current model
   supports the following constraints :

   o  Latency : this constraint allow to create the lowest latency path
      possible or to create a path with a latency boundary.  In case a
      latency boundary is required, the boundary MUST be encoded in the
      constraint-opaque-value using a millisecond unit.

   o  Bandwidth : this constraint allow to create a path that fits
      specific bandwidth requirement.  If no constraint-opaque-value is
      provided, an implementation SHOULD use the lowest bandwidth
      between the two sites as reference.  If constraint-opaque-value is
      used, the required bandwidth MUST be encoded in Mbps, and the
      implementation MUST use this value as reference.

   o  Jitter : this constraint allow to create a path with a jitter
      boundary. constraint-opaque-value MUST be used with jitter
      constraint and MUST contain the jitter boundary expressed in
      milliseconds.

   o  Path diversity : this constraint allow creation of disjoint paths
      between two sites.  This requires the customer sites to be
      multihomed. constraint-opaque-value is not used.

   o  Site diversity : this constraint is similar to path diversity but
      ensures that paths are not crossing the same provider PoPs.  This
      requires the customer sites to be multihomed. constraint-opaque-
      value MAY be used to encode additional site location that must be
      avoided.

5.12.  External ID references

   The service model sometimes refers to external information through
   identifiers.  As an example, to order a cloud-access to a particular
   Cloud Service Provider (CSP), the model uses an identifier to refer
   to the targeted CSP.  In case, a customer is using directly this

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   service model as an API (through REST or NETCONF for example) to
   order a particular service, the service provider should provide a
   list of authorized identifiers.  In case of cloud-access, the service
   provider will provide the identifiers associated of each available
   CSP.  The same applies to other identifiers like std-qos-profile, oam
   profile-name, provider-profile for encryption ...

   How SP provides those identifiers meaning to the customer is out of
   scope of this document.

5.13.  Defining NNIs

   TBD.

5.14.  Using configuration templates

   The proposed model supports the creation and application of
   configuration templates for sites.

   A template can be configured by creating adding a site in the site-
   template list.  The "site-templates" list contains only templates.
   Real sites are part of the "sites" list.

   Multiple templates can be configured.  Templates can be applied at
   multiple levels referenced by apply-template leaf.  The apply-
   template references the site-id of the template to be called.  The
   location of the apply-template within the sites hierarchy defines
   which parameters must be inherited.  For example, if apply-template
   is done on site-network-access container of a site, only site-
   network-access container parameters (and childs) from the template
   will be applied.

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   <site-template>
    <site-id>Template-VoiceCoS-Cust1</site-id>
     <service>
      <qos>
       <qos-profile>
        <classes>
         <class>
          <class-id>REAL_TIME</class-id>
          <rate-limit>30</rate-limit>
          <priority-level>10</priority-level>
         </class>
         <class>
          <class-id>DATA1</class-id>
          <priority-level>5</priority-level>
          <guaranteed-bw-percent>80</guaranteed-bw-percent>
         </class>
         <class>
          <class-id>DATA2</class-id>
          <priority-level>5</priority-level>
          <guaranteed-bw-percent>20</guaranteed-bw-percent>
         </class>
        </classes>
      </qos-profile>
     </qos>
    </service>
   </site-template>

   <site-template>
       <site-id>Template-VPNsite-Customer1</site-id>
       <service>
           <qos>
               <qos-profile>
                   <profile>PLATINUM</profile>
               </qos-profile>
           </qos>
       </service>
   </site-template>

   Site-templates allow to define configuration blocks that will be
   inherited by one or multiple sites in order to speed up
   configuration.  For example, if all the sites of an IPVPN service
   have the almost same configuration (routing-protocol, qos, management
   ...), a template can be created and each site of the VPN will
   reference the template.  If a site has some particular parameters,
   specific parameters within the site MUST always override parameters
   derived from template.

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   The example above defines two site templates :

   o  Template-VPNsite-Customer1 that will be used to configure all the
      VPN sites for customer 1.

   o  Template-VoiceCoS-Cust1 that will be used to configure some
      special CoS policy on some specific accesses of the VPN.

   In the example below, all sites of VPN1 are inheriting basic
   configuration from template Template-VPNsite-Customer1.  Some
   specific parameters like svc-input-bandwidth are also defined for
   each site.  For Site 4 and 5 , specific QoS parameters are required,
   a new template Template-VoiceCoS-Cust1 is applied at service level
   for these two sites, overriding the service parameters from the
   Template-VPNsite-Customer1 template.

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   <site>
       <site-id>Site1</site-id>
       <apply-template>Template-VPNsite-Customer1</apply-template>
       <service>
           <svc-input-bandwidth>5000000</svc-input-bandwidth>
           <svc-output-bandwidth>5000000</svc-output-bandwidth>
       </service>
   </site>
   <site>
       <site-id>Site2</site-id>
       <apply-template>Template-VPNsite-Customer1</apply-template>
       <service>
           <svc-input-bandwidth>20000000</svc-input-bandwidth>
           <svc-output-bandwidth>20000000</svc-output-bandwidth>
       </service>
   </site>
   <site>
       <site-id>Site3</site-id>
       <apply-template>Template-VPNsite-Customer1</apply-template>
       <service>
           <svc-input-bandwidth>30000000</svc-input-bandwidth>
           <svc-output-bandwidth>30000000</svc-output-bandwidth>
       </service>
   </site>

   <site>
       <site-id>Site4</site-id>
       <apply-template>Template-VPNsite-Customer1</apply-template>
       <service>
           <apply-template>Template-VoiceCoS-Cust1</apply-template>
           <svc-input-bandwidth>100000000</svc-input-bandwidth>
           <svc-output-bandwidth>100000000</svc-output-bandwidth>
       </service>
   </site>
   <site>
       <site-id>Site5</site-id>
       <apply-template>Template-VPNsite-Customer1</apply-template>
       <service>
           <apply-template>Template-VoiceCoS-Cust1</apply-template>
           <svc-input-bandwidth>450000000</svc-input-bandwidth>
           <svc-output-bandwidth>450000000</svc-output-bandwidth>
       </service>
   </site>

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6.  Service model usage example

   As explained in Section 4, this service model is intended to be
   instantiated at a management layer and is not intended to be used
   directly on network elements.  The management system serves as a
   central point of configuration of the overall service.

   This section provides an example on how a management system can use
   this model to configure an IPVPN service on network elements.

   The example wants to achieve the provisionning of a VPN service for 3
   sites using hub and spoke topology.  One of the site will be dual
   homed and loadsharing is expected.

   +-------------------------------------------------------------+
   |   Hub_Site  ------ PE1               PE2 ------ Spoke_Site1 |
   |      |                   +----------------------------------+
   |      |                   |
   |      |                   +----------------------------------+
   |   Hub_Site  ------ PE3               PE4 ------ Spoke_Site2 |
   +-------------------------------------------------------------+

   The following XML describes the overall simplified service
   configuration of this VPN.

   <vpn-svc>
       <vpn-id>12456487</vpn-id>
       <customer-name>CUSTOMER1</customer-name>
       <topology>hub-spoke</topology>
   </vpn-svc>

   When receiving the request for provisioning the VPN service, the
   management system will internally (or through discussion with other
   OSS component) allocates VPN route-targets.  In this specific case
   two RTs will be allocated (100:1 for Hub and 100:2 for Spoke).  The
   output below describes the configuration of Spoke1.

<site>
    <site-id>Spoke_Site1</site-id>
    <site-diversity>
        <type>pe-diverse</type>
        <site-group>100</site-group>
    </site-diversity>
    <location>
        <city-code>NY</city-code>
        <country-code>US</country-code>
    </location>
    <routing-protocols>

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      <routing-protocol>
        <type>bgp</type>
        <bgp>
            <autonomous-system>500</autonomous-system>
            <address-family>ipv4</address-family>
            <address-family>ipv6</address-family>
        </bgp>
      </routing-protocol>
    </routing-protocols>
    <site-network-accesses>
        <site-network-access>
            <site-network-access-id>Spoke_Site1</site-network-access-id>
            <ip-connection>
                <ipv4>
                    <address-allocation-type>l3vpn-svc:static-address</address-allocation-type>
                    <addresses>
                      <provider-address>203.0.113.254</provider-address>
                      <customer-address>203.0.113.2</customer-address>
                      <mask>24</mask>
                    </addresses>
                </ipv4>
                <ipv6>
                    <address-allocation-type>l3vpn-svc:static-address</address-allocation-type>
                    <addresses>
                      <provider-address>2001:db8::1</provider-address>
                      <customer-address>2001:db8::2</customer-address>
                      <mask>64</mask>
                    </addresses>
                </ipv6>
            </ip-connection>
            <vpn-attachment>
                <vpn-id>12456487</vpn-id>
                <site-role>spoke-role</site-role>
            </vpn-attachment>
        </site-network-access>
    </site-network-accesses>
    <management>
        <type>provider-managed</type>
    </management>
    <service>
        <svc-input-bandwidth>450000000</svc-input-bandwidth>
        <svc-output-bandwidth>450000000</svc-output-bandwidth>
    </service>

</site>

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   When receiving the request for provisioning Spoke1 site, the
   management system MUST allocate network resources for this site.  It
   MUST first decide the target network elements to provision the
   access, and especially the PE router (and may be an aggregation
   switch).  As described in Section 5.5, the management system SHOULD
   use the location information and SHOULD use the site-diversity
   constraint to find the appropriate PE.  In this case, we consider
   Spoke1 requires PE diversity with Hub and that management system
   allocate PEs based on lowest distance.  Based on the location
   information, the management system finds the available PEs in the
   nearest area of the customer and picks one that fits the site-
   diversity constraint.

