Filter-Based RIB Information Model
draft-kini-i2rs-fb-rib-info-model-03

I2RS working group                                               S. Kini
Internet-Draft                                                  Ericsson
Intended status: Standards Track                                S. Hares
Expires: September 10, 2015                                       Huawei
                                                             A. Ghanwani
                                                                    Dell
                                                             R. Krishnan
                                                                 Brocade
                                                                   Q. Wu
                                                                  Huawei
                                                           D. Bogdanovic
                                                        Juniper Networks
                                                             J. Tantsura
                                                                R. White
                                                                Ericsson
                                                           March 9, 2015


                   Filter-Based RIB Information Model
                  draft-kini-i2rs-fb-rib-info-model-00

Abstract

   This document defines an information model I2RS Filter based RIB
   (Routing information Model).  Filter based forwarding matches fields
   in the IP header plus other higher layer packet information.  These
   matches may be ordered.  Matches may contain actions which could
   impact forward, such as setting a nexthop.

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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   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
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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 September 10, 2015.






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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
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Definitions and Acronyms  . . . . . . . . . . . . . . . . . .   4
   3.  Filter-Based Routing Information Model Overview . . . . . . .   5
     3.1.  Scope . . . . . . . . . . . . . . . . . . . . . . . . . .   6
     3.2.  Generic Rules for Filter-Based RIBS . . . . . . . . . . .   6
   4.  Filter-Based-RIB module . . . . . . . . . . . . . . . . . . .   9
     4.1.  FB-RIB entries  . . . . . . . . . . . . . . . . . . . . .  11
     4.2.  FB-RIB Description  . . . . . . . . . . . . . . . . . . .  12
     4.3.  Rules on Order Rule . . . . . . . . . . . . . . . . . . .  13
     4.4.  I2RS FB-RIB interaction with configured filter rules  . .  15
     4.5.  Relationship between RB-RIB Rule Model and RIB
           Information Model . . . . . . . . . . . . . . . . . . . .  15
   5.  L3 Match-Action Rules . . . . . . . . . . . . . . . . . . . .  16
   6.  Open issues . . . . . . . . . . . . . . . . . . . . . . . . .  17
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  18
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  18
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  18
     9.1.  Normative References: . . . . . . . . . . . . . . . . . .  18
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  18
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  20

1.  Introduction

   The Interface to the Routing System (I2RS)
   [I-D.ietf-i2rs-architecture] architecture provides dynamic read and
   write access to the information and state within the routing
   elements.  The I2RS client interacts with the I2RS agent in one or
   more network routing systems.






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   This document provides a generic information model for a I2RS filter
   based RIB (FB-RIB) and describes the I2RS interaction with routing
   filters within a routing element.

   Filter based (FB) routing matches fields in the IP header plus other
   higher layer packet information.  Filters with a match-action pair
   allow the filters to impact the forwarding of packets.  Actions may
   impact forwarding or set something in the packet that will impact
   forwarding.

   A Filter-Based RIB (Routing Information Base) contains a list of
   filters (match-action conditions) and a default RIB of the form found
   in [I-D.ietf-i2rs-rib-info-model].  The default RIB routes any packet
   not matched by the order list of filter rules.  If any packet does
   not match filter, it is dropped.

   Some drafts which provide models for match filters are the following:

   o  Access lists (ACLs) [I-D.ietf-netmod-acl-model] (Note: This filter
      provides match-action filters),

   o  routing filter policy based on filters for IP prefixes (IPv4,
      IPv6) (E.g.  [I-D.yan-rtgwg-routing-policy-yang]) or ordered
      prefix lists (e.g.  [I-D.zhdankin-idr-bgp-cfg]),

   o  generic match-policy filters that support QOS filters (E.g.
      [I-D.hares-i2rs-bnp-info-model]).

   o  routing filters that include BGP originated routes tracked by BGP
      attribute(asPath, BGP community, extended BGP community, RDs) or
      peer ([I-D.shaikh-rtgwg-policy-model]),

   o  Filters passed in BGP for flows (E.g.  [RFC5575]))

   This generic model for filters aligns with the generic model for
   topology in providing a simple model that can be utilize for other
   filters.  The abstract filter model utilizes a generic filter based
   model that can be applied for specific filters at each level.  The
   default RIB specification for the FB-RIB uses the I2RS RIB Model.












