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Versions: (draft-chh-bier-bier-yang) 00 01 02

BIER WG                                                        Ran. Chen
Internet-Draft                                               Fangwei. Hu
Intended status: Standards Track                            Zheng. Zhang
Expires: February 11, 2018                                  Xianxia. Dai
                                                         ZTE Corporation
                                                       Mahesh. Sivakumar
                                                     Cisco Systems, Inc.
                                                         August 10, 2017


                   YANG Data Model for BIER Protocol
                    draft-ietf-bier-bier-yang-02.txt

Abstract

   This document defines a YANG data model for BIER 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 February 11, 2018.

Copyright Notice

   Copyright (c) 2017 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




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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.  Design of the Data Model  . . . . . . . . . . . . . . . . . .   2
   3.  Configuration . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Control plane configuration . . . . . . . . . . . . . . . . .   4
   5.  States  . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   6.  Notification  . . . . . . . . . . . . . . . . . . . . . . . .   5
   7.  BIER YANG Data Model  . . . . . . . . . . . . . . . . . . . .   5
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  16
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  16
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  16
   11. Normative references  . . . . . . . . . . . . . . . . . . . .  17
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  18

1.  Introduction

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

2.  Design of the Data Model

module: ietf-bier
augment /rt:routing:
   +--rw bier
   |  +--rw bier-global
   |     +--rw encapsulation-type?   identityref
   |     +--rw bitstringlength?      bsl
   |     +--rw bfr-id?               bfr-id
   |     +--rw ipv4-bfr-prefix?   inet:ipv4-prefix
   |     +--rw ipv6-bfr-prefix?   inet:ipv6-prefix
   |     +--rw sub-domain* [sub-domain-id]
   |        +--rw sub-domain-id      sub-domain-id
   |        +--rw igp-type?          igp-type
   |        +--rw mt-id?             mt-id
   |        +--rw bfr-id?            bfr-id
   |        +--rw bitstringlength?   bsl
   |        +--rw af
   |           +--rw ipv4* [bitstringlength bier-mpls-label-base]
   |           |  +--rw bitstringlength               uint16
   |           |  +--rw bier-mpls-label-base          rt-types:mpls-label
   |           |  +--rw bier-mpls-label-range-size?   bier-mpls-label-range-size
   |           +--rw ipv6* [bitstringlength bier-mpls-label-base]
   |              +--rw bitstrin+--glength               uint16
   |              +--rw bier-mpls-label-base          rt-types:mpls-label



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   |              +--rw bier-mpls-label-range-size?   bier-mpls-label-range-size
   +--ro bier-state
      +---bier-global-state
      |    +--ro encapsulation-type?   identityref
      |    +--ro bitstringlength?      bsl
      |    +--ro bfr-id?               bfr-id
      |    +--ro ipv4-bfr-prefix?      inet:ipv4-prefix
      |    +--ro ipv6-bfr-prefix?      inet:ipv6-prefix
      |    +--ro sub-domain* [sub-domain-id]
      |    +--ro sub-domain-id    sub-domain-id
      |    +--ro igp-type         igp-type
      |    +--ro mt-id?           mt-id
      |    +--ro bfr-id?          bfr-id
      |    +--rw bitstringlength?   bsl
      |    +--ro ipv4* [bitstringlength bier-mpls-label-base]
      |    |  +--ro bitstringlength               uint16
      |    |  +--ro bier-mpls-label-base          rt-types:mpls-label
      |    |  +--ro bier-mpls-label-range-size?   bier-mpls-label-range-size
      |    +--ro ipv6* [bitstringlength bier-mpls-label-base]
      |       +--ro bitstringlength               uint16
      |       +--ro bier-mpls-label-base          rt-types:mpls-label
      |       +--ro bier-mpls-label-range-size?   bier-mpls-label-range-size
      +--ro birts-state
         +--ro birt* [sub-domain-id]
            +--ro sub-domain-id           sub-domain-id
            +--ro birt-bitstringlength* [bitstringlength]
               +--ro bitstringlength    uint16
               +--ro birt-si* [si]
                  +--ro si                     si
                  +--ro f-bm?                  uint16
                  +--ro bier-mpls-in-label?    rt-types:mpls-label
                  +--ro bfr-nbr?               inet:ip-address
                  +--ro bier-mpls-out-label?   rt-types:mpls-label

  augment /rt:routing/rt:control-plane-protocols/rt:control-plane-protocol/ospf:ospf/ospf:instance:
   +--rw bier-ospf-cfg
      +--rw mt-id          mt-id
      +--rw bier-global
         +--rw enable?      boolean
         +--rw advertise?   boolean
         +--rw receive?     boolean

  augment /rt:routing/rt:control-plane-protocols/rt:control-plane-protocol/isis:isis:
   +--rw bier-isis-cfg
      +--rw mt-id          mt-id
      +--rw bier-global
         +--rw enable?      boolean
         +--rw advertise?   boolean