   When the PE is chosen, management system needs to allocate interface
   resources on the node, one interface is so picked from the PE
   available pool.  The management system can start provisioning the PE
   node by using any mean (Netconf, CLI, ...).  The management system
   will check if a VRF is already present that fits the needs.  If not,
   it will provision the VRF : Route distinguisher will come from
   internal allocation policy model, route-targets are coming from the
   vpn-policy configuration of the site (management system allocated
   some RTs for the VPN).  As the site is a spoke site (site-role), the
   management system knows which RT must be imported and exported.  As
   the site is provider managed, some management route-targets may also
   be added (100:5000).  Standard provider VPN policies MAY also be
   added in the configuration.

   Example of generated PE configuration :

   ip vrf Customer1
    export-map STD-CUSTOMER-EXPORT      <---- Standard SP configuration
    route-distinguisher 100:3123234324
    route-target import 100:1
    route-target import 100:5000        <---- Standard SP configuration
    route-target export 100:2                    for provider managed
   !

   When the VRF has been provisioned, the management system can start
   configuring the access on the PE using the allocated interface
   information.  IP addressing is chosen by the management system.  One
   address will be picked from an allocated subnet for the PE, another
   will be used for the CE configuration.  Routing protocols will also
   be configured between PE and CE and due to provider managed model,
   the choice is up to service provider : BGP was chosen for the
   example.  This choice is independant of the routing protocol chosen
   by customer.  For the CE - LAN part, bgp will be used as requested in
   the service model.  Peering addresses will be derived from those of
   the connection.  As CE is provider managed, CE AS number can be

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   automatically allocated by the management system.  Some provider
   standard configuration templates may also be added.

  Example of generated PE configuration :

  interface Ethernet1/1/0.10
   encapsulation dot1q 10
   ip vrf forwarding Customer1
   ip address 198.51.100.1 255.255.255.252 <---- Comes from
                                                   automated allocation
   ipv6 address 2001:db8::10:1/64
   ip access-group STD-PROTECT-IN     <---- Standard SP config
  !
  router bgp 100
   address-family ipv4 vrf Customer1
    neighbor 198.51.100.2 remote-as 65000   <---- Comes from
                                                automated allocation
    neighbor 198.51.100.2 route-map STD in  <---- Standard SP config
    neighbor 198.51.100.2 filter-list 10 in <---- Standard SP config
  !
   address-family ipv6 vrf Customer1
    neighbor 2001:db8::0A10:2 remote-as 65000   <---- Comes from
                                                automated allocation
    neighbor 2001:db8::0A10:2 route-map STD in  <---- Standard SP config
    neighbor 2001:db8::0A10:2 filter-list 10 in <---- Standard SP config
  !
  ip route vrf Customer1 192.0.2.1 255.255.255.255 198.51.100.2
  ! Static route for provider administration of CE
  !

   As the CE router is not reachable at this stage, the management
   system can produce a complete CE configuration that can be uploaded
   to the node by manual operation before sending the CE to customer
   premise.  The CE configuration will be built as for the PE.  Based on
   the CE type (vendor/model) allocated to the customer and bearer
   information, the management system knows which interface must be
   configured on the CE.  PE-CE link configuration is expected to be
   handled automatically using the service provider OSS as both
   resources are managed internally.  CE to LAN interface parameters
   like IP addressing are derived from ip-connection taking into account
   how management system distributes addresses between PE and CE within
   the subnet.  This will allow to produce a plug'n'play configuration
   for the CE.

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   Example of generated CE configuration :

   interface Loopback10
    description "Administration"
    ip address 192.0.2.1 255.255.255.255
   !
   interface FastEthernet10
    description "WAN"
    ip address 198.51.100.2 255.255.255.252 <---- Comes from
                                                   automated allocation
    ipv6 address 2001:db8::0A10:2/64
   !
   interface FastEthernet11
    description "LAN"
    ip address 203.0.113.254 255.255.255.0 <---- Comes from
                                             ip-connection
    ipv6 address 2001:db8::1/64
   !
   router bgp 65000
    address-family ipv4
     redistribute static route-map STATIC2BGP <---- Standard SP
                                                       configuration
     neighbor 198.51.100.1 remote-as 100     <---- Comes from
                                                 automated allocation
     neighbor 203.0.113.2 remote-as 500     <---- Comes from
                                                 ip-connection
    address-family ipv6
     redistribute static route-map STATIC2BGP <---- Standard SP
                                                       configuration
     neighbor 2001:db8::0A10:1 remote-as 100     <---- Comes from
                                                 automated allocation
     neighbor 2001:db8::2 remote-as 500     <---- Comes from
                                                 ip-connection
   !
   route-map STATIC2BGP permit 10
    match tag 10
   !

7.  Interaction with Other YANG Modules

   As expressed in Section 4, this service module is intended to be
   instantiated in management system and not directly on network
   elements.

   It will be the role of the management system to configure the network
   elements.  The management system MAY be modular, so the component
   instantiating the service model (let's call it service component) and

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   the component responsible for network element configuration (let's
   call it configuration component) MAY be different.

            L3VPN-SVC         |
              service model   |
                              |
                   +----------------------+
                   |   Service component  | service datastore
                   +----------------------+
                              |
                              |
                   +----------------------+
              +----|   Config component   |-------+
             /     +----------------------+        \   Network
            /            /            \             \  Configuration
           /            /              \             \ models
          /            /                \             \
   +++++++         ++++++++             ++++++++       +++++++
   + CEA + ------- + PE A +             + PE B + ----- + CEB + Config
   +++++++         ++++++++             ++++++++       +++++++ datastore

   Site A                                       Site B

   In the previous sections, we provided some example of translation of
   service provisioning request to router configuration lines as
   illustration.  In the NetConf/Yang ecosystem, it will be expected
   NetConf/YANG to be used between configuration component and network
   elements to configure the requested service on these elements.

   In this framework, it is expected from standardization to also work
   on specific configuration YANG modelization of service components on
   network elements.  There will be so a strong relation between the
   abstracted view provided by this service model and the detailed
   configuration view that will be provided by specific configuration
   models for network elements.

   Authors of this document are expecting definition of YANG models for
   network elements on this non exhaustive list of items :

   o  VRF definition including VPN policy expression.

   o  Physical interface.

   o  IP layer (IPv4, IPv6).

   o  QoS : classification, profiles...

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   o  Routing protocols : support of configuration of all protocols
      listed in the document, as well as routing policies associated
      with these protocols.

   o  Multicast VPN.

   o  Network Address Translation.

   o  ...

   Example of VPN site request at service level using this model :

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<site>
 <site-id>Site A</site-id>
 <site-network-accesses>
  <site-network-access>
   <ip-connection>
    <ipv4>
     <address-allocation-type>l3vpn-svc:static-address</address-allocation-type>
     <addresses>
      <provider-address>203.0.113.254</provider-address>
      <customer-address>203.0.113.2</customer-address>
      <mask>24</mask>
     </addresses>
    </ipv4>
   </ip-connection>
   <vpn-attachment>
    <vpn-policy-id>VPNPOL1</vpn-policy-id>
   </vpn-attachment>
  </site-network-access>
 </site-network-accesses>
 <routing-protocols>
  <routing-protocol>
   <type>static</type>
   <static>
    <cascaded-lan-prefixes>
     <ipv4-lan-prefixes>
      <lan>198.51.100.0/30</lan>
      <next-hop>203.0.113.2</next-hop>
     </ipv4-lan-prefixes>
    </cascaded-lan-prefixes>
   </static>
  </routing-protocol>
 </routing-protocols>
 <management>
  <type>customer-managed</type>
 </management>
 <vpn-policy-list>
  <vpn-policy>
    <vpn-policy-id>VPNPOL1</vpn-policy-id>
    <entries>
        <id>1</id>
        <vpn>
            <vpn-id>VPN1</vpn-id>
            <site-role>any-to-any-role</site-role>
        </vpn>
    </entries>
  </vpn-policy>
 </vpn-policy-list>
</site>

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   In the service example above, it is expected that the service
   component requests to the configuration component of the management
   system the configuration of the service elements.  If we consider
   that service component selected a PE (PE A) as target PE for the
   site, the configuration component will need to push the configuration
   to PE A.  The configuration component will use several YANG data
   models to define the configuration to be applied to PE A.  The XML
   configuration of PE-A may look like this :

