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Versions: 00 01 02 03 draft-ietf-i2rs-fb-rib-data-model

I2RS working group                                              S. Hares
Internet-Draft                                                    Huawei
Intended status: Standards Track                                 S. Kini
Expires: September 22, 2016                                     Ericsson
                                                               L. Dunbar
                                                                  Huawei
                                                             R. Krishnan
                                                                    Dell
                                                           D. Bogdanovic
                                                        Juniper Networks
                                                                R. White
                                                                Linkedin
                                                          March 21, 2016


                      Filter-Based RIB Data Model
                 draft-hares-i2rs-fb-rib-data-model-03

Abstract

   This document defines a data model to support the Filter-based
   Routing Information Base (RIB) Yang data models for I2RS.  A routing
   system uses the Filter-based RIB to program FIB entries that process
   incoming packets by matching on multiple fields within the packet and
   then performing a specified action on it.  The FB-RIB can also
   specify an action to forward the packet according to the FIB entries
   programmed using the RIBs of its routing instance.

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
   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 22, 2016.







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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  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Definition of I2RS Filter Based RIB . . . . . . . . . . .   3
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   4
   3.  Definitions and Acronyms  . . . . . . . . . . . . . . . . . .   4
   4.  High level Yang structure for the FB-RIB  . . . . . . . . . .   5
     4.1.  Top Level Yang Structure for ietf-fb-rib  . . . . . . . .   7
     4.2.  Filter-Based RIB structures . . . . . . . . . . . . . . .   8
   5.  yang models . . . . . . . . . . . . . . . . . . . . . . . . .   9
     5.1.  Filter-Based RIB types  . . . . . . . . . . . . . . . . .   9
     5.2.  FB-RIB  . . . . . . . . . . . . . . . . . . . . . . . . .  15
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  18
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  18
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  18
     8.1.  Normative References: . . . . . . . . . . . . . . . . . .  18
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  19
   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.

   This document provides a yang module for the I2RS filter Based
   Routing Information Base (FB-RIB) and describes the I2RS interaction
   with routing filters within a routing element.  The informational
   model for the FB-RIB is in [I-D.kini-i2rs-fb-rib-info-model]





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1.1.  Definition of I2RS Filter Based RIB

   Filter-based routing is a technique used to make packet forwarding
   decisions based on a filter that is matched to the incoming packets
   and the specified action.  It should be noted that that this is
   distinct from the static routes in the RIB
   [I-D.ietf-i2rs-rib-info-model] where the routing is destination
   ddress based.

   A Filter-Based RIB (Routing Information Base) is contained in a
   routing instance (defined in [I-D.ietf-i2rs-rib-info-model]).  It
   contains a list of filters (match-action conditions) and a list of
   interfaces the filter-based forwarding operates on, and default
   RIB(s).

   A Filter Based RIB uses packet forwarding policy.  If packet
   reception is considered an event, then the I2RS Filter-based RIB uses
   a minimalistic Event-matchCondition-Action policy with the following
   characteristics:

      event = packet/frame received,

      match condition - match on field in frame/packet or circumstances
      relating to packet reception (e.g. time received),

      action - modify packet and forward/drop packet.

   A Filter-based RIB entry specifies match filters for the fields in a
   packet (which may include layer 1 to layer 3 header fields, transport
   or application fields) or size of the packet or interface received
   on.  The matches are contained in an ordered list of filters which
   contain pairs of match condition-action (aka event-condition-action).

   If all matches fail, default action is to forward the packet using
   Destination Based forward from the default RIB(s).  The default RIBs
   can be:

   o  created by the I2RS Routing Informational Base (RIB) manager using
      the yang model described in: in [I-D.ietf-i2rs-rib-info-model], or

   o  configured RIB created using static routes or
      [I-D.ietf-netmod-routing-cfg].

   o  or static RIB created via static route yang model

   Actions in the condition-action pair may impact forwarding or set
   something in the packet that will impact forwarding.  Policy actions




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   are typically applied before applying QoS constraints since policy
   actions may override QoS constraint.

   The Filter-Based RIB resides in ephemeral state as does the I2RS RIB
   and I2RS topology models.

2.  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].

