A Yang model for I2RS service topology
draft-hares-i2rs-service-topo-dm-00
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| Document | Type | Active Internet-Draft (individual) | |
|---|---|---|---|
| Authors | Susan Hares , Linda Dunbar | ||
| Last updated | 2015-07-06 | ||
| Stream | (None) | ||
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| Send notices to | (None) |
draft-hares-i2rs-service-topo-dm-00
I2RS S. Hares
Internet-Draft Hickory Hill Consulting
Intended status: Standards Track L. Dunbar
Expires: January 7, 2016 Huawei
July 6, 2015
A Yang model for I2RS service topology
draft-hares-i2rs-service-topo-dm-00.txt
Abstract
This document defines I2RS protocol-independent service layer virtual
topology data model. This data model utilizes the concepts in the
generic I2RS topology model of virtual networks (node, links,
termination points) and cross-layer topologies. This virtual service
topology may be a composite layer created from the combination of
protocol-dependent service layers. Protocol-dependent services
layers include: L3VPN, L2VPN, EVPN, E-Tree, and others.
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
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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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material or to cite them other than as "work in progress."
This Internet-Draft will expire on January 7, 2016.
Copyright Notice
Copyright (c) 2015 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
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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 . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Conventions used in this document . . . . . . . . . . . . 2
1.2. Base Model: the Service-Topology Component . . . . . . . 2
2. High level Yang architecture . . . . . . . . . . . . . . . . 3
2.1. Network level . . . . . . . . . . . . . . . . . . . . . . 3
2.2. Node level . . . . . . . . . . . . . . . . . . . . . . . 4
2.3. Service Link and Termination point . . . . . . . . . . . 4
3. Yang Data Model . . . . . . . . . . . . . . . . . . . . . . . 5
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10
5. Security Considerations . . . . . . . . . . . . . . . . . . . 10
6. Normative References . . . . . . . . . . . . . . . . . . . . 11
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 11
1. Introduction
Service topology in [I-D.ietf-i2rs-yang-network-topo] includes the a
virtual topology for a service layer above the L1, L2, and L3 layers.
This virtual topology has the generic topology elements of node,
link, and terminating point. The virtual service topology is a
network-wide topology stored on one routing system which an I2RS
agent is connected to.
The virtual service topology is a composite of the available services
topologies IETF has standard virtual network topologies for L3VPN,
L2VPN, and EVPN services, E-TREE services, Seamless MPLS topologies
within an As and others. This yang module provides the composite
protocol independent service topology that these protocol dependent
topologies plug into
1.1. Conventions used in this document
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 [RFC2119].
1.2. Base Model: the Service-Topology Component
The following diagram contains an informal graphical depiction of the
main elements of the information model:
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+----------------+
| network |
| topology |<...
+----------------+ :
* * : :
| | :...:
| |
+--------+ +--------+
...>| node |<.......|link |<...
: +--------+<.......+--------+ :
: : * : : * : :
:..... | : : | :...:
| : : |
.....>+--------+<........: : |
: | TP |<..........: |
: ...>+--------+ |
: : |
: : .....................+---------+
.........................|Direction|
+---------+
2. High level Yang architecture
This section describes the Yang High level architecture.
2.1. Network level
The service topology network level defines the following high-level
yang architeture:
module: i2rs-service-topologies
augment /nw:network/nw:network-types:
+--rw service-topologies-types
augment /nw:network:
+--rw service-topology-attributes
+--rw name? string
+--rw flag flag_type;
+--rw composite-flag identity-ref
+--rw service-topo-id network-id
+--rw node-count uint32
+--rw composite-flag_status identity-ref
The service topology attributes for a network include the following
name - name of the service topology,
flag - generic topology flag,
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composite-flags - bit mask with flags of service layer topologies
network topology node available to create service topology from.