   <if:interfaces>
        <if:interface>
         <if:name>eth0</if:name>
         <if:type>ianaift:ethernetCsmacd</if:type>
         <if:description>
          Link to CEA.
         </if:description>
         <ip:ipv4>
          <ip:address>
           <ip:ip>203.0.113.254</ip:ip>
           <ip:prefix-length>24</ip:prefix-length>
          </ip:address>
          <ip:forwarding>true</ip:forwarding>
         </ip:ipv4>
        </if:interface>
   </if:interfaces>
   <rt:routing>
        <rt:routing-instance>
         <rt:name>VRF_CustA</rt:name>
         <rt:type>l3vpn:vrf</rt:type>
         <rt:description>VRF for CustomerA</rt:description>
         <l3vpn:route-distinguisher>
         100:1546542343
         </l3vpn:route-distinguisher>
         <l3vpn:import-rt>100:1</l3vpn:import-rt>
         <l3vpn:export-rt>100:1</l3vpn:export-rt>
         <rt:interfaces>
          <rt:interface>
           <rt:name>eth0</rt:name>
          </rt:interface>
         </rt:interfaces>
         <rt:routing-protocols>
          <rt:routing-protocol>
           <rt:type>rt:static</rt:type>
           <rt:name>st0</rt:name>
           <rt:static-routes>
            <v4ur:ipv4>
             <v4ur:route>
              <v4ur:destination-prefix>

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              198.51.100.0/30
              </v4ur:destination-prefix>
              <v4ur:next-hop>
               <v4ur:next-hop-address>
               203.0.113.2
               </v4ur:next-hop-address>
              </v4ur:next-hop>
             </v4ur:route>
            </v4ur:ipv4>
           </rt:static-routes>
          </rt:routing-protocol>
         </rt:routing-protocols>
        </rt:routing-instance>
   </rt:routing>

8.  YANG Module

<CODE BEGINS> file "ietf-l3vpn-svc@2016-05-02.yang"

module ietf-l3vpn-svc {
    namespace "urn:ietf:params:xml:ns:yang:ietf-l3vpn-svc";

    prefix l3vpn-svc;

    import ietf-inet-types {
        prefix inet;
    }

    import ietf-yang-types {
        prefix yang;
    }

    organization
     "IETF L3SM Working Group";

    contact
        "WG List:   &lt;mailto:l3sm@ietf.org&gt;

        Editor:

        ";

    description
        "The YANG module defines a generic service configuration
        model for Layer 3 VPN common across all of the vendor
        implementations.";

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    revision 2016-04-19 {
        description
         "* remove reference to core routing model :
            created new address family identities
          * added features
          * Modified bearer parameters
          * Modified union for ipv4/ipv6 addresses to ip-address
          type
          * Add BSR parameters for multicast
          * Add applications matching for QoS classification
          ";
        reference "";
    }
    revision 2016-04-05 {
        description
         "
         * Added linecard diverse for site diversity
         * Added a new diversity enum in placement-diversity : none
         * Added state to site location

         ";
        reference "";
    }
    revision 2016-03-11 {
        description
        "
            * Modify VPN policy and creating a vpn-policy-list
            * Add VPN policy reference and VPN ID reference
            under site-network-access
        ";
        reference "draft-ietf-l3sm-l3vpn-service-yang-05";
    }
    revision 2016-01-04 {
        description
        "
            * Add extranet-vpn container in vpn-svc
            * Creating top level containers
            * Refine groupings
            * Added site-vpn-flavor
        ";
        reference "draft-ietf-l3sm-l3vpn-service-yang-03";
    }
    revision 2016-01-04 {
        description
         "
            * qos-profile moved to choice
            * vpn leaf moved to vpn-id in vpn-policy
            * added ordered-by user to qos classification list

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            * moved traffic protection to access availability
            * creating a choice in matching filter for VPN policy
            * added dot1p matching field in flow-definition
        ";
        reference "";

    }
    revision 2015-12-07 {
        description
         "
            * A site is now a collection of site-accesses.
            This was introduced to support M to N availability.
            * Site-availability has been removed, replaced by
            availability parameters under site-accesses
            * Added transport-constraints within vpn-svc
        ";
        reference "draft-ietf-l3sm-l3vpn-service-yang-02";

    }

    revision 2015-11-03 {
        description "
        * Add ToS support in match-flow
        * nexthop in cascaded lan as mandatory
        * customer-specific-info deleted and moved to routing
        protocols
        * customer-lan-connection modified : need prefix and CE address
        * add choice in managing PE-CE addressing
        * Simplifying traffic protection
        ";
        reference "";
    }
    revision 2015-09-10 {
        description "
        * Refine groupings for vpn-svc
        * Removed name in vpn-svc
        * id in vpn-svc moved to string
        * Rename id in vpn-svc to vpn-id
        * Changed key of vpn-svc list to vpn-id
        * Add DSCP support in flow definition
        ";
        reference "";
    }
    revision 2015-08-07 {
        description
         "
          Multicast :
            * Removed ACL from security

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            * Add FW for site and cloud access
         ";
        reference "";
    }
    revision 2015-08-05 {
        description
         "
          Multicast :
          * Removed anycast-rp identity as discovery mechanism
          * Added rp-group mappings for multicast
          * Added flag for provider managed RP.
         ";
        reference "";
    }
    revision 2015-08-03 {
        description
         " * Creating multiple reusable groupings
           * Added mpls leaf in vpn-svc for carrier's carrier case
           * Modify identity single to single-site
           * Modify site-type to site-role and also child identities.
           * Creating OAM container under site and moved BFD in.
           * Creating flow-definition grouping to be reused
           in ACL, QoS ...
           * Simplified VPN policy.
           * Adding multicast static group to RP mappings.
           * Removed native-vpn and site-role from global site
           cfg, now managed within the VPN policy.
           * Creating a separate list for site templates.
         ";
        reference "draft-ietf-l3sm-l3vpn-service-yang-01";
    }
    revision 2015-07-02 {
        reference "draft-ietf-l3sm-l3vpn-service-yang-00";
    }
    revision 2015-04-24 {
        description "
        * Add encryption parameters
        * Adding holdtime for BFD.
        * Add postal address in location
        ";
        reference "draft-lstd-l3sm-l3vpn-service-yang-00";
    }
    revision 2015-02-05 {
        description "Initial revision.";
        reference "draft-l3vpn-service-yang-00";
    }

    /* Features */

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    feature cloud-access {
        description
         "Allow VPN to connect to a Cloud Service
         provider.";
    }
    feature multicast {
        description
        "Enables multicast capabilities in a VPN";
    }
    feature ipv4 {
        description
        "Enables IPv4 support in a VPN";
    }
    feature ipv6 {
        description
        "Enables IPv6 support in a VPN";
    }
    feature carrierscarrier {
        description
        "Enables support of carrier's carrier";
    }
    feature traffic-engineering {
        description
        "Enables support of transport constraint.";
    }
    feature traffic-engineering-multicast {
        description
        "Enables support of transport constraint
        for multicast.";
    }
    feature extranet-vpn {
        description
        "Enables support of extranet VPNs";
    }
    feature site-diversity {
        description
        "Enables support of site diversity constraints";
    }
    feature encryption {
        description
        "Enables support of encryption";
    }
    feature qos {
        description
        "Enables support of Class of Services";
    }
    feature qos-custom {
        description

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        "Enables support of custom qos profile";
    }
    feature rtg-bgp {
        description
        "Enables support of BGP routing protocol.";
    }
    feature rtg-rip {
        description
        "Enables support of RIP routing protocol.";
    }
    feature rtg-ospf {
        description
        "Enables support of OSPF routing protocol.";
    }
    feature rtg-ospf-sham-link {
        description
        "Enables support of OSPF sham-links.";
    }
    feature rtg-vrrp {
        description
        "Enables support of VRRP routing protocol.";
    }
    feature fast-reroute {
        description
        "Enables support of Fast Reroute.";
    }
    feature bfd {
        description
        "Enables support of BFD.";
    }
    feature always-on {
        description
        "Enables support for always-on access
        constraint.";
    }
    feature requested-type {
        description
        "Enables support for requested-type access
        constraint.";
    }
    feature bearer-reference {
        description
        "Enables support for bearer-reference access
        constraint.";
    }

    /* Typedefs */

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    typedef svc-id {
        type string;
        description
         "Defining a type of service component
         identificators.";
    }

    typedef template-id {
        type string;
        description
         "Defining a type of service template
         identificators.";
    }

    typedef placement-diversity {
        type enumeration {
            enum "pop-diverse" {
                description
                 "The access must use another PoP
                 compared
                 to other accesses in the same group.";
            }
            enum "pe-diverse" {
                description
                 "The access must use another PE
                 compared
                 to other accesses in the same group.";
            }
            enum "linecard-diverse" {
                description
                 "The access must use another linecard
                 compared
                 to other accesses in the same group.";
            }
            enum "non-diverse" {
                description
                 "No diversity required.";
            }
        }
        description
         "Defines a type for service placement diversity.";
    }

    /* Identities */

    identity customer-application {
        description
         "Base identity for customer application";

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    }
    identity web {
        description
         "Identity for web application (e.g. HTTP,HTTPS)";
    }
    identity mail {
        description
         "Identity for mail applications";
    }
    identity file-transfer {
        description
         "Identity for file transfer applications (
         e.g. FTP, SFTP, ...)";
    }
    identity database {
        description
         "Identity for database applications";
    }
    identity social {
        description
         "Identity for social network applications";
    }
    identity games {
        description
         "Identity for gaming applications";
    }
    identity p2p {
        description
         "Identity for peer to peer applications";
    }
    identity network-management {
        description
         "Identity for management applications (e.g. telnet
            syslog, snmp ...)";
    }
    identity voice {
        description
         "Identity for voice applications";
    }
    identity video {
        description
         "Identity for video conference applications";
    }

    identity address-family {
        description
         "Base identity for an address family.";

