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MSDP YANG module
draft-zhang-pim-msdp-yang-01

The information below is for an old version of the document.
Document Type This is an older version of an Internet-Draft whose latest revision is Replaced
Authors Xufeng Liu , Zheng Zhang , Anish Peter , Mahesh Sivakumar , Feng Guo , Pete McAllister
Last updated 2016-07-07
Replaced by draft-ietf-pim-msdp-yang, RFC 8916
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draft-zhang-pim-msdp-yang-01
PIM WG                                                            X. Liu
Internet-Draft                                                  Ericsson
Intended status: Standards Track                                Z. Zhang
Expires: January 8, 2017                                 ZTE Corporation
                                                                A. Peter
                                                        Juniper Networks
                                                            M. Sivakumar
                                                           Cisco Systems
                                                                  F. Guo
                                                     Huawei Technologies
                                                           P. McAllister
                                                     Metaswitch Networks
                                                            July 7, 2016

                            MSDP YANG module
                      draft-zhang-pim-msdp-yang-01

Abstract

   This document defines a YANG data model for MSDP protocol
   configuration and operation.

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 January 8, 2017.

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

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   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
   2.  Design of the Data Model  . . . . . . . . . . . . . . . . . .   2
   3.  MSDP configuration  . . . . . . . . . . . . . . . . . . . . .   5
   4.  Notifications . . . . . . . . . . . . . . . . . . . . . . . .   5
   5.  MSDP YANG module  . . . . . . . . . . . . . . . . . . . . . .   5
   6.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  20
   7.  Normative References  . . . . . . . . . . . . . . . . . . . .  20
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  21

1.  Introduction

   [RFC3618] introduces protocol definition of MSDP.  This document
   defines a YANG data model for MSDP.  The content is in keeping with
   [RFC3618].

2.  Design of the Data Model

   The msdp peer and source-active content is important part of MSDP.
   The augment should be added below routing-protocol.

module: ietf-msdp
augment /rt:routing/rt:control-plane-protocols:
   +--rw msdp!
      +--rw global
      |  +--rw connect-source?   if:interface-ref
      |  +--rw default-peer! {global-default-peer}?
      |  |  +--rw peer-addr        -> ../../../peers/peer/address
      |  |  +--rw prefix-policy?   string {global-default-peer-policy}?
      |  +--rw originating-rp
      |  |  +--rw interface?   if:interface-ref
      |  +--rw sa-filter
      |  |  +--rw in?    string
      |  |  +--rw out?   string
      |  +--rw ttl-threshold?    uint8
      +--rw peers
         +--rw peer* [address]
            +--rw address           inet:ipv4-address
            +--rw authentication
            |  +--rw (authentication-type)?

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            |     +--:(key-chain) {peer-key-chain}?
            |     |  +--rw key-chain?   key-chain:key-chain-ref
            |     +--:(password) {peer-key-chain}?
            |        +--rw key?         string
            +--rw enable?           boolean {peer-admin-enable}?
            +--rw connect-source?   if:interface-ref
            +--rw description?      string {peer-description}?
            +--rw mesh-group?       string
            +--rw peer-as?          string {peer-as}?
            +--rw sa-filter
            |  +--rw in?    string
            |  +--rw out?   string
            +--rw timer
            |  +--rw connect-retry-interval?   uint16 {peer-timer-connect-retry}?
            |  +--rw holdtime-interval?        uint16 {peer-timer-holdtime}?
            |  +--rw keepalive-interval?       uint16 {peer-timer-keepalive}?
            +--rw ttl-threshold?    uint8
augment /rt:routing-state/rt:control-plane-protocols:
   +--ro msdp!
      +--ro global
      |  +--ro connect-source?   if:interface-ref
      |  +--ro default-peer! {global-default-peer}?
      |  |  +--ro peer-addr        -> ../../../peers/peer/address
      |  |  +--ro prefix-policy?   string {global-default-peer-policy}?
      |  +--ro originating-rp
      |  |  +--ro interface?   if:interface-ref
      |  +--ro sa-filter
      |  |  +--ro in?    string
      |  |  +--ro out?   string
      |  +--ro ttl-threshold?    uint8
      +--ro peers
      |  +--ro peer* [address]
      |     +--ro address                 inet:ipv4-address
      |     +--ro authentication
      |     |  +--ro (authentication-type)?
      |     |     +--:(key-chain) {peer-key-chain}?
      |     |     |  +--ro key-chain?   key-chain:key-chain-ref
      |     |     +--:(password) {peer-key-chain}?
      |     |        +--ro key?         string
      |     +--ro enable?                 boolean {peer-admin-enable}?
      |     +--ro connect-source?         if:interface-ref
      |     +--ro description?            string {peer-description}?
      |     +--ro mesh-group?             string
      |     +--ro peer-as?                string {peer-as}?
      |     +--ro sa-filter
      |     |  +--ro in?    string
      |     |  +--ro out?   string
      |     +--ro timer