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                     +------------------------+
                     |                        |
                     | Abstract Network Model |
                     |                        |
                     +------------------------+
                                  |
                          +-------+-------+--
                          |               |
                          V               V
               +---------------+  +------------+  +-----------+
               |  Abstract     |  | Abstract   |  |  I2RS     |
               |  Filter-Based |  | Topology   |  |  RIB      |
               | (FB)RIB Model |  |  Model     |  |  Model    |
               +---------------+  +------------+  +-----------+
                          |
               augments   |
            +-------------+-------------+-----------+
            |             |             |           |
            V             V             V           V
      ............  ............  ............ ...........
      :    L1    :  :    L2    :  :    L3    : : Service :
      :  FB-RIB  :  :   FB-RIB :  :  FB-RIB  : : FB-RIB  :
      :   Model  :  :   Model  :  :   Model  : :  Model  :
      ''''''''''''  ''''''''''''  '''''''''''' '''''''''''

                      Figure 1: The network model structure


2.  Definitions and Acronyms

   CLI

      Command Line Interface

   FB Default RIB

      The FB Default RIB is the default Routing Information Based use
      based for forwarding traffic for routes which do not match any FB-
      RIB Rule.

   FB-RIB

      Filter-Based Routing Information Base

   IGP

      IGP is an Interior Gateway Protocol




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   PCIM

      Policy Core Information Model directly and indirectly the work of
      the PCIM Working Group.

   Policy Rule

      The PCIM framework defines a policy rule is often represented by
      "if Condition then action".  The action may have set, modify, or
      notify actions.  This draft uses the filters in
      [I-D.hares-i2rs-bnp-info-model], but policy can be used from a
      variety of filters.

   Policy Group

      The PCIM Framework defines policy groups as a group of policy
      rules into ordered and prioritized groups of policy.

   Policy Set

      The PCIM framework defines a the Policy set (specifically the
      PolicySetComponent) as an aggregation class that allows
      aggregation of Policy Groups and the nesting of Policy Groups
      under Policy set rules.  The PolicySet rules include nesting
      policies and matching strategies (all-matching or first-match),
      priorities between rules, and roles.  One of the roles that must
      be conditionally matched is the models denotation of "read-only"
      or "read-write" policy rules into ordered and prioritized groups
      of policy.  The [I-D.hares-i2rs-bnp-info-model] suggests that non-
      nested policy groups may be sufficient for I2RS status and
      configuration work.

   RIB IM

      RIB Informational Model (RIB IM) [I-D.ietf-i2rs-rib-info-model]

   Routing instance

      Routing Code often has the ability to spin up multiple copies of
      itself into virtual machines.  Each Routing code instance or each
      protocol instance is denoted as N_INSTANCE in the text below.

3.  Filter-Based Routing Information Model Overview

   Filter based routing is a technique used to make packet routing
   decisions based on filter policies set by the network administrator.
   Routing decisions in a Filter-Based RIB (FB-RIB) are based on several
   criteria beyond destination address, such as application, IP protocol



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   used, identity of the end system, and even packet size.  Policy
   actions are typically applied before applying QoS constraints since
   policy actions may override QoS constraint.

   The Filter-Based routing may provide many benefits, including better
   resource allocation, load balancing and QoS.

   The I2RS use cases which benefit from Filter-Based Routing are:
   Protocol independent Use cases and large flow use cases described in
   [I-D.hares-i2rs-usecase-reqs-summary].

   The Filter-based policies are specified in most routers/switches as
   an ordered set of rules.  Each policy rule has a set of match
   conditions, and a set of actions which may include forwarding actions
   and QoS actions.  This draft uses a generic description of filters
   rules described in [I-D.hares-i2rs-bnp-info-model], but other policy
   models could be used if they have the same characteristics.

   (Note: Antecedents of this generic structure for filter/policy rules
   can be found in the IETF PCIM work ([RFC3060], [RFC3460], and
   [RFC3644]).)