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    }
    identity ipv4 {
        base address-family;
        description
        "Identity for IPv4 address family.";
    }
    identity ipv6 {
        base address-family;
        description
        "Identity for IPv6 address family.";
    }

    identity site-vpn-flavor {
        description
        "Base identity for the site VPN service flavor.";
    }
    identity site-vpn-flavor-single {
        base site-vpn-flavor;
        description
        "Base identity for the site VPN service flavor.
        Used when the site belongs to only one VPN.";
    }
    identity site-vpn-flavor-multi {
        base site-vpn-flavor;
        description
        "Base identity for the site VPN service flavor.
        Used when a logical connection of a site
        belongs to multiple VPNs.";
    }

    identity site-vpn-flavor-sub {
        base site-vpn-flavor;
        description
        "Base identity for the site VPN service flavor.
        Used when a site has multiple logical connections.
        Each of the connection may belong to different
        multiple VPNs.";
    }

    identity transport-constraint {
        description
         "Base identity for transport constraint.";
    }
    identity tc-latency {
        base transport-constraint;
        description
         "Base identity for transport constraint

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         based on latency.";
    }
    identity tc-jitter {
        base transport-constraint;
        description
         "Base identity for transport constraint
         based on jitter.";
    }
    identity tc-bandwidth {
        base transport-constraint;
        description
         "Base identity for transport constraint
         based on bandwidth.";
    }
    identity tc-path-diversity {
        base transport-constraint;
        description
         "Base identity for transport constraint
         based on path diversity.";
    }
    identity tc-site-diversity {
        base transport-constraint;
        description
         "Base identity for transport constraint
         based on site diversity.";
    }

    identity management {
        description
         "Base identity for site management scheme.";
    }
    identity co-managed {
        base management;
        description
         "Base identity for comanaged site.";
    }
    identity customer-managed {
        base management;
        description
         "Base identity for customer managed site.";
    }
    identity provider-managed {
        base management;
        description
         "Base identity for provider managed site.";
    }

    identity address-allocation-type {

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        description
         "Base identity for address-allocation-type
         for PE-CE link.";
    }
    identity pe-dhcp {
        base address-allocation-type;
        description
         "PE router provides DHCP service to CE.";
    }
    identity static-address {
        base address-allocation-type;
        description
         "PE-CE addressing is static.";
    }
    identity slaac {
        base address-allocation-type;
        description
         "Use IPv6 SLAAC.";
    }

    identity site-role {
        description
         "Base identity for site type.";
    }
    identity any-to-any-role {
        base site-role;
        description
         "Site in a any to any IPVPN.";
    }
    identity spoke-role {
        base site-role;
        description
         "Spoke Site in a Hub & Spoke IPVPN.";
    }
    identity hub-role {
        base site-role;
        description
         "Hub Site in a Hub & Spoke IPVPN.";
    }

    identity vpn-topology {
        description
         "Base identity for VPN topology.";
    }
    identity any-to-any {
        base vpn-topology;

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        description
         "Identity for any to any VPN topology.";
    }
    identity hub-spoke {
        base vpn-topology;
        description
         "Identity for Hub'n'Spoke VPN topology.";
    }
    identity hub-spoke-disjoint {
        base vpn-topology;
        description
         "Identity for Hub'n'Spoke VPN topology
          where Hubs cannot talk between each other.";
    }

    identity multicast-tree-type {
        description
         "Base identity for multicast tree type.";
    }

    identity ssm-tree-type {
        base multicast-tree-type;
        description
         "Identity for SSM tree type.";
    }
    identity asm-tree-type {
        base multicast-tree-type;
        description
         "Identity for ASM tree type.";
    }
    identity bidir-tree-type {
        base multicast-tree-type;
        description
         "Identity for BiDir tree type.";
    }

    identity multicast-rp-discovery-type {
        description
         "Base identity for rp discovery type.";
    }
    identity auto-rp {
        base multicast-rp-discovery-type;
        description
         "Base identity for auto-rp discovery type.";
    }
    identity static-rp {
        base multicast-rp-discovery-type;
        description

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         "Base identity for static type.";
    }
    identity bsr-rp {
        base multicast-rp-discovery-type;
        description
         "Base identity for BDR discovery type.";
    }

    identity routing-protocol-type {
        description
         "Base identity for routing-protocol type.";
    }

    identity ospf {
        base routing-protocol-type;
        description
         "Identity for OSPF protocol type.";
    }

    identity bgp {
        base routing-protocol-type;
        description
         "Identity for BGP protocol type.";
    }

    identity static {
        base routing-protocol-type;
        description
         "Identity for static routing protocol type.";
    }

    identity rip {
        base routing-protocol-type;
        description
         "Identity for RIP protocol type.";
    }

    identity rip-ng {
        base routing-protocol-type;
        description
         "Identity for RIPng protocol type.";
    }

    identity vrrp {
        base routing-protocol-type;
        description
         "Identity for VRRP protocol type.
         This is to be used when LAn are directly connected

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         to provider Edge routers.";
    }

    identity direct {
        base routing-protocol-type;
        description
         "Identity for direct protocol type.
        .";
    }

    identity protocol-type {
        description
         "Base identity for protocol field type.";
    }

    identity tcp {
        base protocol-type;
        description
         "TCP protocol type.";
    }
    identity udp {
        base protocol-type;
        description
         "UDP protocol type.";
    }
    identity icmp {
        base protocol-type;
        description
         "icmp protocol type.";
    }
    identity icmp6 {
        base protocol-type;
        description
         "icmp v6 protocol type.";
    }
    identity gre {
        base protocol-type;
        description
         "GRE protocol type.";
    }
    identity ipip {
        base protocol-type;
        description
         "IPinIP protocol type.";
    }
    identity hop-by-hop {
        base protocol-type;
        description

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         "Hop by Hop IPv6 header type.";
    }
    identity routing {
        base protocol-type;
        description
         "Routing IPv6 header type.";
    }
    identity esp {
        base protocol-type;
        description
         "ESP header type.";
    }
    identity ah {
        base protocol-type;
        description
         "AH header type.";
    }

    /* Groupings */

    grouping vpn-service-cloud-access {
        list cloud-access {
            if-feature cloud-access;
            key cloud-identifier;

            leaf cloud-identifier {
                type string;
                description
                 "Identification of cloud service. Local
                 admin meaning.";
            }
            list authorized-sites {
                key site-id;

                leaf site-id {
                    type leafref {
                        path "/l3vpn-svc/sites/site/site-id";
                    }
                    description
                     "Site ID.";
                }
                description

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                 "List of authorized sites.";
            }
            list denied-sites {
                key site-id;

                leaf site-id {
                    type leafref {
                        path "/l3vpn-svc/sites/site/site-id";
                    }
                    description
                     "Site ID.";
                }
                description
                 "List of denied sites.";
            }
            leaf nat-enabled {
                type boolean;
                description
                 "Control if NAT is required or not.";
            }
            leaf customer-nat-address {
                type inet:ipv4-address;
                description
                 "NAT address to be used in case of public
                 or shared cloud.
                 This is to be used in case customer is providing
                 the public address.";
            }
            description
             "Cloud access configuration.";
        }
        description
         "grouping for vpn cloud definition";
    }

    grouping multicast-rp-group-cfg {
        choice group-format {
            case startend {
                leaf group-start {
                    type inet:ip-address;
                    description
                     "First group address.";
                }
                leaf group-end {
                    type inet:ip-address;
                    description
                     "Last group address.";
                }

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            }
            case singleaddress {
                leaf group-address {
                    type inet:ip-address;
                    description
                     "Group address";
                }
            }
            description
             "Choice for group format.";
        }
        description
         "Definition of groups for
         RP to group mapping.";
    }

    grouping vpn-service-multicast {
        container multicast {
            if-feature multicast;
            leaf enabled {
                type boolean;
                default false;
                description
                 "Enable multicast.";
            }
            container customer-tree-flavors {
                list tree-flavor {
                    key type;

                    leaf type {
                        type identityref {
                            base multicast-tree-type;
                        }
                        description
                         "Type of tree to be used.";
                    }
                    description
                     "List of tree flavors.";
                }
                description
                 "Type of trees used by customer.";
            }
            container rp {
                container rp-group-mappings {
                    list rp-group-mapping {
                        key "id";

                        leaf id {

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                            type uint16;
                            description
                             "Unique identifier for the mapping.";
                        }
                        container provider-managed {
                            leaf enabled {
                                type boolean;
                                default false;
                                description
                                 "Set to true, if the RP must be a
                                 provider
                                 managed node.
                                 Set to false, if it is a customer
                                 managed node.";
                            }