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      |     |  +--ro connect-retry-interval?   uint16 {peer-timer-connect-retry}?
      |     |  +--ro holdtime-interval?        uint16 {peer-timer-holdtime}?
      |     |  +--ro keepalive-interval?       uint16 {peer-timer-keepalive}?
      |     +--ro ttl-threshold?          uint8
      |     +--ro session-state?          enumeration
      |     +--ro elapsed-time?           uint32
      |     +--ro connect-retry-expire?   uint32
      |     +--ro hold-expire?            uint32
      |     +--ro is-default-peer?        boolean
      |     +--ro keepalive-expire?       uint32
      |     +--ro reset-count?            uint32
      |     +--ro statistics
      |        +--ro discontinuity-time?   yang:date-and-time
      |        +--ro error
      |        |  +--ro rpf-failure?   uint32
      |        +--ro queue
      |        |  +--ro size-in?    uint32
      |        |  +--ro size-out?   uint32
      |        +--ro received
      |        |  +--ro keepalive?      yang:counter64
      |        |  +--ro notification?   yang:counter64
      |        |  +--ro sa-message?     yang:counter64
      |        |  +--ro sa-response?    yang:counter64
      |        |  +--ro sa-request?     yang:counter64
      |        |  +--ro total?          yang:counter64
      |        +--ro sent
      |           +--ro keepalive?      yang:counter64
      |           +--ro notification?   yang:counter64
      |           +--ro sa-message?     yang:counter64
      |           +--ro sa-response?    yang:counter64
      |           +--ro sa-request?     yang:counter64
      |           +--ro total?          yang:counter64
      +--ro sa-cache
         +--ro entry* [group source-addr]
            +--ro group                inet:ipv4-address
            +--ro source-addr          union
            +--ro origin-rp* [rp-address]
            |  +--ro rp-address       inet:ip-address
            |  +--ro is-local-rp?     boolean
            |  +--ro sa-adv-expire?   uint32
            +--ro up-time?             uint32
            +--ro expire?              uint32
            +--ro holddown-interval?   uint32
            +--ro peer-learned-from?   inet:ipv4-address
            +--ro rpf-peer?            inet:ipv4-address
rpcs:
   +---x msdp-clear-peer
   |  +---w input

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   |     +---w peer-address?   inet:ipv4-address
   +---x msdp-clear-sa-cache {rpc-clear-sa-cache}?
      +---w input
         +---w entry!
         |  +---w group          inet:ipv4-address
         |  +---w source-addr?   union
         +---w peer-address?   inet:ipv4-address
         +---w peer-as?        string

3.  MSDP configuration

   The msdp peers should be configured.  And several peers may be in a
   mesh-group.  The Source-Active information may be filtered for peers.

4.  Notifications

   This part will be updated in later version.

5.  MSDP YANG module

   <CODE BEGINS> file "ietf-msdp@2016-07-06.yang"
   module ietf-msdp {
     namespace "urn:ietf:params:xml:ns:yang:ietf-msdp";
     // replace with IANA namespace when assigned
     prefix msdp;

     import ietf-yang-types {
       prefix "yang";
     }

     import ietf-inet-types {
       prefix "inet";
     }

     import ietf-routing {
       prefix "rt";
     }

     import ietf-interfaces {
       prefix "if";
     }

     import ietf-ip {
       prefix "ip";
     }

     import ietf-key-chain {
       prefix "key-chain";