3.1.  Scope

   A Filter-Based RIB (FB-RIB) information model can be considered in
   either a top-down view examining the filter policy which controls the
   RIBs or from a bottom-up view which considers the data plane.  A top-
   down view considers how the I2RS client provides filters for what can
   be added to a FB-RIB.  This draft takes a bottom-up approach and
   looks at just the routes being installed in the FB-RIB.  The bottoms-
   up view considers how routes link to forwarding data planes that must
   be supported.  In this view, the match filters must consider IP [both
   IPv4 and IPv6], but may also consider MPLS and encapsulated protocols
   such as TCP [RFC0793], UDP [RFC0768], STCP [RFC4960], ICMP [RFC0792].
   This draft takes the bottoms-up viewpoint which looks at how the FB-
   RIB controls the data plane.

   This provides a generic FB-FIB description in section 4, and provide
   FB-FIB extension to cover the L3 IP filter covering IPv4 [RFC0791]
   and IPV6 [RFC2460]) in section 5.

3.2.  Generic Rules for Filter-Based RIBS

   Generic filter rules are described in
   [I-D.hares-i2rs-bnp-info-model].  The filter rules are included as
   list of groups of rules which in turn contain rules.  This grouping
   hierarchy allows the ordering of all rules, and a logical group of
   filter rules based on a logical group (E.g. customers).



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   Within a particular order (E.g.  Order 2), priority will establish
   the filter sequence within the order.  If two priorities match, it is
   assumed the ordering of the filters do not impact the level

   Each Rule within the Rule list has a rule-action match condition
   which is based on type.  Type can be the "generic filter match-
   actions" or match actions specific to another type of policy (e.g.
   ACL rule match-action).  For the generic filter match-actions has
   match field (bnp-term-match), action field (bnp-action), and a
   forwarding field (bnp-generic forwarding) as figure 1 shows.









































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                     +-----------------+
                     | group of rules  |
                     +-----------------+
                             |
                     +-----------------+
                     | list of rules   |
                     +-----------------+
                             |
                     +-----------------+
                     |      Rule       |
                     +-------|---------+
                             |
                     +-------------------+
                     | Rule Match action |
                     +------|------------+
                       +----|---------------+
                 +-----|---------+  +-------|-----+
                 | Generic Rule  |   | ACL Rule    |
                 | match-action |   | match-action |
                 +-----------|--+   +--------------+
                             |
            +-----------|----|-----------|------------------+
                        |                |                  |
               +--------V------+    +----V--------+ +-------V-----+
               | bnp term-match|    | bnp-action  | | bnp-generic |
               | Condition     |    | action      | | forwarding  |
               |               |    |             | | actions     |
               +--------|------+    +-------|-----+  +-------------+
                        |                   |            (drop, forward)
                        |                   |
       +-------|------|-|-------+       +-|-|-----|------|--------|-+
       |       |      |       |           |       |      |        |
       V       V      V       V           V       V      V        V
    ....... ....... ....... ..........  ........  ..... ...... .........
    :L1   : :L2   : :L3   : : Service:  :  L1  : :L2  : :L3  : :Service:
    :match: :match: :match: : match  :  :action: :act.: :act.: :action :
    ''''''' ''''''' ''''''' ''''''''''  '''''''' '''''  '''''  '''''''''
                           Figure  2


   An example of this hierarchy is shown in figure 2:










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        Group
          Name: internal-nets
          Scope: L3-FB-RIB, R/W
          group-installer: v-netops
          rule-list
        rule-1;
            name: v-netops-lan
                order: 1
                installer: v-netops
                status
                   ro-status: active
                   ro-rule-inactive-reason null
                   ro-iule-installer: v-netops
                priority 1
                rule-match-act
                        case:BNP-GENERIC-MATCH-ACTION
                            Case:L3-Header
                                   term-match  DEST-Header 192.200.1.*/24
                                   term-action:
                                     n-acts: 0
                                   term-forward: drop
                rule-2
          name:ICMP packets
          order: 2
          installer: v-netops
          status:
                        ro-status: inactive
                        ro-rule-inactive-reason: admin-inactive
            ro-installer-active-filter: (null)
          priority 3
          rule-match-act:
             Case:BNP-GENERIC_MATCH-ACTION
                Case:L3-Header
                                        term-match: ICMP-Type
                                        term-action:
                                           n-acts: 0
                    term-forward: drop

                    Figure 3: Example structure

4.  Filter-Based-RIB module

   A Filter-Based RIB (FB-RIB) is an entity that contains an ordered set
   of filters (match/action conditions) and a default RIB of the form
   found in [I-D.ietf-i2rs-rib-info-model].  An ordered set of filters
   implies that the insertion of a filter route into a FB-RIB MUST
   provide the ability to insert a filter route at any specific position
   and delete of a filter-based route at a specific position.  The



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   ability to change a filter route at a specific position combines
   these two functions (delete an existing filter route rule and add a
   new policy rule).