   In this document, these words will appear with that interpretation
   only when in ALL CAPS.  Lower case uses of these words are not to be
   interpreted as carrying RFC-2119 significance.

3.  Definitions and Acronyms

   CLI

      Command Line Interface

   FB-RIB

      Filter-Based Routing Information Base

   FB-Route

      The policy rules in the filter-based RIB are prescriptive of the
      Event-Condition-Action form which is often represented by if
      Condition then action".

   Policy Group

      Policy Groups are groups of policy rules.  The groups of policy in
      the basic network policy [I-D.hares-i2rs-pkt-eca-data-model] allow
      grouping of policy by name.  This structure allow easier
      management of customer-based or provider based filters, but does
      not change the policy-rules list.

   RIB IM

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

   Routing instance

      A routing instance, in the context of the FB-FIB is a collection
      of RIBs, interfaces, and routing parameters.  A routing instance



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      creates a logical slice of the router and allows different logical
      slices; across a set of routers; to communicate with each other.

4.  High level Yang structure for the FB-RIB

   There are three levels in the Filter-Based RIB (FB-RIB) structure:

   o  a global FB-RIB structures,

   o  the common structure of the FB-RIB, and

   o  the groupings that make up the FB-RIB

   All structures have two types: configuration/ephemeral state and
   operational state.

   This yang model describes three types of FB-RIBS: configuration,
   I2RS, and BGP Flow Specification.  The configuration FB-RIB yang
   module is config state ("config true" and "ephemeral false") and
   survives a reboot.  The I2RS FB-RB yang model is reboot ephemeral
   ("config true" and "ephemeral true;").  The BGP Flow Specification
   Filter-Based RIB stores policy which is received by the BGP peers.
   The BGP configuration contains a flow-specification as part of its
   configuration, and the ability to export this flow specification to
   other BGP peers.  The BGP local configuration with the flow
   specification is consider ("config true"), and it is possible to be
   ephemeral ("ephemeral true") or local configuration ("ephemeral
   false" ).  The BGP flow specifications received from peers are
   derived state, just like other BGP dervised state.






















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   Configuration RIBS

      +-----------------------------------------+
      |     routing instance                    |
      +-------|-------------|----------------|--+
              |             |                |
              |             |                |
    +---------|----+  +-----|-----+ +--------|-----+
    |config-fb-rib |  |i2rs-fb-rib| |bgp-fs-fb-rib |
    |              |  |           | |config only   |
    +------|-------+  +-----|-----+ +------|-------+
           |............:....|...............|
                        :  (uses common structures
                        :   in separate lists of FB-RIBs)
               +--------|----+
               |fb-ribs*     |
               |             |
               +--|----------+
                  |


     Figure 3: Routing instance with three types of
               Filter-FIB lists

   The following section provides the high level yang structure diagrams
   for the following levels of structures for both config/ephemeral
   state and operationa.

   o  ietf-fb-rib - contains filter-based RIBS for config, I2RS FB-RIB,
      and BGP Flow Specification.

   o  fb-rib - that contains the structures for the filter-based
      grouping

   o  fb-rib-types - that contains the structures for groupings within
      the filter-based RIBS

   These structures are contained within the yang section in this draft.

   The packet-reception ECA policy yang module is contained in the draft
   [I-D.hares-i2rs-pkt-eca-data-model].

   For those who desire more information regarding the logic behind the
   I2RS Filter-Based RIB, please see the Informational Model at:
   [I-D.kini-i2rs-fb-rib-info-model].






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4.1.  Top Level Yang Structure for ietf-fb-rib

   The Top-level Yang structure for a global FB-RIB types (similar to
   acl) is not defined for filter-based RIBS.  The I2RS Filter-Based RIB
   should be defined under this structure under a routing instance.  The
   three things under this RIB would be: configured Filter-Based RIB
   (aka Policy routing), I2RS reboot Ephemeral Filter-Based RIB, and BGP
   Flow Specification's Filter-Based RIB.  All of these RIBs have
   similar actions.

   There are two types top-level structures for ietf-fb-ribs: config and
   operational state.