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     }

     organization
       "IETF PIM( Protocols for IP Multicast ) Working Group";

     contact
       "WG Web:   <http://tools.ietf.org/wg/pim/>
        WG List:  <mailto:pim@ietf.org>
        WG Chair: Stig Venaas
                  <mailto:stig@venaas.com>
        WG Chair: Mike McBride
                  <mailto:mmcbride7@gmail.com>

        Editors:   ";

     description
       "The module defines the YANG definitions for MSDP.";

     revision 2016-07-06 {
       description
         "Initial revision.";
       reference
         "RFC XXXX: A YANG Data Model for MSDP.
          RFC 3618: Multicast Source Discovery Protocol (MSDP).
          RFC 4624: Multicast Source Discovery Protocol (MSDP) MIB";
     }

     /*
      * Features
      */
     feature global-connect-source {
       description
         "Support configuration of global connect-source.";
     }

     feature global-default-peer {
       description
         "Support configuration of global default peer.";
     }

     feature global-default-peer-policy {
       description
         "Support configuration of global default peer.";
     }

     feature global-sa-filter {
       description
         "Support configuration of global SA filter.";

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     }

     feature global-ttl-threshold {
       description
         "Support configuration of global ttl-threshold.";
     }

     feature rpc-clear-sa-cache {
       description
         "Support the rpc to clear SA cache.";
     }

     feature peer-admin-enable {
       description
         "Support configuration of peer administrative enabling.";
     }

     feature peer-as {
       description
         "Support configuration of peer AS number.";
     }

     feature peer-connect-source {
       description
         "Support configuration of global connect-source.";
     }

     feature peer-description {
       description
         "Support configuration of peer description.";
     }

     feature peer-key-chain {
       description
         "Support configuration of peer key-chain.";
     }

     feature peer-password {
       description
         "Support configuration of peer key-chain.";
     }

     feature peer-timer-connect-retry {
       description
         "Support configuration of peer timer for connect-retry.";
     }

     feature peer-timer-keepalive {

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       description
         "Support configuration of peer timer for keepalive.";
     }

     feature peer-timer-holdtime {
       description
         "Support configuration of peer timer for holdtime.";
     }

     /*
      * Typedefs
      */

     /*
      * Identities
      */

     /*
      * Groupings
      */
     grouping authentication-container {
       description
         "A container defining authentication attributes.";
       container authentication {
         description
           "A container defining authentication attributes.";
         choice authentication-type {
           case key-chain {
             if-feature peer-key-chain;
             leaf key-chain {
               type key-chain:key-chain-ref;
               description
                 "Reference to a key-chain.";
             }
           }
           case password {
             if-feature peer-key-chain;
             leaf key {
               type string;
               description
                 "This leaf describes the authentication key.";
             }
             uses key-chain:crypto-algorithm-types;
           }
           description
             "Choice of authentication.";
         }
       }

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     } // authentication-container

     grouping connect-source {
       description "Attribute to configure connect-source.";
       leaf connect-source {
         type if:interface-ref;
         must "/if:interfaces/if:interface[if:name = current()]/"
           + "ip:ipv4" {
           description
             "The interface must have IPv4 enabled.";
         }
         description
           "The interface is to be the source for the TCP connection.
            It is a reference to an entry in the global interface
            list.";
       }
     } // connect-source

     grouping global-config-attributes {
       description "Global MSDP configuration.";

       uses connect-source {
         if-feature global-connect-source;
       }
       container default-peer {
         if-feature global-default-peer;
         presence "";
         description
           "The default peer accepts all MSDP SA messages.
            A default peer is needed in topologies where MSDP peers do
            not coexist with BGP peers. The reverse path forwarding
            (RPF) check on SA messages can fail, and no SA messages are
            accepted. In these cases, you can configure the peer as a
            default peer and bypass RPF checks.";
         leaf peer-addr {
           type leafref {
             path "../../../peers/peer/address";
           }
           mandatory true;
           description
             "Reference to a peer that is in the peer list.";
         }
         leaf prefix-policy {
           if-feature global-default-peer-policy;
           type string;
           description
             "If specified, only those SA entries whose RP is permitted
              in the prefix list are allowed;