These topologies include: L3VPN, L2VPN, and EVPN services, E-TREE
services, Seamless MPLS topologies within an AS and others.
service-topo-id - service topology identifier.
node-count - count of nodes in composite service topology,
composite-flag_status - status flag for each of the composite
topologies on whether portions of the topology are included in the
composite.
2.2. Node level
module: i2rs-service-topologies
....
augment /nw:network/nw:node
+--rw node-service-attributes
+--rw name? inet:domain-name
+--rw composite_flag* identityref;
+--rw service-node-id uint32
+--rw node-svc_status* identityref;
The additional fields in the service attributes are the following:
name - name of network node,
flag - generic topology node flag,
service-node-id - the id for the service node in the composite
network,
node-svc-type - the type of service node. The service node can be
a member of one of the existing topology type (L3VPN, L2VPN, EVPN,
E-TREE, Seamless MPLS, MPLS-TE, MPLS node, or I2RS created).
2.3. Service Link and Termination point
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augment /nw:network/nt:link:
+--rw service-link-attributes
+--rw name? string
+--rw svc-link-type identityref
+--rw metric? uint32
augment /nw:network/nw:node/nt:termination-point:
+--rw service-termination-point-attributes
+--rw tp-svc-id
+--rw (supporting-termination-point) ()
+--:(service)
| +--rw service-network-id leafref
| +--rw service-node-id leafref
| +--rw service-tp-id leafref
+--:(ip)
| +--rw ip-address inet:ip-address
+--:(unnumbered)
+--rw unnumbered-id? uint32
The augmentation to the service topology is the service link
attributes which include:
name - name of the link,
svc-link-type - the service link type used to create this
composite service link.
metric - the metric of the service type
The augmentation to the termination point include the following
tp-svc-id - service id for the termination point,
supporting termination point* - with a)references to the service
network id, node id and termination point for service id, or b) an
ip address, or c) an unnumbered link address
3. Yang Data Model
<CODE BEGINS>
file "i2rs-service-topology@2015-07-07.yang"
module i2rs-service-topology {
yang-version 1;
namespace "urn:ietf:params:xml:ns:yang:i2rs-service-topology";
prefix "i2rs-st";
import ietf-network {
prefix "nw";
}
import ietf-network-topology {
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prefix "nt";
}
import ietf-inet-types {
prefix "inet";
}
organization "TBD";
contact "TBD";
description
"This module defines a model for the service topology.";
revision "2015-07-07" {
description "Initial revision";
reference "TBD";
}
identity svc-topo-flag-identity {
description "Base type for svc flags";
}
identity l3vpn-svc-topo {
base svc-topo-flag-identity;
description "L3VPN service type";
}
identity l2vpn-svc-topo {
base svc-topo-flag-identity;
description "L2VPN service type";
}
identity EVPN-svc-topo {
base svc-topo-flag-identity;
description "EVPN service type";
}
identity Seamless-MPLS-svc-topo {
base svc-topo-flag-identity;
description "Seamless MPLS service type";
}
identity Etree-svc-topo {
base svc-topo-flag-identity;
description "Seamless MPLS service type";
}
identity I2rs-svc-topo {
base svc-topo-flag-identity;
description "I2RS create service topo";
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}
identity svc-tp-type {
description "Base type for service
termination-point type flags";
}
identity svc-tp-type-service {
base svc-tp-type;
description "service type";
}
identity svc-tp-type-ip {
base svc-tp-type;
description "service IP";
}
identity svc-tp-type-unnum {
base svc-tp-type;
description "service unnumbered link";
}
grouping service-topology-types {
leaf service-type* {
type identityref {
base svc-topo-flag-identity;
}
description "list of topology type
supported"
}
}
grouping service-topology attributes {
description
"Grouping for the attribute for the
service topology";
leaf name {type string;
description "name of service
topology"};
leaf composite-flag {
type identityref {
base service-topology-types;}
description "other topologies
this topology is configured to
be a composite of
(L3VPN, L2VPN, I2RS only)"
}
leaf service-topo-id {
type leafref {
path "/nw:network/nw:network-id"
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}
description
"An absolute reference to a network topology instance."