   The Top-level Yang structure for a global configuration of Filter-
   Based RIBs are:

   Augments rt:logical-network-elements:\
           :logical-network-element:network-instances: \
               network-instance


   ietf-fb-rib module
     +--rw ietf-fb-rib
        +--rw default-instance-name string
        +--rw default-router-id rt:router-id
        +--rw config-fb-ribs
               if-feature "config-filter-based-RIB";
           uses fb-ribs;
        +--rw i2rs-fb-ribs
                     if-feature "I2RS-filter-based-RIB";
                     uses fb-rib-t:fb-ribs;
        +--rw bgp-fs-fb-ribs
                    if-feature "BGP-FS-filter-based-RIB";
                     uses fb-rib-t:fb-ribs;

       Figure 5: configuration state

   The Top-level Yang structure for a global operational state of
   Filter-Based RIBs are:












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   Augments rt:logical-network-elements:\
           :logical-network-element:network-instances: \
               network-instance

   ietf-fb-rib module
     +--rw ietf-fb-rib-opstate
       +--rw default-instance-name string
       +--rw default-router-id rt:router-id
           +--rw config-fb-rib-opstate
                     if-feature "config-filter-based-RIB";
                     uses fb-rib-t:fb-ribs-oper-status;
           +--rw i2rs-fb-rib-opstate {
                     if-feature "I2RS-filter-based-RIB";
                     uses fb-rib-t:fb-ribs-oper-status;
           +--rw bgp-fs-fb-rib-opstate
                     if-feature "BGP-FS-filter-based-RIB";
                     uses fb-rib-t:fb-ribs-oper-status;

       Figure 5: operational state

4.2.  Filter-Based RIB structures

   The Top-level yang structures at the Filter-Based RIB level have two
   types: configuration and operational state.

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

























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    module: fb-rib-types:
    +--rw fb-ribs
       +--rw fb-rib* [rib-name]
       |  +--rw rib-name string
       |  |  rw fb-type identityref / ephemeral or not
       |  +--rw rib-afi rt:address-family
       |  +--rw fb-rib-intf* [name]
       |  |  +--rw name string
       |  |  +--rw intf if:interface
       |  +--rw default-rib
       |  |  +--rw rt-rib rt:routing:routing-instance:name
       |  |  +--rw config-rib string;  // config rib name
       |  |  +--rw i2rs-rib:routing-instance:name
       |  |  +--rw i2rs-rib string;   //ephemeral rib name
       |  |  +--rw bgp-instance-name string
       |  |  +--rw bgp-rib  string    //session ephemeral
       |  +--rw fb-rib-refs
       |  |  +--rw fb-rib-update-ref uint32 /count of writes
       |  +--rw instance-using*
       |  |   device:networking-instance:networking-instance-name
       |  +--use pkt-eca:pkt-eca-policy-set

             Figure 6: FB RIB Type Structure

   HIgh Level Yang

   +--rw fb-ribs-oper-status
      +--rw fb-rib-oper-status* [fb-rib-name]
            uses pkt-eca:pkt-eca-opstate

5.  yang models

5.1.  Filter-Based RIB types

 <CODE BEGINS> file "ietf-fb-rib-types@2016-02-09.yang"
  module ietf-fb-rib-types {

   yang-version "1";

   // namespace
     namespace "urn:ietf:params:xml:ns:yang:ietf-fb-rib-types";
     prefix "fb-rib-t";
         import ietf-interfaces {prefix "if";}
         import ietf-routing {prefix "rt";}
         import ietf-pkt-eca-policy {prefix "pkt-eca";}

   // meta
   organization



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     "IETF";

   contact
      "email: shares@ndzh.com;
           email: sriganesh.kini@ericsson.com
       email: cengiz@packetdesign.com
       email: ivandean@gmal.org
       email: linda.dunbar@huawei.com;
       email: russ@riw.com;
          ";

   description
     "This module describes a YANG model for the I2RS
     Filter-based RIB Types.  These types
     specify types for the Filter-Based RIB.

         Copyright (c) 2015 IETF Trust and the persons identified as
     the document authors.  All rights reserved.