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              if not specified, all SA messages from the default peer
              are accepted.";
         }
       } // default-peer

       container originating-rp {
         description
           "The container of originating-rp.";
         leaf interface {
           type if:interface-ref;
           must "/if:interfaces/if:interface[if:name = current()]/"
             + "ip:ipv4" {
             description
               "The interface must have IPv4 enabled.";
           }
           description
             "Reference to an entry in the global interface
              list.
              IP address of the interface is used in the RP field of an
              SA message entry. When Anycast RPs are used, all RPs use
              the same IP address. This parameter can be used to define
              a unique IP address for the RP of each MSDP peer.
              By default, the software uses the RP address of the
              local system.";
         }
       } // originating-rp

       uses sa-filter-container {
         if-feature global-sa-filter;
       }
       uses ttl-threshold {
         if-feature global-ttl-threshold;
       }
     } // global-config-attributes

     grouping global-state-attributes {
       description "Global MSDP state attributes.";
     } // global-state-attributes

     grouping peer-config-attributes {
       description "Per peer configuration for MSDP.";

       uses authentication-container;
       leaf enable {
         if-feature peer-admin-enable;
         type boolean;
         description
           "true to enable peer;

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            false to disable peer.";
       }
       uses connect-source {
         if-feature peer-connect-source;
       }
       leaf description {
         if-feature peer-description;
         type string;
         description
           "The peer description.";
       }
       leaf mesh-group {
         type string;
         description
           "Configure this peer to be a member of a mesh group";
       }
       leaf peer-as {
         if-feature peer-as;
         type string;
         description
           "Peer's autonomous system number (ASN).";
       }
       uses sa-filter-container;
       container timer {
         description "Timer attributes.";
         leaf connect-retry-interval {
           if-feature peer-timer-connect-retry;
           type uint16;
           units seconds;
           default 30;
           description "SHOULD be set to 30 seconds. ";
         }
         leaf holdtime-interval {
           if-feature peer-timer-holdtime;
           type uint16;
           units seconds;
           must ". > 3";
           default 75;
           description "The SA-Hold-Down-Period of this msdp peer.";
         }
         leaf keepalive-interval {
           if-feature peer-timer-keepalive;
           type uint16;
           units seconds;
           must ". > 1 and . < ../holdtime-interval";
           default 60;
           description "The keepalive timer of this msdp peer.";
         }

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       } // timer
       uses ttl-threshold;
     } // peer-config-attributes

     grouping peer-state-attributes {
       description "Per peer state attributes for MSDP.";

       leaf session-state {
         type enumeration {
           enum disabled  {
             description "Disabled.";
           }
           enum inactive {
             description "Inactive.";
           }
           enum listen {
             description "Listen.";
           }
           enum connecting {
             description "Connecting.";
           }
           enum established {
             description "Established.";
           }
         }
         description
           "Peer session state.";
         reference
           "RFC3618: Multicast Source Discovery Protocol (MSDP).";
       }
       leaf elapsed-time {
         type uint32;
         units seconds;
         description "Elapsed time for being in a state.";
       }
       leaf connect-retry-expire {
         type uint32;
         units seconds;
         description "Connect retry expire time of peer connection.";
       }
       leaf hold-expire {
         type uint32;
         units seconds;
         description "Hold expire time of peer connection.";
       }
       leaf is-default-peer {
         type boolean;
         description "If this peer is default peer.";

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       }
       leaf keepalive-expire {
         type uint32;
         units seconds;
         description "Keepalive expire time of this peer.";
       }
       leaf reset-count {
         type uint32;
         description "The reset count of this peer.";
       }
       uses statistics-container;
     } // peer-config-attributes

     grouping sa-cache-state-attributes {
       description "SA cache state attributes for MSDP.";

       leaf up-time {
         type uint32;
         units seconds;
         description "The up time of this sa cache.";
       }
       leaf expire {
         type uint32;
         units seconds;
         description "If this cache has expired.";
       }
       leaf holddown-interval {
         type uint32;
         units seconds;
         description "Holddown timer value for SA forwarding.";
       }
       leaf peer-learned-from {
         type inet:ipv4-address;
         description
           "The address of peer that we learned this SA from .";
       }
       leaf rpf-peer {
         type inet:ipv4-address;
         description "RPF peer.";
       }
     } // sa-cache-state-attributes

     grouping sa-filter-container {
       description "A container defining SA filters.";
       container sa-filter {
         description
           "Specifies an access control list (ACL) to filter source
            active (SA) messages coming in to or going out of the