                            leaf rp-redundancy {
                                when "../enabled = true" {
                                    description
                                     "Relevant when RP
                                     is provider managed.";
                                }
                                type boolean;
                                default false;
                                description
                                 "If true, redundancy
                                 mechanism for RP is required.";
                            }
                            leaf optimal-traffic-delivery {
                                when "../enabled = true" {
                                    description
                                     "Relevant when RP
                                     is provider managed.";
                                }
                                type boolean;
                                default false;
                                description
                                 "If true, SP must ensure
                                 that traffic uses an optimal path.";
                            }
                            description
                             "Parameters for provider managed RP.";
                        }

                        leaf rp-address {
                            when "../provider-managed/enabled=false" {
                                description
                                 "Relevant when RP

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                                 is provider managed.";
                            }
                            type inet:ip-address;
                            description
                            "Defines the address of the
                            RendezvousPoint.
                            Used if RP is customer managed.";
                        }

                        container groups {
                            list group {
                                key id;

                                leaf id {
                                    type uint16;
                                    description
                                     "Identifier for the group.";
                                }
                                uses multicast-rp-group-cfg;
                                description
                                "List of groups.";
                            }
                            description
                             "Multicast groups associated with RP.";
                        }

                        description
                         "List of RP to group mappings.";
                    }
                    description
                    "RP to group mappings.";
                }
                container rp-discovery {
                    leaf rp-discovery-type {
                        type identityref {
                            base multicast-rp-discovery-type;
                        }
                        default static-rp;
                        description
                         "Type of RP discovery used.";
                    }
                    container bsr-candidates {
                        when "../rp-discovery-type=bsr-rp" {
                            description
                             "Only applicable if discovery type
                             is BSR-RP";
                        }
                        list bsr-candidate {

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                            key address;

                            leaf address {
                                type inet:ip-address;
                                description
                                 "Address of BSR candidate";
                            }

                            description
                             "List of customer BSR candidates";
                        }
                        description
                         "Customer BSR candidates address";
                    }
                    description
                     "RP discovery parameters";
                }

                description
                 "RendezvousPoint parameters.";
            }
            description
                "Multicast global parameters for the VPN service.";
        }
        description
         "grouping for multicast vpn definition";
    }

    grouping vpn-service-mpls {
        leaf carrierscarrier {
            if-feature carrierscarrier;
            type boolean;
            default false;
            description
             "The VPN is using Carrier's Carrier,
             and so MPLS is required.";
        }
        description
         "grouping for mpls CsC definition";
    }

    grouping customer-location-info {
        container location {
                leaf address {
                    type string;
                    description
                    "Address (number and street)

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                    of the site.";

                }
                leaf zip-code {
                    type string;
                    description
                    "ZIP code of the site.";
                }
                leaf state {
                    type string;
                    description
                    "State of the site.
                    This leaf can also be used
                    to describe a region
                    for country who does not have
                    states.
                    ";
                }
                leaf city {
                    type string;
                    description
                     "City of the site.";
                }
                leaf country-code {
                    type string;
                    description
                     "Country of the site.";
                }
                description
                    "Location of the site.";
        }
        description
         "This grouping defines customer location
          parameters";
    }

    grouping site-diversity {
        container site-diversity {
                if-feature site-diversity;
                leaf type {
                    type placement-diversity;
                    default "non-diverse";
                    description
                     "Diversity constraint type.";
                }

                leaf-list site-group {
                    type uint32;

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                    description
                     "IDs of group.";
                }
                description
                     "Diversity constraint type.";
            }
        description
         "This grouping defines site diversity
          parameters";
    }
    grouping access-diversity {
        container access-diversity {
                if-feature site-diversity;
                leaf type {
                    type placement-diversity;
                    default "pe-diverse";
                    description
                     "Diversity constraint type.";
                }
                description
                     "Diversity constraint type.";
            }
        description
         "This grouping defines access diversity
          parameters";
    }

    grouping operational-requirements {
          leaf requested-site-start {
               type yang:date-and-time;
               description
                "Optional leaf indicating requested date
                and time
                when the service at a particular site is
                expected
                to start";
           }

           leaf requested-site-stop {
               type yang:date-and-time;
               description
                "Optional leaf indicating requested date
                and time
                when the service at a particular site is
                expected
                to stop";
           }

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           leaf actual-site-start {
               type yang:date-and-time;
               description
                "Optional leaf indicating actual date
                and time
                when the service at a particular site
                actually
                started";
           }
           leaf actual-site-stop {
               type yang:date-and-time;
               description
                "Optional leaf indicating actual date
                and time
                when the service at a particular site
                actually
                stopped";
           }
        description
         "This grouping defines some operational parameters
          parameters";
    }

    grouping flow-definition {
        container match-flow {
            leaf dscp {
                type uint8 {
                    range "0 .. 63";
                }
                description
                 "DSCP value.";
            }
            leaf tos {
                type uint8 {
                    range "0 .. 254";
                }
                description
                 "TOS value.";
            }
            leaf dot1p {
                type uint8 {
                    range "0 .. 7";
                }
                description
                "802.1p matching.";
            }
            leaf ipv4-src-prefix {

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                type inet:ipv4-prefix;
                description
                 "Match on IPv4 src address.";
            }
            leaf ipv6-src-prefix {
                type inet:ipv6-prefix;
                description
                 "Match on IPv6 src address.";
            }
            leaf ipv4-dst-prefix {
                type inet:ipv4-prefix;
                description
                 "Match on IPv4 dst address.";
            }
            leaf ipv6-dst-prefix {
                type inet:ipv6-prefix;
                description
                 "Match on IPv6 dst address.";
            }
            leaf l4-src-port {
                type uint16;
                description
                 "Match on layer 4 src port.";
            }
            leaf l4-dst-port {
                type uint16;
                description
                 "Match on layer 4 dst port.";
            }
            leaf protocol-field {
                type union {
                    type uint8;
                    type identityref {
                        base protocol-type;
                    }
                }
                description
                 "Match on IPv4 protocol or
                  Ipv6 Next Header
                 field.";
            }

            description
             "Describe flow matching
             criterions.";
        }
        description
         "Flow definition based on criteria.";

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    }
    grouping site-service-basic {
        leaf svc-input-bandwidth {
               type uint32;
               units bps;
               description
                "From the PE perspective, the service input
                bandwidth of the connection.";
        }
        leaf svc-output-bandwidth {
           type uint32;
           units bps;
           description
            "From the PE perspective, the service output
            bandwidth of the connection.";
        }
        leaf svc-mtu {
            type uint16;
            units bytes;
            description
             "MTU at service level.
             If the service is IP,
             it refers to the IP MTU.";
        }
        description
         "Defines basic service parameters for a site.";
    }
    grouping site-access-protection {
        container traffic-protection {
            if-feature fast-reroute;
            leaf enabled {
                type boolean;
                description
                 "Enables
                 traffic protection of access link.";
            }

            description
             "Fast reroute service parameters
             for the site.";
        }
        description
         "Defines protection service parameters for a site.";
    }
    grouping site-service-mpls {
        container carrierscarrier {
            if-feature carrierscarrier;
            leaf signalling-type {

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                type enumeration {
                    enum "ldp" {
                        description
                            "Use LDP as signalling
                            protocol between PE and CE.";
                    }
                    enum "bgp" {
                        description
                            "Use BGP 3107 as signalling
                            protocol between PE and CE.
                            In this case, bgp must be also
                            configured
                            as routing-protocol.
                            ";
                    }
                }
                description
                 "MPLS signalling type.";
            }
            description
             "This container is used when customer provides
             MPLS based services.
             This is used in case of Carrier's
             Carrier.";
        }
        description
         "Defines MPLS service parameters for a site.";
    }
    grouping site-service-qos-profile {
        container qos {
            if-feature qos;
            container qos-classification-policy {
                list rules {
                    key id;
                    ordered-by user;

                    leaf id {
                        type uint16;
                        description
                         "ID of the rule.";
                    }

                    choice match-type {
                        case flow {
                            uses flow-definition;
                        }
                        case match-application {
                            leaf application {

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                                type identityref {
                                    base customer-application;
                                }
                                description
                                 "Defines the application
                                 to match.";
                            }
                        }
                        description
                         "Choice for classification";
                    }

                    leaf target-class-id {
                        type string;
                        description
                         "Identification of the
                         class of service.
                         This identifier is internal to
                         the administration.";
                    }

                    description
                     "List of marking rules.";
                }
                description
                 "Need to express marking rules ...";
            }
            container qos-profile {

                choice qos-profile {
                    description
                     "Choice for QoS profile.
                     Can be standard profile or custom.";
                    case standard {
                        leaf profile {
                            type string;
                            description
                             "QoS profile to be used";
                        }
                    }
                    case custom {
                        container classes {
                            if-feature qos-custom;
                            list class {
                                key class-id;

                                leaf class-id {
                                    type string;

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                                    description
                                     "Identification of the
                                     class of service.
                                     This identifier is internal to
                                     the administration.";
                                }
                                leaf rate-limit {
                                    type uint8;
                                    units percent;
                                    description
                                     "To be used if class must
                                     be rate
                                     limited. Expressed as
                                     percentage of the svc-bw.";
                                }
                                leaf priority-level {
                                    type uint8;
                                    description
                                     "Defines the level of the
                                     class in
                                     term of priority queueing.
                                      The higher the level is the
                                      higher
                                      is the priority.";
                                }
                                leaf guaranteed-bw-percent {
                                    type uint8;
                                    units percent;
                                    description
                                     "To be used to define the
                                     guaranteed
                                     BW in percent of the svc-bw
                                     available at the priority-level.";
                                }
                                description
                                 "List of class of services.";
                            }
                            description
                                 "Container for
                                 list of class of services.";
                        }