}
leaf service-id-number {
type uint32;
description "ID for topology";
}
leaf node-node {
type unint32;
description "count of service level nodes
in the network."
}
leaf composite-flag-status {
type identityref {
base svc-topo-flag-identity;}
description "other topologies
this topology is currently a
composite of
(L3VPN, L2VPN, I2RS only)"
}
}
grouping node-svc-attribute {
leaf name {
type inet:domain-name;
description "Domain name for node";
}
leaf composite-flag* {
type identityref {
base svc-topo-flag-identity;}
description "virtual network
node can be composite of the
topologies list
(L3VPN, L2VPN, I2RS only)"
}
leaf service-node-id {
type uint32;
description "ID for node at
service level";
}
leaf node-svc_status {
type identityref {
base service-topology-types;}
description "other topologies
this topology is currewntly
be a composite of
(L3VPN, L2VPN, I2RS only)"
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}
}
grouping service-link-attributes {
leaf name {type string;
description "name of
service link";}
leaf link-id uint32;
leaf svc-link-type {
type identityref {
base service-topology-types;}
description "other topologies
this link is current a composite of
(L3VPN, L2VPN, I2RS only)"
}
leaf metric {
type uint32;
description "link metric";
// may need to expand with TE topologies
}
}
grouping service-termination-point-attributes {
leaf svc-tp-id {
type uint32;
description "termination point id";
}
container supporting-termination-point {
leaf svc-tp-type {
type identityref {
base svc-tp-type;}
description "other topologies
this link termination point is
part of
(L3VPN, L2VPN, I2RS only)"
choice svc-tp-type
case svc-tp-type-service {
description "network, node,
tp that supports this
termination point"
leaf service-network-id {
type uint32; }
leaf service-node-id {
type unit32;}
leaf service-link-id {
type uint32;}
}
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case svc-tp-type-inet {
leaf ip-address inet:ip-addresss;
}
case svc-tp-type-unnum {
leaf unnumbered-id {
type uint32;}}
}
}
}
augment /nw:network/nw:node
+--rw node-svc-attributes
+--rw name? inet:domain-name
+--rw composite_flag* flag-type
+--rw service-node-id uint32
+--rw node-svc-type service-type
+--rw next-hop [next-hop-id]
augment /nw:network/nw:network-types
use service-topology-types
augment /nw:network/nw:network
use service-topology-attributes
augment /nw:network/nw:node
use node-svc-attribute
augment /nw:network/nt:link:
uses service-link-attributes
augment /nw:network/nw:node/nt:termination-point:
uses service-termination-point-attributes
} // module i2rs-service-topology
<CODE BEGINS>
4. IANA Considerations
TBD
5. Security Considerations
TBD
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6. Normative References
[I-D.ietf-i2rs-yang-l3-topology]
Clemm, A., Medved, J., Varga, R., Tkacik, T., Liu, X.,
Bryskin, I., Guo, A., Ananthakrishnan, H., Bahadur, N.,
and V. Beeram, "A YANG Data Model for Layer 3 Topologies",
draft-ietf-i2rs-yang-l3-topology-00 (work in progress),
June 2015.
[I-D.ietf-i2rs-yang-network-topo]
Clemm, A., Medved, J., Varga, R., Tkacik, T., Bahadur, N.,
and H. Ananthakrishnan, "A Data Model for Network
Topologies", draft-ietf-i2rs-yang-network-topo-01 (work in
progress), June 2015.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC5511] Farrel, A., "Routing Backus-Naur Form (RBNF): A Syntax
Used to Form Encoding Rules in Various Routing Protocol
Specifications", RFC 5511, April 2009.
Authors' Addresses
Susan Hares
Hickory Hill Consulting
7453 Hickory Hill
Saline, MI 48176
USA
Email: shares@ndzh.com
Linda Dunbar
Huawei
USA
Email: linda.dunbar@huawei.com
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