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            peer.";
         leaf in {
           type string;
           description
             "Filters incoming SA messages only.";
         }
         leaf out {
           type string;
           description
             "Filters outgoing SA messages only.";
         }
       } // sa-filter
     } // sa-filter-container

     grouping ttl-threshold {
       description "Attribute to configure TTL threshold.";
       leaf ttl-threshold {
         type uint8 {
           range 1..255;
         }
         description
           "Maximum number of hops data packets can traverse before
            being dropped.";
       }
     } // sa-ttl-threshold

     grouping statistics-container {
       description
         "A container defining statistics attributes.";
       container statistics {
         description "";
         leaf discontinuity-time {
           type yang:date-and-time;
           description
             "The time on the most recent occasion at which any one
             or more of the statistic counters suffered a
             discontinuity. If no such discontinuities have occurred
             since the last re-initialization of the local
             management subsystem, then this node contains the time
             the local management subsystem re-initialized itself.";
         }
         container error {
           description "";
           uses statistics-error;
         }
         container queue {
           description "";
           uses statistics-queue;

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         }
         container received {
           description "";
           uses statistics-sent-received;
         }
         container sent {
           description "";
           uses statistics-sent-received;
         }
       }
     } // statistics-container

     grouping statistics-error {
       description
         "A grouping defining error statistics
         attributes.";
       leaf rpf-failure {
         type uint32;
         description "";
       }
     } // statistics-error

     grouping statistics-queue {
       description
         "A grouping defining queue statistics
         attributes.";
       leaf size-in {
         type uint32;
         description
           "The size of the input queue.";
       }
       leaf size-out {
         type uint32;
         description
           "The size of the output queue.";
       }
     } // statistics-queue

     grouping statistics-sent-received {
       description
         "A grouping defining sent and received statistics
         attributes.";
       leaf keepalive {
         type yang:counter64;
         description
           "The number of keepalive messages.";
       }
       leaf notification {

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         type yang:counter64;
         description
           "The number of notification messages.";
       }
       leaf sa-message {
         type yang:counter64;
         description
           "The number of SA messages.";
       }
       leaf sa-response {
         type yang:counter64;
         description
           "The number of SA response messages.";
       }
       leaf sa-request {
         type yang:counter64;
         description
           "The number of SA request messages.";
       }
       leaf total {
         type yang:counter64;
         description
           "The number of total messages.";
       }
     } // statistics-sent-received

     /*
      * Configuration data nodes
      */
     augment "/rt:routing/rt:control-plane-protocols" {
       description
         "MSDP augmentation to routing instance configuration.";

       container msdp {
         presence "Container for MSDP protocol.";
         description
           "MSDP configuration data.";

         container global {
           description
             "Global attributes.";
           uses global-config-attributes;
         }

         container peers {
           description
             "Containing a list of peers.";

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           list peer {
             key "address";
             description
               "List of MSDP peers.";
             leaf address {
               type inet:ipv4-address;
               description
                 "";
             }
             uses peer-config-attributes;
           } // peer
         } // peers
       } // msdp
     } // augment

     /*
      * Operational state data nodes
      */
     augment "/rt:routing-state/rt:control-plane-protocols" {
       description
         "MSDP augmentation to routing instance state.";

       container msdp {
         presence "Container for MSDP protocol.";
         description
           "MSDP state data.";

         container global {
           description
             "Global attributes.";
           uses global-config-attributes;
           uses global-state-attributes;
         }

         container peers {
           description
             "Containing a list of peers.";

           list peer {
             key "address";
             description
               "List of MSDP peers.";
             leaf address {
               type inet:ipv4-address;
               description
                 "The address of peer";
             }
             uses peer-config-attributes;