                    }

                }
                description
                "Qos profile configuration.";
            }

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            description
             "QoS configuration.";
        }
        description
         "This grouping defines QoS parameters
         for a site";

    }

    grouping site-security-authentication {
        container authentication {
            description
             "Authentication parameters";
        }
        description
         "This grouping defines authentication
         parameters
         for a site";

    }
    grouping site-security-encryption {
        container encryption {
            if-feature encryption;
            leaf enabled {
                type boolean;
                description
                 "If true, access encryption is required.";
            }
            leaf layer {
                type enumeration {
                    enum layer2 {
                        description
                         "Encryption will occur at layer2.";
                    }
                    enum layer3 {
                        description
                         "IPSec is requested.";
                    }
                }
                description
                 "Layer on which encryption is applied.";
            }
            container encryption-profile {
                choice profile {
                    case provider-profile {
                        leaf profile-name {
                            type string;
                            description

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                             "Name of the SP profile
                             to be applied.";
                        }
                    }
                    case customer-profile {
                        leaf algorithm {
                            type string;
                            description
                             "Encryption algorithm to
                             be used.";
                        }
                        choice key-type {
                            case psk {
                                leaf preshared-key {
                                    type string;
                                    description
                                     "Key coming from
                                     customer.";
                                }
                            }
                            case pki {

                            }
                            description
                             "Type of keys to be used.";
                        }
                    }
                    description
                     "Choice of profile.";
                }
                description
                 "Profile of encryption to be applied.";
            }
            description
             "Encryption parameters.";
        }
        description
         "This grouping defines encryption parameters
         for a site";
    }

    grouping site-attachment-bearer {
        container bearer {
            container requested-type {
                if-feature requested-type;
                leaf requested-type {
                    type string;

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                    description
                     "Type of requested bearer Ethernet, DSL,
                     Wireless ...
                     Operator specific.";
                }
                leaf strict {
                    type boolean;
                    default false;
                    description
                     "define if the requested-type is a preference
                     or a strict requirement.";
                }
                description
                 "Container for requested type.";
            }
            leaf always-on {
                if-feature always-on;
                type boolean;
                default true;
                description
                "Request for an always on access type.
                This means no Dial access type for
                example.";
            }
            leaf bearer-reference {
                if-feature bearer-reference;
                type string;
                description
                 "This is an internal reference for the
                 service provider.
                 Used ";
            }
            description
             "Bearer specific parameters.
             To be augmented.";
        }
        description
         "Defines physical properties of
         a site attachment.";
    }

    grouping site-routing {
        container routing-protocols {
            list routing-protocol {
                key type;

                leaf type {
                    type identityref {

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                        base routing-protocol-type;
                    }
                    description
                     "Type of routing protocol.";
                }

                container ospf {
                    when "../type = 'ospf'" {
                        description
                         "Only applies
                         when protocol is OSPF.";
                    }
                    if-feature rtg-ospf;
                    leaf-list address-family {
                        type identityref {
                            base address-family;
                        }
                        description
                         "Address family to be activated.";
                    }
                    leaf area-address {
                        type yang:dotted-quad;
                        description
                         "Area address.";
                    }
                    leaf metric {
                        type uint16;
                        description
                         "Metric of PE-CE link.";
                    }
                    container sham-links {
                        if-feature rtg-ospf-sham-link;
                        list sham-link {
                            key target-site;

                            leaf target-site {
                                type svc-id;
                                description
                                 "Target site for the sham link
                                  connection.
                                  The site is referred through it's ID.";
                            }
                            leaf metric {
                                type uint16;
                                description
                                 "Metric of the sham link.";
                            }

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                            description
                             "Creates a shamlink with another
                             site";
                        }
                        description
                         "List of Sham links";
                    }
                    description
                     "OSPF specific configuration.";
                }

                container bgp {

                    when "../type = 'bgp'" {
                        description
                         "Only applies when
                         protocol is BGP.";
                    }
                    if-feature rtg-bgp;
                    leaf autonomous-system {
                        type uint32;
                        description
                         "AS number.";
                    }
                    leaf-list address-family {
                        type identityref {
                            base address-family;
                        }
                        description
                         "Address family to be activated.";
                    }
                    description
                     "BGP specific configuration.";
                }
                container static {
                    when "../type = 'static'" {
                        description
                         "Only applies when protocol
                         is static.";
                    }

                    container cascaded-lan-prefixes {
                        list ipv4-lan-prefixes {
                            if-feature ipv4;
                            key "lan next-hop";

                            leaf lan {
                                type inet:ipv4-prefix;

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                                description
                                 "Lan prefixes.";
                            }
                            leaf lan-tag {
                                type string;
                                description
                                 "Internal tag to be used in vpn
                                 policies.";
                            }
                            leaf next-hop {
                                type inet:ipv4-address;
                                description
                                 "Nexthop address to use at customer
                                 side.";
                            }
                            description "
                                List of LAN prefixes for
                                the site.
                                ";
                        }
                        list ipv6-lan-prefixes {
                            if-feature ipv6;
                            key "lan next-hop";

                            leaf lan {
                                type inet:ipv6-prefix;
                                description
                                 "Lan prefixes.";
                            }
                            leaf lan-tag {
                                type string;
                                description
                                 "Internal tag to be used
                                 in vpn policies.";
                            }
                            leaf next-hop {
                                type inet:ipv6-address;
                                description
                                 "Nexthop address to use at
                                 customer side.";
                            }
                            description "
                                List of LAN prefixes for the site.
                                ";
                        }
                        description
                            "LAN prefixes from the customer.";
                    }

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                    description
                     "Static routing
                     specific configuration.";
                }
                container rip {

                    when "../type = 'rip'" {
                        description
                         "Only applies when
                         protocol is RIP.";
                    }
                    if-feature rtg-rip;
                    leaf-list address-family {
                        type identityref {
                            base address-family;
                        }
                        description
                         "Address family to be
                         activated.";
                    }

                    description
                     "RIP routing specific
                     configuration.";
                }

                container vrrp {

                    when "../type = 'vrrp'" {
                        description
                         "Only applies when
                         protocol is VRRP.";
                    }
                    if-feature rtg-vrrp;
                    leaf-list address-family {
                        type identityref {
                            base address-family;
                        }
                        description
                         "Address family to be activated.";
                    }
                    description
                     "VRRP routing specific configuration.";
                }

                description

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                 "List of routing protocols used
                 on the site.
                 Need to be augmented.";
            }
            description
             "Defines routing protocols.";
        }
        description
         "Grouping for routing protocols.";
    }

    grouping site-attachment-ip-connection {
        container ip-connection {
            container ipv4 {
                if-feature ipv4;
                leaf address-allocation-type {
                    type identityref {
                        base address-allocation-type;
                    }
                    default "l3vpn-svc:static-address";
                    description
                     "Defines how addresses are allocated.
                     ";
                }

                container addresses {
                    when
                    "../address-allocation-type = 'l3vpn-svc:static-address'" {
                        description
                         "Only applies when
                         protocol allocation type is static";
                    }
                    leaf provider-address {
                        type inet:ipv4-address;
                        description
                         "Provider side address.";
                    }
                    leaf customer-address {
                        type inet:ipv4-address;
                        description
                         "Customer side address.";
                    }
                    leaf mask {
                        type uint8 {
                            range "0..32";
                        }
                        description
                         "Subnet mask expressed

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                         in bits";
                    }
                    description
                     "Describes IP addresses used";
                }

                description
                 "IPv4 specific parameters";

            }
            container ipv6 {
                if-feature ipv6;
                leaf address-allocation-type {
                    type identityref {
                        base address-allocation-type;
                    }
                    default "l3vpn-svc:static-address";
                    description
                     "Defines how addresses are allocated.
                     ";
                }

                container addresses {
                    when
                    "../address-allocation-type = 'l3vpn-svc:static-address'" {
                        description
                         "Only applies when
                         protocol allocation type is static";
                    }
                    leaf provider-address {
                        type inet:ipv6-address;
                        description
                         "Provider side address.";
                    }
                    leaf customer-address {
                        type inet:ipv6-address;
                        description
                         "Customer side address.";
                    }
                    leaf mask {
                        type uint8 {
                            range "0..128";
                        }
                        description
                         "Subnet mask expressed
                         in bits";
                    }

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                    description
                     "Describes IP addresses used";
                }

                description
                 "IPv6 specific parameters";

            }
            container oam {
                container bfd {
                    if-feature bfd;
                    leaf bfd-enabled {
                        type boolean;
                        description
                         "BFD activation";
                    }

                    choice holdtime {
                        case profile {
                            leaf profile-name {
                                type string;
                                description
                                 "Service provider well
                                 known profile.";
                            }
                            description
                                 "Service provider well
                                 known profile.";
                        }
                        case fixed {
                            leaf fixed-value {
                                type uint32;
                                units msec;
                                description
                                 "Expected holdtime
                                 expressed
                                 in msec.";
                            }
                        }
                        description
                         "Choice for holdtime flavor.";
                    }
                    description
                     "Container for BFD.";
                }
                description
                 "Define the OAM used on the connection.";
            }