     Redistribution and use in source and binary forms, with or
     without modification, is permitted pursuant to, and subject
     to the license terms contained in, the Simplified BSD
     License set forth in Section 4.c of the IETF Trust's Legal
     Provisions Relating to IETF Documents
     (http://trustee.ietf.org/license-info).";


   revision "2016-02-09" {
       description
         "Filter-Based RIB protocol ";
         reference "draft-hares-i2rs-fb-rib-data-model-01";
     }

     typedef fb-rib-type-def {
            type identityref {
              base "fb-rib-type";
                  }
                 description
                 "This type is used to refer to
                  source of Filter-Based RIB:
                  configuration, I2RS, Flow-Spec.";
      }

         identity fb-rib-type {
                 description
                 "This type is used to refer to
                  source of Filter-Based RIB:
                  configuration, I2RS, Flow-Spec.";



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         }

         identity fb-rib-config-type {
                  base fb-rib-type;
              description
              "config Filter-Based RIB";
          }

         identity fb-rib-i2rs-ephemeral-type {
                  base fb-rib-type;
              description
              "I2RS Reboot ephemeral Filter-Based RIB";
          }

         identity fb-rib-BGP-FS-type {
                  base fb-rib-type;
              description
              "BGP Flow Specification Filter-Based RIB";
          }

     typedef fb-rib-policy-type-def {
            type identityref {
              base "fb-rib-policy-type";
                  }
                 description
                 "This type is used to refer to FB-RIB type";
      }

         identity fb-rib-policy-type {
              description
              "Types of filter-based policies
                   acl and eca";
          }

            identity fb-rib-acl {
                   base fb-rib-policy-type;
               description
           "filter based policy based on access-lists";
             }

            identity fb-bnp-eca-rules {
                   base fb-rib-policy-type;
               description
           "filter based policy based on qos forwarding rules";
             }

         typedef fb-rules-status  {
            type identityref {



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              base "fb-rule-opstat";
                  }
                 description
                 "This type is used to refer to FB-RIB type";
          }

           identity fb-rule-opstat {
                 description
                 "operational statues for filter rules
                  inactive and active";
                  }

           identity fb-rule-inactive {
                 base fb-rule-opstat;
                 description
                 "policy rule is inactive";
            }

           identity fb-rule-active {
                 base fb-rule-opstat;
                 description
                 "policy rule is active";
            }

           grouping fb-rib-rule-order-status {
           leaf statement-order {
                   type uint16;
                   description "order identifier";
            }
            leaf statement-oper_status {
                    type fb-rules-status;
                    description "status of rule";
                 }
                 description "filter-rib
                   policy rule order and status";
           }

      grouping fb-rib-group-order-status {
           leaf group-refcnt {
             type uint16;
             description "refcnt for this group";
                 }
            leaf group-installed {
             type uint32;
             description "number of rules installed";
                 }
                 leaf group-matches {
                  type uint64;



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                  description "number of matches by all
                   rules in group";
                 }
                 description "fb-rib group list order
                    and status info.";
           }

         grouping fb-rib-updates {
            leaf fb-rib-update-ref {
                  type uint64;
              description
                  "number of updates to this FB RIB
                   since last reboot";
            }
            description "FB-RIB update info";
          }

         grouping default-fb-rib {
            // configuration instance for default RIB
         leaf config-instance {
                 type rt:routing-instance-ref;
                 description "instance name";
                 }
                 leaf config-rib {
                   type string;
                   description "name of config default RIB";
                 }
                 //I2RS default instance for default RIB
             leaf i2rs-instance-name {
                  type string;
                  description "I2RS instance name";
                 }
                 leaf i2rs-rib-name {
                         type string;
                 description "name of default I2RS RIB";
                 }
                 leaf bgp-instance-name {
                    type string;
                    description "name of bgp instance";
                 }

                 leaf bgp-fs-rib-name {
                     type string;
                         description "name of BGP
                          flow specification default RIB";
                 }
             description "default RIB for forwarding
                    if the policy match";