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             uses peer-state-attributes;
           } // peer
         } // peers

         container sa-cache {
           description
             "The sa cache information.";
           list entry {
             key "group source-addr";
             description "";
             leaf group {
               type inet:ipv4-address;
               description "The group address of this sa cache.";
             }
             leaf source-addr {
               type union {
                 type enumeration {
                   enum '*' {
                     description "The source addr of this sa cache.";
                   }
                 }
                 type inet:ipv4-address;
               }
               description "";
             }
             list origin-rp {
               key "rp-address";
               description
                 "";
               leaf rp-address {
                 type inet:ip-address;
                 description "The rp address.";
               }
               leaf is-local-rp {
                 type boolean;
                 description "";
               }
               leaf sa-adv-expire {
                 type uint32;
                 units seconds;
                 description
                   "Periodic SA advertisement timer exipiring time on
                    a local RP.";
               }
             }
             uses sa-cache-state-attributes;
           } // entry
         } // sa-cache

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       } // msdp
     } // augment

     /*
      * RPCs
      */
     rpc msdp-clear-peer {
       description
         "Clears the session to the peer.";
       input {
         leaf peer-address {
           type inet:ipv4-address;
           description
             "Address of peer to be cleared. If this is not provided
              then all peers are cleared.";
         }
       }
     }

     rpc msdp-clear-sa-cache {
       if-feature rpc-clear-sa-cache;
       description
         "Clears MSDP source active (SA) cache entries.";
       input {
         container entry {
           presence "";
           description
             "The SA cache (S,G) or (*,G) entry to be cleared. If this
              is not provided, all entries are cleared.";
           leaf group {
             type inet:ipv4-address;
             mandatory true;
             description "";
           }
           leaf source-addr {
             type union {
               type enumeration {
                 enum '*' {
                   description "";
                 }
               }
               type inet:ipv4-address;
             }
             description "";
           }
         } // s-g
         leaf peer-address {
           type inet:ipv4-address;

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           description
             "Peer IP address from which MSDP SA cache entries have been
              learned. If this is not provided, entries learned from all
              peers are cleared.";
         }
         leaf peer-as {
           type string;
           description
             "ASN from which MSDP SA cache entries have been learned.
              If this is not provided, entries learned from all AS's
              are cleared.";
         }
       }
     }

     /*
      * Notifications
      */
   }
   <CODE ENDS>

6.  Contributors

   The authors would like to thank Yisong Liu (liuyisong@huawei.com),
   Benchong Xu (xu.benchong@zte.com.cn), Tanmoy Kundu
   (tanmoy.kundu@alcatel-lucent.com) for their valuable contributions.

7.  Normative References

   [I-D.ietf-netmod-routing-cfg]
              Lhotka, L. and A. Lindem, "A YANG Data Model for Routing
              Management", draft-ietf-netmod-routing-cfg-22 (work in
              progress), July 2016.

   [RFC3618]  Fenner, B., Ed. and D. Meyer, Ed., "Multicast Source
              Discovery Protocol (MSDP)", RFC 3618,
              DOI 10.17487/RFC3618, October 2003,
              <http://www.rfc-editor.org/info/rfc3618>.

   [RFC4624]  Fenner, B. and D. Thaler, "Multicast Source Discovery
              Protocol (MSDP) MIB", RFC 4624, DOI 10.17487/RFC4624,
              October 2006, <http://www.rfc-editor.org/info/rfc4624>.

   [RFC6087]  Bierman, A., "Guidelines for Authors and Reviewers of YANG
              Data Model Documents", RFC 6087, DOI 10.17487/RFC6087,
              January 2011, <http://www.rfc-editor.org/info/rfc6087>.

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Authors' Addresses

   Xufeng Liu
   Ericsson
   1595 Spring Hill Road, Suite 500
   Vienna  VA 22182
   USA

   Email: xliu@kuatrotech.com

   Zheng(Sandy) Zhang
   ZTE Corporation
   No. 50 Software Ave, Yuhuatai Distinct
   Nanjing
   China

   Email: zhang.zheng@zte.com.cn

   Anish Peter
   Juniper Networks
   Electra, Exora Business Park
   Bangalore, KA  560103
   India

   Email: anishp@juniper.net

   Mahesh Sivakumar
   Cisco Systems
   510 McCarthy Boulevard
   Milpitas, California
   USA

   Email: masivaku@cisco.com

   Feng Guo
   Huawei Technologies
   Huawei Bld., No.156 Beiqing Rd.
   Beijing  100095
   China

   Email: guofeng@huawei.com

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   Pete McAllister
   Metaswitch Networks
   100 Church Street
   Enfield  EN2 6BQ
   UK

   Email: pete.mcallister@metaswitch.com

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