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            description
             "Defines connection parameters.";
        }
        description
         "This grouping defines IP connection parameters.";
    }

    grouping site-service-multicast {
        container multicast {
            if-feature multicast;
            leaf multicast-site-type {
                type enumeration {
                    enum receiver-only {
                        description
                         "The site has only receivers.";
                    }
                    enum source-only {
                        description
                         "The site has only sources.";
                    }
                    enum source-receiver {
                        description
                         "The site has both
                         sources & receivers.";
                    }
                }
                default "source-receiver";
                description
                 "Type of multicast site.";
            }
            container multicast-transport-protocol {
                leaf ipv4 {
                    if-feature ipv4;
                    type boolean;
                    default true;
                    description
                        "Enables ipv4 multicast transport";
                }
                leaf ipv6 {
                    if-feature ipv6;
                    type boolean;
                    default false;
                    description
                        "Enables ipv6 multicast transport";
                }
                description
                 "Defines protocol to transport multicast.";
            }

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            leaf protocol-type {
                type enumeration {
                    enum host {
                        description
                         "
                         Hosts are directly connected
                         to the provider network.
                         Host protocols like IGMP, MLD
                         are required.
                         ";
                    }
                    enum router {
                        description
                         "
                         Hosts are behind a customer router.
                         PIM will be implemented.
                         ";
                    }
                    enum both {
                        description
                         "Some Hosts are behind a customer
                         router and some others are directly
                         connected to the provider network.
                         Both host and routing protocols must be
                         used. Typically IGMP and PIM will be
                         implemented.
                         ";
                    }
                }
                default "both";
                description
                 "Multicast protocol type to be used
                 with the customer site.";
            }

            description
             "Multicast parameters for the site.";
        }
        description
          "Multicast parameters for the site.";
    }

    grouping site-management {
        container management {
            leaf type {
                type identityref {
                    base management;
                }

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                description
                "Management type of the connection.";
            }
            leaf management-transport {
                type identityref {
                    base address-family;
                }
                description
                 "Transport protocol used for management.";
            }
            leaf address {
                type inet:ip-address;
                description
                 "Management address";
            }

            description
             "Management configuration";
        }
        description
          "Management parameters for the site.";
    }

    grouping site-vpn-flavor {
        leaf site-vpn-flavor {
            type identityref {
                base site-vpn-flavor;
            }
            default site-vpn-flavor-single;
            description
             "Defines if the site
            is a single VPN site, or multiVPN or ...";
        }
        description
         "Grouping for site-vpn-flavor.";
    }

    grouping site-vpn-policy {
        container vpn-policy-list {
            list vpn-policy {
                key vpn-policy-id;

                leaf vpn-policy-id {
                    type svc-id;
                    description
                     "Unique identifier for
                     the VPN policy.";
                }

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                list entries {
                    key id;

                    leaf id {
                            type svc-id;
                            description
                             "Unique identifier for
                              the policy entry.";
                    }
                    container filter {
                        choice lan {
                            case lan-prefix {
                                container lan-prefixes {
                                    list ipv4-lan-prefixes {
                                        if-feature ipv4;
                                        key lan;

                                        leaf lan {
                                            type inet:ipv4-prefix;
                                            description
                                             "Lan prefixes.";
                                        }
                                        description "
                                            List of LAN prefixes
                                            for the site.
                                            ";
                                    }
                                    list ipv6-lan-prefixes {
                                        if-feature ipv6;
                                        key lan;

                                        leaf lan {
                                            type inet:ipv6-prefix;
                                            description
                                             "Lan prefixes.";
                                        }
                                        description "
                                            List of LAN prefixes
                                            for the site.
                                            ";
                                    }
                                    description
                                     "LAN prefixes from the customer.";
                                }
                            }
                            case lan-tag {
                                leaf-list lan-tag {
                                    type string;

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                                    description
                                     "List of lan-tags to be matched.";
                                }
                            }
                            description
                             "Choice for LAN matching type";
                        }
                        description
                         "If used, it permit to split site LANs
                         among multiple VPNs.
                         If no filter used, all the LANs will be
                         part of the same VPNs with the same
                         role.";
                    }
                    container vpn {
                        leaf vpn-id {
                            type leafref {
                                path "/l3vpn-svc/vpn-services/vpn-svc/vpn-id";
                            }
                            mandatory true;
                            description
                             "Reference to an IPVPN.";
                        }
                        leaf site-role {
                            type identityref {
                                base site-role;
                            }
                            mandatory true;
                            description
                             "Role of the site in the IPVPN.";
                        }
                        description
                         "List of VPNs the LAN is associated to.";
                    }
                    description
                     "List of entries for export policy.";
                }
                description
                 "List of VPN policies.";
            }
            description
                 "VPN policy.";
        }
        description
          "VPN policy parameters for the site.";
    }

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    grouping site-maximum-routes {
        container maximum-routes {
            list address-family {
                key af;

                leaf af {
                    type identityref {
                        base address-family;
                    }
                    description
                     "Address-family.";
                }
                leaf maximum-routes {
                    type uint32;
                    description
                     "Maximum prefixes the VRF can
                     accept for this
                     address-family.";
                }
                description
                 "List of address families.";
            }

            description
             "Define maximum-routes for the VRF.";
        }
        description
        "Define maximum-routes for the site.";
    }

    grouping site-security {
        container security {
            uses site-security-authentication;
            uses site-security-encryption;

            description
             "Site specific security parameters.";
        }
        description
         "Grouping for security parameters.";
    }

    grouping site-service {
        container service {
            uses site-service-basic;
            uses site-service-qos-profile;
            uses site-service-mpls;
            uses site-service-multicast;

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            description
             "Service parameters on the attachement.";
        }
        description
         "Grouping for service parameters.";
    }

    grouping transport-constraint {
        list constraint-list {
            key constraint-type;

            leaf constraint-type {
                type identityref {
                    base transport-constraint;
                }
                description
                 "Constraint type to be applied.";
            }
            leaf constraint-opaque-value {
                type string;
                description
                "Opaque value that can be used to
                specify constraint parameters.";
            }
            description
             "List of constraints";
        }
        description
         "Grouping for transport constraint.";
    }

    grouping transport-constraints {
        container transport-constraints {
            if-feature traffic-engineering;
            container unicast-transport-constraints {
                list constraints {
                    key constraint-id;

                    leaf constraint-id {
                        type svc-id;
                        description
                         "Defines an ID for the constraint
                         rule.";
                    }

                    leaf site1 {
                        type svc-id;
                        description

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                         "The ID refers to one site end.";
                    }
                    leaf site2 {
                        type svc-id;
                        description
                         "The ID refers to the other
                         site end.";
                    }
                    uses transport-constraint;
                    description
                     "List of constraints.
                     Constraints are bidirectional.";
                }
                description
                 "Unicast transport constraints.";
            }
            container multicast-transport-constraints {
                if-feature traffic-engineering-multicast;
                list constraints {
                    key constraint-id;

                    leaf constraint-id {
                        type svc-id;
                        description
                         "Defines an ID for the constraint
                         rule.";
                    }

                    leaf src-site {
                        type svc-id;
                        description
                         "The ID refers to source site.";
                    }
                    leaf dst-site {
                        type svc-id;
                        description
                         "The ID refers to the receiver
                         site.";
                    }
                    uses transport-constraint;
                    description
                     "List of constraints.
                     Constraints are unidirectional.";
                }
                description
                 "Multicast transport constraints.";
            }
            description

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                 "transport constraints.";
        }
        description
         "Grouping for transport constraints
         description.";
    }

    grouping vpn-extranet {
        container extranet-vpns {
            if-feature extranet-vpn;
            list extranet-vpn {
                key vpn-id;

                leaf vpn-id {
                    type svc-id;
                    description
                        "Identifies the target VPN";
                }
                leaf local-sites-role {
                    type identityref {
                        base site-role;
                    }
                    description
                     "This describes the role of the
                     local sites in the target VPN topology.";
                }
                description
                 "List of extranet VPNs the local
                 VPN is attached to.";
            }
            description
             "Container for extranet vpn cfg.";
        }
        description
            "grouping for extranet VPN configuration.
            Extranet provides a way to interconnect all sites
            from two VPNs in a easy way.";

    }

    grouping site-attachment-availability {
        container availability {
            uses site-access-protection;
            leaf access-priority {
                type uint32;
                default 1;
                description
                 "Defines the priority for the access.