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     }

     grouping fb-ribs {
             list fb-rib {
                     key fb-rib-name;
                     leaf fb-rib-name {
                         type string;
                                 mandatory true;
                         description "RIB name";
             }
                     uses rt:address-family;
                     leaf fb-type {
                             type fb-rib-type-def;
                             description "type of RIB
                                 list: config, I2RS rebooot
                                 ephemeral, BGP Flow Specification
                                 ephemeral. ";
                     }
                 list fb-rib-intf {
                           key "name";
                           leaf name {
                                 type if:interface-ref;
                             description
                              "A reference to the name of a
                                  configured network layer
                              interface.";
                            }
                           description "This represents
                             the list of interfaces
                             associated with this routing instance.
                             The interface list helps constrain the
                             boundaries of packet forwarding.
                             Packets coming on these interfaces are
                             directly associated with the given routing
                             instance. The interface list contains a
                             list of identifiers, with each identifier
                             uniquely identifying an interface.";
                 }
                         uses default-fb-rib;  // defaults ribs
                         uses fb-rib-updates;  // write refs to this RIB
                 list instance-using {
                           key instance-name;
                           leaf instance-name {
                             type string;
                             description
                                 " name of instance using this fb-rib
                                  rt:routing-instance";
                            }



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                           description "instances using
                            this fb-rib";
                         }
                     // ordered rule list + group list
                     uses pkt-eca:pkt-eca-policy-set;

                   description  "Configuration of
                      an filter-based rib list";
             }
            description "fb-rib group";
     }

         grouping fb-ribs-oper-status {
             list fb-rib-oper-status {
               key fb-rib-name;
                   leaf fb-rib-name {
                           type string;
                           description "rib name";
                   }
           uses pkt-eca:pkt-eca-opstate;
                   description  "Configuration of
                      an filter-based rib list";
             }
            description "list of FB-FIB operational
              status";
     }


  }

 <CODE ENDS>

5.2.  FB-RIB

 <CODE BEGINS> file "ietf-fb-rib@2016-02-09.yang"
module ietf-fb-rib {
  yang-version "1";

  // namespace
  namespace "urn:ietf:params:xml:ns:yang:ietf-fb-rib";
  // replace with iana namespace when assigned
    prefix "fb-rib";


  // import some basic inet types
  import ietf-yang-types {prefix "yang";}
  import ietf-fb-rib-types { prefix "fb-rib-t";}




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  // meta
  organization
    "IETF";

  contact
     "email: sriganesh.kini@ericsson.com
          email: cengiz@packetdesign.com
      email: anoop@ieee.duke.edu
      email: ivandean@gmail.org
      email: shares@ndzh.com;
      email: linda.dunbar@huawei.com;
      email: russ@riw.com;
         ";

  description
    "This Top level module describes a YANG model for the I2RS
        Filter-based RIB which is an global protocol independent FB RIB module.";

     revision "2016-02-09" {
       description "initial revision";
       reference "draft-hares-i2rs-fb-rib-data-model-01";
     }

        feature config-filter-based-RIB {
    description
      "This feature means that a node support
       config filter-based rib.";
    }
        feature I2RS-filter-based-RIB {
    description
      "This feature means that a node support
       I2RS filter-based rib.";
    }
        feature BGP-FS-filter-based-RIB {
    description
      "This feature means that a node support
      BGP FS filter-based rib.";
    }


         container ietf-fb-rib {
           presence "top-level structure for
            configuration";
       leaf default-instance-name {
             type string;
                 mandatory true;
        description
          "A routing instance is identified by its name,



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           INSTANCE_name.  This MUST be unique across all routing
           instances in a given network device.";
         }
             leaf default-router-id {
                    type yang:dotted-quad;
                    description "Default router id";
                }
                container config-fb-rib {
                 if-feature config-filter-based-RIB;
                  uses fb-rib-t:fb-ribs;
                 description "config filter-based RIB";
                }

                container i2rs-fb-rib {
                  if-feature I2RS-filter-based-RIB;
                  uses fb-rib-t:fb-ribs;
                 description "bgp-fs filter-based RIB";
                }
                container bgp-fs-fb-rib {
                  if-feature BGP-FS-filter-based-RIB;
                  uses fb-rib-t:fb-ribs;
                 description "bgp fs filter-based RIB";
                }
           description "fb-rib augments routing instance";
         }

        container ietf-fb-rib-opstate {
           presence "top-level structure for
            op-state";
           config "false";
       leaf default-instance-name {
             type string;
                 mandatory true;
        description
          "A routing instance is identified by its name,
           INSTANCE_name.  This MUST be unique across all routing
           instances in a given network device.";
         }
             leaf default-router-id {
                    type yang:dotted-quad;
                    description "Default router id";
                }
                container config-fb-rib-opstate {
                  if-feature config-filter-based-RIB;
                  uses fb-rib-t:fb-ribs-oper-status;
                 description "config filter-based RIB";
                }
                container i2rs-fb-rib-opstate {