   Each FB-RIB is contained within a routing instance, but one routing
   instance (named by an INSTANCE_NAME) can contain multiple FB-RIBs.
   Each routing instance is associated with a set of interfaces, a
   router-id, a FB default-RIB, and list of FB-RIBs.  Only some of the
   interfaces associated with a routing instance may be associated with
   a FB-RIB.  Each interface can be associated with at most one FB RIB.

   Packets arriving on an interface associated with a FB-RIB will be
   forwarded based on filters in a FB-RIB or the FB-RIB Default RIB (if
   no matches occur).  The processing within the FB-RIB process within
   the routing system is expected to do the following:

   o  When a packet successfully matches match term/entry in a filter-
      route, the corresponding rule-actions are applied.

   o  If a packet does not match the match term/entry in the filter
      route, the filter route processing goes to the next term/entry in
      the order, and looks for a match, within the current filter or
      goes to the next filter in the list.  This continues until either
      a filter route match term/entry is successfully matched, or no
      more filters in the list exists.

   o  If no match has been found within the FB-RIBs on the FB-RIB list,
      then the packet will be forwarded using the Default-RIB specified
      by the FB-RIB if one exists.  If no Default-RIB is specified, the
      packet will be discarded.





















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            +-------------------------------+
            |     routing instance          |
            +--|--------|---------------+---+
               |        |               |
               |        |               |
       +-----------+ +-------------+ +-----------+
       |interface* | |FB_RIB *list | | FB-Default|
       |  list     | |             | |-RIB       |
       +-----------+ +--|----------+ +---|-------+
                        |              RIB (RIB-info IM)
                        ^
                       /|\
            +-----------^-----------+
            |        FB RIB         |
            +-----------|-----------+
                        |
                        |
            +-----------------------+
            | FB FIB Ordered List   |
            |   of filter rules     |
            +-----------|------------+
                        | uses bnp generic filter-policy
            +-----------|------------+
            |    BNP-Rule-Group*    |
            +-----------|-----------+
                                |
            +-----------|--------------+
            |       BNP-Rule*          |
            |(ordered list of rules of |
            | the form match-action)   |
            +--------------------------+

        Figure 4: Routing instance with FB-RIB

4.1.  FB-RIB entries

   The FB-RIB entries associated with each FB-RIB in a routing instance
   are:

   instance-name (FB-FIB-instance-name)

      Name of Routing instance

   router-id (FB-RIB-router-id)

      router id associated with the FB-RIB function of the Routing
      instance




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   Interface_list(FB-RIB-interface)

      A list of interfaces that all of the FB-RIB RIBs operate over.
      This list must be a subset of the interface_list associated with
      the routing instance.

   Default RIB

      A RIB contained in the same routing instance that can be used to
      forward packets when the FIB entries in the FB-RIB list do not
      match the packets.  This Default-RIB forwards based on destination
      based routing.

   FB-RIB Order list of policy (FB-FIB-O-Filters

      ordered list of filter rules of the form in
      [I-D.hares-i2rs-bnp-info-model]

   The Top-level Yang structure for the FB-RIB is:

    module: FB-RIB
      +--FB-RIB-module
         +--rw FB-RIB-instance-name
         +--rw RB-RIB-router-id  uint32
             +--rw FB-RIB-interface*
             |  +--rw FB-RIB-interface interface-ref-id
             +--rw FB-Default-RIB rib-ref
         +--rw FB-RIB
                +--rw FB-RIB-Name
                    +--rw FB-RIB-AFI
                    +--rw FB-RIB-intf*
                    +--rw FB-FIB-status-info
                    |  +--rw fb-rib-update-ref uint64
                    +--rw FB-RIB-Ordered-Filters
                    uses bnp-policy for filters
                         augments /nt:bnp-generic-rules/rule-group/