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                 The highest the priority value is,
                 the highest the
                 preference of the access is.";
            }
            description
             "Availability parameters
             (used for multihoming)";
        }
        description
         "Defines site availability parameters.";
    }

    grouping access-vpn-policy {
        container vpn-attachment {

            choice attachment-flavor {
                case vpn-policy-id {
                    leaf vpn-policy-id {
                        type leafref {
                            path "/l3vpn-svc/sites/site/"+
                            "vpn-policy-list/vpn-policy/"+
                            "vpn-policy-id";
                        }
                        description
                         "Reference to a VPN policy.";
                    }
                }
                case vpn-id {
                    leaf vpn-id {
                        type leafref {
                            path "/l3vpn-svc/vpn-services"+
                            "/vpn-svc/vpn-id";
                        }
                        description
                            "Reference to a VPN.";
                    }
                    leaf site-role {
                        type identityref {
                                base site-role;
                            }
                        mandatory true;
                        description
                         "Role of the site in the IPVPN.";
                    }
                }
                mandatory true;
                description
                 "Choice for VPN attachment flavor.";

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            }
            description
             "Defines VPN attachment of a site.";
        }
        description
         "Defines the VPN attachment rules
         for a site logical access.";
    }

    grouping vpn-svc-cfg {
        leaf vpn-id {
                type svc-id;
                description
                "VPN identifier. Local administration meaning.";
            }
        leaf customer-name {
            type string;
            description
             "Name of the customer.";
        }
        leaf topology {
            type identityref {
                base vpn-topology;
            }
            default "any-to-any";
            description
             "VPN topology.";
        }

        uses vpn-service-cloud-access;
        uses vpn-service-multicast;
        uses vpn-service-mpls;
        uses transport-constraints;
        uses vpn-extranet;

        description
         "grouping for vpn-svc configuration.";
    }

    grouping site-top-level-cfg {
        uses operational-requirements;
        uses customer-location-info;
        uses site-diversity;
        uses site-management;
        uses site-vpn-policy;
        uses site-vpn-flavor;
        uses site-maximum-routes;
        uses site-security;

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        uses site-service;
        uses site-routing;

        description
         "Grouping for site top level cfg.";
    }
    grouping site-network-access-top-level-cfg {
        uses access-diversity;
        uses site-attachment-bearer;
        uses site-attachment-ip-connection;
        uses site-security;
        uses site-service;
        uses site-routing;
        uses site-attachment-availability;
        uses access-vpn-policy;

        description
         "Grouping for site network access
         top level cfg.";
    }

    /* Main blocks */

    container l3vpn-svc {
        container vpn-services {
            list vpn-svc {
                key vpn-id;

                uses vpn-svc-cfg;

                description "
                    List of VPN services.
                ";
            }
            description
             "top level container
             for the VPN services.";
        }

        container sites {
            list site {
                key site-id;

                leaf site-id {
                    type svc-id;
                    description
                        "Identifier of the site.";
                }

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                leaf apply-template {
                    type leafref {
                        path "/l3vpn-svc/site-templates"+
                        "/site-template/site-template-id";
                    }
                    description
                     "Reference to template to be applied.
                     The template is called through it's ID.";
                }

                uses site-top-level-cfg;

                container site-network-accesses {
                    list site-network-access {
                        key site-network-access-id;

                        leaf site-network-access-id {
                            type svc-id;
                            description
                             "Identifier for the access";
                        }
                        leaf apply-template {
                            type leafref {
                                path "/l3vpn-svc/site-templates/"+
                                "site-template/site-template-id";
                            }
                            description
                             "Reference to template to be applied.
                             The template is called through it's ID.";
                        }
                        uses site-network-access-top-level-cfg;

                        description
                         "List of accesses for a site.";
                    }
                    description
                     "List of accesses for a site.";
                }

                description "List of sites.";
            }
            description
             "Container for sites";
        }

        container site-templates {
            list site-template {
                key site-template-id;

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                leaf site-template-id {
                    type template-id;
                    description
                        "Identifier of the site.";
                }

                uses site-top-level-cfg;

                container site-network-access {
                    uses site-network-access-top-level-cfg;
                    description
                     "Container for the site-network-access.";
                }

                description "List of sites.";
            }
            description "Container for site templates";
        }

        description
         "Main container for L3VPN service configuration.";
    }

}
<CODE ENDS>

9.  Security Considerations

   The YANG modules defined in this document MAY be accessed via the
   RESTCONF protocol [I-D.ietf-netconf-restconf] or NETCONF protocol
   ([RFC6241].  The lowest RESTCONF or NETCONF layer requires that the
   transport-layer protocol provides both data integrity and
   confidentiality, see Section 2 in [I-D.ietf-netconf-restconf] and
   [RFC6241].  The client MUST carefully examine the certificate
   presented by the server to determine if it meets the client's
   expectations, and the server MUST authenticate client access to any
   protected resource.  The client identity derived from the
   authentication mechanism used is subject to the NETCONF Access
   Control Module (NACM) ([RFC6536]).  Other protocols to access this
   YANG module are also required to support the similar mechanism.

   The data nodes defined in the "ietf-l3vpn-svc" YANG module MUST be
   carefully created/read/updated/deleted.  The entries in the lists
   below include customer proprietary or confidential information,
   therefore only authorized clients MUST access the information and the
   other clients MUST NOT be able to access to the information.

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   o  /l3vpn-svc/vpn-services/vpn-svc

   o  /l3vpn-svc/sites/site

   o  /l3vpn-svc/site-templates/site-template

10.  Acknowledgements

   Thanks to Qin Wu, Maxim Klyus, Luis Miguel Contreras, Gregory Mirsky,
   Zitao Wang, Jing Zhao, Kireeti Kompella, Eric Rosen, Aijun Wang,
   Michael Scharf, Xufeng Liu and Andrew Leu for the contributions to
   the document.

11.  IANA Considerations

   The IANA is requested to assign a new URI from the IETF XML registry
   ([RFC3688]).  Authors are suggesting the following URI :

       URI: urn:ietf:params:xml:ns:yang:ietf-l3vpn-svc
       Registrant Contact: L3SM WG
       XML: N/A, the requested URI is an XML namespace

   This document also requests a new YANG module name in the YANG Module
   Names registry ([RFC6020]) with the following suggestion :

       name: ietf-l3vpn-svc
       namespace: urn:ietf:params:xml:ns:yang:ietf-l3vpn-svc
       prefix: l3vpn-svc
       reference: RFC XXXX

12.  References

12.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/
              RFC2119, March 1997,
              <http://www.rfc-editor.org/info/rfc2119>.

   [RFC3688]  Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
              DOI 10.17487/RFC3688, January 2004,
              <http://www.rfc-editor.org/info/rfc3688>.

   [RFC4364]  Rosen, E. and Y. Rekhter, "BGP/MPLS IP Virtual Private
              Networks (VPNs)", RFC 4364, DOI 10.17487/RFC4364, February
              2006, <http://www.rfc-editor.org/info/rfc4364>.

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   [RFC4577]  Rosen, E., Psenak, P., and P. Pillay-Esnault, "OSPF as the
              Provider/Customer Edge Protocol for BGP/MPLS IP Virtual
              Private Networks (VPNs)", RFC 4577, DOI 10.17487/RFC4577,
              June 2006, <http://www.rfc-editor.org/info/rfc4577>.

   [RFC4862]  Thomson, S., Narten, T., and T. Jinmei, "IPv6 Stateless
              Address Autoconfiguration", RFC 4862, DOI 10.17487/
              RFC4862, September 2007,
              <http://www.rfc-editor.org/info/rfc4862>.

   [RFC6020]  Bjorklund, M., Ed., "YANG - A Data Modeling Language for
              the Network Configuration Protocol (NETCONF)", RFC 6020,
              DOI 10.17487/RFC6020, October 2010,
              <http://www.rfc-editor.org/info/rfc6020>.

   [RFC6241]  Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed.,
              and A. Bierman, Ed., "Network Configuration Protocol
              (NETCONF)", RFC 6241, DOI 10.17487/RFC6241, June 2011,
              <http://www.rfc-editor.org/info/rfc6241>.

   [RFC6513]  Rosen, E., Ed. and R. Aggarwal, Ed., "Multicast in MPLS/
              BGP IP VPNs", RFC 6513, DOI 10.17487/RFC6513, February
              2012, <http://www.rfc-editor.org/info/rfc6513>.

12.2.  Informative References

   [I-D.ietf-netconf-restconf]
              Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF
              Protocol", draft-ietf-netconf-restconf-13 (work in
              progress), April 2016.

   [RFC4110]  Callon, R. and M. Suzuki, "A Framework for Layer 3
              Provider-Provisioned Virtual Private Networks (PPVPNs)",
              RFC 4110, DOI 10.17487/RFC4110, July 2005,
              <http://www.rfc-editor.org/info/rfc4110>.

   [RFC6536]  Bierman, A. and M. Bjorklund, "Network Configuration
              Protocol (NETCONF) Access Control Model", RFC 6536, DOI
              10.17487/RFC6536, March 2012,
              <http://www.rfc-editor.org/info/rfc6536>.

Appendix A.  Example: NETCONF <get> Reply

   This section gives an example of a reply to the NETCONF <get> request
   for a device that implements the data model defined in this document.
   The example is written in XML.

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Authors' Addresses

   Stephane Litkowski
   Orange Business Services

   Email: stephane.litkowski@orange.com

   Rob Shakir
   Jive Communications

   Email: rjs@rob.sh

   Luis Tomotaki
   Verizon

   Email: luis.tomotaki@verizon.com

   Kenichi Ogaki
   KDDI

   Email: ke-oogaki@kddi.com

   Kevin D'Souza
   ATT

   Email: kd6913@att.com

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