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                  if-feature I2RS-filter-based-RIB;
                  uses fb-rib-t:fb-ribs-oper-status;
                 description "bgp-fs filter-based RIB";
                }
                container bgp-fs-fb-rib-opstate {
                  if-feature BGP-FS-filter-based-RIB;
                  uses fb-rib-t:fb-ribs-oper-status;
                 description "bgp fs filter-based RIB";
                }
           description "fb-rib augments routing instance";
         }
}



<CODE ENDS>


6.  IANA Considerations

   TBD

7.  Security Considerations

   A I2RS RIB is ephemeral data store that will dyanamically change
   traffic paths set by the routing configuration.  An I2RS FB-RIB
   provides dynamic Event-Condition-Action policy that will further
   change the operation of forwarding by allow dyanmic policy and
   ephemeral RIBs to alter the traffic paths set by routing
   configuration.  Care must be taken in deployments to use the
   appropriate security and operational control to make use of the tools
   the I2RS RIB and I2RS FB-RIB provide.

8.  References

8.1.  Normative References:

   [I-D.hares-i2rs-pkt-eca-data-model]
              Hares, S., Wu, Q., and R. White, "Filter-Based Packet
              Forwarding ECA Policy", draft-hares-i2rs-pkt-eca-data-
              model-02 (work in progress), February 2016.

   [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-13 (work in
              progress), February 2016.




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   [I-D.ietf-i2rs-rib-data-model]
              Wang, L., Ananthakrishnan, H., Chen, M.,
              amit.dass@ericsson.com, a., Kini, S., and N. Bahadur, "A
              YANG Data Model for Routing Information Base (RIB)",
              draft-ietf-i2rs-rib-data-model-05 (work in progress),
              March 2016.

   [I-D.ietf-i2rs-rib-info-model]
              Bahadur, N., Kini, S., and J. Medved, "Routing Information
              Base Info Model", draft-ietf-i2rs-rib-info-model-08 (work
              in progress), October 2015.

   [I-D.ietf-netmod-acl-model]
              Bogdanovic, D., Koushik, K., Huang, L., and D. Blair,
              "Network Access Control List (ACL) YANG Data Model",
              draft-ietf-netmod-acl-model-07 (work in progress), March
              2016.

   [I-D.ietf-netmod-routing-cfg]
              Lhotka, L. and A. Lindem, "A YANG Data Model for Routing
              Management", draft-ietf-netmod-routing-cfg-21 (work in
              progress), March 2016.

   [I-D.kini-i2rs-fb-rib-info-model]
              Kini, S., Hares, S., Dunbar, L., Ghanwani, A., Krishnan,
              R., Bogdanovic, D., and R. White, "Filter-Based RIB
              Information Model", draft-kini-i2rs-fb-rib-info-model-03
              (work in progress), February 2016.

8.2.  Informative References

   [I-D.acee-rtgwg-yang-rib-extend]
              Lindem, A. and Y. Qu, "YANG Data Model for RIB
              Extensions", draft-acee-rtgwg-yang-rib-extend-00 (work in
              progress), October 2015.

   [I-D.ietf-i2rs-usecase-reqs-summary]
              Hares, S. and M. Chen, "Summary of I2RS Use Case
              Requirements", draft-ietf-i2rs-usecase-reqs-summary-02
              (work in progress), March 2016.

   [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>.






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Authors' Addresses

   Susan Hares
   Huawei
   7453 Hickory Hill
   Saline, MI  48176
   USA

   Email: shares@ndzh.com


   Sriganesh Kini
   Ericsson

   Email: sriganesh.kini@ericsson.com


   Linda Dunbar
   Huawei
   USA

   Email: linda.dunbar@huawei.com


   Ram Krishnan
   Dell

   Email: Ramkri123@gmail.com


   Dean Bogdanovic
   Juniper Networks
   Westford, MA

   Email: ivandean@gmail.org


   Russ White
   Linkedin

   Email: russ@riw.us










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