                     Figure 4: FB RIB Yang Structure

4.2.  FB-RIB Description

   Each FB-RIB has the following:

   o  FB-RIB-Name - Name identifier for FB- RIB

   o  FB-RIB-AFI - AFI Supported by the FB-RIB





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   o  FB-RIB-intf* - Interface FB-FIB operates on.  Note that an
      interface can be associated with at most one FB-RIB.  For example
      interfaces eth1 and eth2 can be associated to FB-RIB, but these
      two interfaces cannot be connected to any other FB-RIB.

   o  FB-RIB-Status-info - status at RIB level which includes number of
      times since reconfiguration this FB-RIB has been updated.

   o  FB-RIB-Ordered-Filters contains list of rule groups

      *  Each rule-group is indexed by group name contains:

         +  group-name (string)

         +  status-info which contains two elements:

            -  group status (installed, active or inactive).

            -  inactive reason (null, policy-conflict, unsupported).

            -  group-installer-identity (string)

         +  group order (unit16)

         +  ordered rule list

4.3.  Rules on Order Rule

   This section provides a short description of the generic filter
   policy rule's condition-action from [I-D.hares-i2rs-bnp-info-model]
   which is used by the FB-RIB.




















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            +-----------------------+
            |     Filter Rule       |
                    |                       |
            +--|-----------------|--+
               :                 :     .......
               :                 :     :     :
      +--------V-------+ +-------V-------+   :
      |Filter Condition| | Filter Action |<...
      +----------------+ +-+----------+--+
                          /|\        /|\
                  "extends"|          | "extends"
                       +---+          +--------+
                       |                       |
               +-------^-------+         +-----^---------+
               |  QoS Action   |         |Forward Action |
               +---------------+         +---------------+
                 :     :    :                 :     :    :
             ....:     :    :.....       .....:     :    :.....
             :         :         :       :          :         :
        +----V---+ +---V----+ +--V---+ +-V------++--V-----++--V-----+
        |Set     | |QoS     | |QoS   | |Forward ||Next Hop||Next Hop|
        |Operator| |Variable| |Value | |Operator||Variable||Value   |
        +--------+ +--------+ +------+ +--------++--+-----++--------+
                                                   /|\
                                                    | "extends"
                                                +---^----+
                                                |Next Hop|
                                                |Type    |
                                                +--------+
                    Figure 5: Filter Actions for FB-RIB

   The policy/filter rule contains the following:

   o  rule-ref - ordered id number for the policy rule

   o  rule-status-info - status on the policy rule that contains the
      following:

      *  rule-status - installed, active, or inactive.

      *  rule-inactive-reason - can be null, policy-conflict, i2rs-rule-
         supersedes,unsupported)

      *  rule-installer - the entity that installed rule.

   o  match-filter - ordered match field for FB-RIB route entry which
      contains:




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      *  order- order number in match sequence

      *  match-term - contains matches for filters for different packets
         based on L1, L2, L3, transport, or service level.

      *  rule-action* - An ordered list of policy actions that includes
         the following:

         +  n-acts - number of actions

         +  Actions: set values in one or more of the following:

         +  forwarding-actions - which includes

            -  std-forwarding - (enumeration) forwarding packet

               o  Drop_Packet - drop packet

               o  Drop_Packet_ICMP - dropping packet with ICMP
                  unreachable sent

               o  Forward_Packet_specific - send to specific next hop

               o  Forward_Packet_default - forward based on FB-RIB
                  Default RIB

4.4.  I2RS FB-RIB interaction with configured filter rules

   The I2RS client-agent pair process within a routing process to add
   ephemeral these changes to the filter State so that

   FB-RIB-rules(running) = FB-RIB-config + FB-Rules-I2RS-ephemeral

   The I2RS ephemeral state will not survive a reboot of the machine.
   Upon a reboot, the I2RS client must reload the I2RS Agent with the
   I2RS FB-RIB state lost in the reboot.

   Writing I2RS FB-rules to permanent configuration may be desirable.
   This has not been considered in this verison of this draft.

4.5.  Relationship between RB-RIB Rule Model and RIB Information Model

   The RIB in a router with I2RS is the following:

   running RIB = configured-RIB + routes-installed-from-protocols +
   I2RS-ephemeral-state





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   As described in [I-D.ietf-i2rs-rib-info-model], the I2RS ephemeral
   RIB information in routing instance contains a collection of RIBs,
   interfaces, and routing parameters including the following:

   o  The set of interfaces indicates which interfaces are associated
      with this routing instance.

   o  The RIBs specify how incoming traffic is to be forwarded based on
      destination (E.g.  RIB and FB-RIB).

   o  The routing parameters control the information in the RIBs.

   FB-RIB and RIB can not be used at the same time, which means:

   o  If a router doesn't support filter-based routing, a router MUST
      use RIB and MUST not use FB-RIB.

   o  If a router supports filter-based routing:

      *  FB-RIB is used

      *  Multiple FB-RIBs may exist within a routing instance

      *  An interface can be associated with at most one FB-RIB

      *  The Default RIB for a FB-RIB is used if several criteria beyond
         destination address is not matched.

5.  L3 Match-Action Rules

   Layer 3 match might contain the following:

   o  IPv4 header match with one or these fields: IPv4 source address,
      IPv4 destination address, IPv4 Protocol, IPv4 TOS/DSCP field, IPv4
      ICMP field, and the length of the packet.  These matches can be
      exact matches, longest prefix matches for addresses, or range
      matches for values in TOS/DSCP field, ICMP field or length of
      packet.

   o  IPv6 header match with one or more match of IPv6 source address,
      IPv6 destination address, IPvs Traffic class (DSCP), IPv6 Flow
      label, IPv6 payload length, IPv6 next-header, hop-limit.  These
      matches can be exact matches, longest prefix matches for
      addresses, or range matches.

   Layer 3 Actions might set values in:





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   o  In IPv4 packets set values in any of the following fields: IPv4
      source address, IPv4 destination address, IPv4 Protocol, IPv4 TOS/
      DSCP field, IPv4 ICMP field or the length of the packet.  (Please
      note that hardware data plane forwarders may only be able to set
      TOS/DSCP while software data plane forwarders may be able set
      additional fields.)

   o  In IPv6 packets set values in any of the following fields: IPv6
      source address, IPv6 destination address, IPv6 Protocol value,
      IPv6 Flow, or IPv6 packet length.

   Layer 3 Forwarding can augment the basic to forward via tunnels.

6.  Open issues

   This section record the issues with the initials of the person who
   recorded it.

   Forwarding per interface (JMH)

      - The authors believe the forwarding per interface is covered by
      the attachment of a FB-RIB to interface-list.

   Centralized or Distributed filter policy Strategy (JMH)

      The authors believe this structure can be used by either
      centralized or distributed forwarding for configuration or the
      I2RS ephemeral data structure

   policy database-enforcement points architecture (JMH)

      The authors believe this yang modules describes the filters which
      provides a specific enforcement of forwarding policy.  The wider
      constraints of how filter policy is stored as filter rules or
      groups of filters rules can be done as the generic network policy
      as described in [I-D.hares-i2rs-bnp-info-model] or other policy.
      Other forms of policy rule filter sets can be used.

   policy rule conflicts (JMH)

      Detection of filter rule conflicts are done by the agent module
      receiving the filters from configuration or ephemeral I2RS stream.
      The filter can be reject or installed and rejected from active use
      due to conflicts at either a group level or the filter rule level.
      At the policy group level the group-policy-status-info contains a
      status of installed, active, or installed-inactive.  If the status
      is inactive the group-policy-inactive-reason can indicate policy-
      conflicts.  The policy-rule has a similar status (policy-rule-



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      status-info with policy-rule-status and policy-rule-inactive-
      reason).

7.  IANA Considerations

   This draft includes no request to IANA.

8.  Security Considerations

   TBD.

9.  References

9.1.  Normative References:

   [I-D.hares-i2rs-bnp-info-model]
              Hares, S. and Q. Wu, "An Information Model for Basic
              Network Policy", draft-hares-i2rs-bnp-info-model-01 (work
              in progress), October 2014.

   [I-D.ietf-i2rs-architecture]
              Atlas, A., Halpern, J., Hares, S., Ward, D., and T.
              Nadeau, "An Architecture for the Interface to the Routing
              System", draft-ietf-i2rs-architecture-09 (work in
              progress), March 2015.

   [I-D.ietf-i2rs-rib-info-model]
              Bahadur, N., Folkes, R., Kini, S., and J. Medved, "Routing
              Information Base Info Model", draft-ietf-i2rs-rib-info-
              model-05 (work in progress), January 2015.

   [I-D.ietf-netmod-acl-model]
              Bogdanovic, D., Sreenivasa, K., Huang, L., and D. Blair,
              "Network Access Control List (ACL) YANG Data Model",
              draft-ietf-netmod-acl-model-02 (work in progress), March
              2015.

9.2.  Informative References

   [I-D.hares-i2rs-usecase-reqs-summary]
              Hares, S. and M. Chen, "Summary of I2RS Use Case
              Requirements", draft-hares-i2rs-usecase-reqs-summary-01
              (work in progress), October 2014.








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   [I-D.shaikh-rtgwg-policy-model]
              Shaikh, A., Shakir, R., D'Souza, K., and C. Chase,
              "Routing Policy Configuration Model for Service Provider
              Networks", draft-shaikh-rtgwg-policy-model-00 (work in
              progress), January 2015.

   [I-D.yan-rtgwg-routing-policy-yang]
              Yan, G. and S. Zhuang, "Yang Data Model for Routing
              Policy", draft-yan-rtgwg-routing-policy-yang-00 (work in
              progress), December 2014.

   [I-D.zhdankin-idr-bgp-cfg]
              Alex, A., Patel, K., Clemm, A., Hares, S., Jethanandani,
              M., and X. Liu, "Yang Data Model for BGP Protocol", draft-
              zhdankin-idr-bgp-cfg-00 (work in progress), January 2015.

   [RFC0768]  Postel, J., "User Datagram Protocol", STD 6, RFC 768,
              August 1980.

   [RFC0791]  Postel, J., "Internet Protocol", STD 5, RFC 791, September
              1981.

   [RFC0792]  Postel, J., "Internet Control Message Protocol", STD 5,
              RFC 792, September 1981.

   [RFC0793]  Postel, J., "Transmission Control Protocol", STD 7, RFC
              793, September 1981.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC2460]  Deering, S. and R. Hinden, "Internet Protocol, Version 6
              (IPv6) Specification", RFC 2460, December 1998.

   [RFC3060]  Moore, B., Ellesson, E., Strassner, J., and A. Westerinen,
              "Policy Core Information Model -- Version 1
              Specification", RFC 3060, February 2001.

   [RFC3460]  Moore, B., "Policy Core Information Model (PCIM)
              Extensions", RFC 3460, January 2003.

   [RFC3644]  Snir, Y., Ramberg, Y., Strassner, J., Cohen, R., and B.
              Moore, "Policy Quality of Service (QoS) Information
              Model", RFC 3644, November 2003.

   [RFC4960]  Stewart, R., "Stream Control Transmission Protocol", RFC
              4960, September 2007.




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   [RFC5575]  Marques, P., Sheth, N., Raszuk, R., Greene, B., Mauch, J.,
              and D. McPherson, "Dissemination of Flow Specification
              Rules", RFC 5575, August 2009.

Authors' Addresses

   Sriganesh Kini
   Ericsson

   Email: sriganesh.kini@ericsson.com


   Susan Hares
   Huawei
   7453 Hickory Hill
   Saline, MI  48176
   USA

   Email: shares@ndzh.com


   Anoop Ghanwani
   Dell

   Email: anoop@alumni.duke.edu


   Ram Krishnan
   Brocade

   Email: ramk@Brocade.com


   Qin Wu
   Huawei
   101 Software Avenue, Yuhua District
   Nanjing, Jiangsu  210012
   China

   Email: bill.wu@huawei.com


   Dean Bogdanovic
   Juniper Networks
   Westford, MA

   Email: deanb@juniper.net




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   Jeff Tantsura
   Ericsson

   Email: Jeff Tantsura jeff.tantsura@ericsson.com


   Russ White
   Ericsson

   Email: russw@riw.us









































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