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         +--rw receive?     boolean


notifications:
   +---n bfr-id-collision
   |  +--ro bfr-id?   bfr-id
   +---n bfr-zero
   |  +--ro ipv4-bfr-prefix?   inet:ipv4-prefix
   |  +--ro ipv6-bfr-prefix?   inet:ipv6-prefix
   +---n sub-domain-id-collision
      +--ro sub-domain-id?   sub-domain-id
      +--ro mt-id?           uint16


3.  Configuration

   This Module augments the "/rt:routing:" with a BIER container.  This
   Container defines all the configuration parameters related to BIER
   for this particular routing.

   The BIER configuration contains global configuration.

   The global configuration includes BIER encapsulation type, imposition
   BitStringLengths, BFR-id, BFR-prefixes, and parameters associated
   with bier sub-domain.

   In this document, we contains two types of BitStringLengths:
   Imposition and Disposition BitStringLengths, as defined in
   ([I-D.ietf-bier-architecture]).The imposition BitStringLengths is
   defined under bier-global container, and the disposition
   BitStringLengths is defined under the sub-domain.

4.  Control plane configuration

   This Module augments the "/rt:routing/rt:routing-protocols/
   rt:routing-protocol/ospf:ospf/ospf:instance:" and "/rt:routing/
   rt:routing-protocols/rt:routing-protocol/isis:isis:"configuration
   with BIER.

   This Module supports ISIS ([I-D.ietf-bier-isis-extensions])and OSPF
   ([I-D.ietf-bier-ospf-bier-extensions]) as control plane for BIER.

5.  States

   The operational states contains basic parameters associated with
   bier, such as BIER encapsulation type, BitStringLengths, BFR-id, BFR-
   prefixes, and parameters associated with bier sub-domain.




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   It also includes the Bit Index Routing Table(BIRT).

6.  Notification

   This Module includes bfr-id-collision, bfr-zero, and sub-domain-id-
   collision.

7.  BIER YANG Data Model

<CODE BEGINS> file "ietf-bier.yang"
module ietf-bier {

     namespace "urn:ietf:params:xml:ns:yang:ietf-bier";

     prefix "bier";

     import ietf-routing {
       prefix "rt";
     }

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

        import ietf-routing-types {
      prefix "rt-types";
     }

         import ietf-isis{
       prefix "isis";
     }

     import ietf-ospf  {
       prefix "ospf";
     }

     organization
       "IETF BIER(Bit Indexed Explicit Replication ) Working Group";

     contact
        "WG List:  <mailto:bier@ietf.org>

        WG Chair: Tony Przygienda
                  <mailto:tonysietf@gmail.com>

        WG Chair: Greg Shepherd
                  <mailto:gjshep@gmail.com>




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        Editor:   Ran Chen
                   <mailto:chen.ran@zte.com.cn>
        Editor:   Fangwei Hu
                   <mailto:hu.fangwei@zte.com.cn>
        Editor:   Zheng Zhang
                   <mailto:zhang.zheng@zte.com.cn>
        Editor:   Xianxian Dai
                   <mailto:dai.xianxian@zte.com.cn>
        Editor:    Mahesh Sivakumar
                   <mailto:masivaku@cisco.com>
        ";
       description
         "The YANG module defines a generic configuration
          model for BIER.";

                revision 2017-08-10{
         description
           "02 revision";
         reference
           "draft-ietf-bier-bier-yang-02";
       }


        revision 2017-01-20{
         description
           "01 revision";
         reference
           "draft-ietf-bier-bier-yang-01";
       }

                revision 2016-07-23{
         description
           "00 revision";
         reference
           "draft-ietf-bier-bier-yang-00";
       }

           revision 2016-05-12{
         description
           "04 revision";
         reference
           "draft-chh-bier-bier-yang-04";
       }

       revision 2016-03-16 {
         description
           "03 revision";
         reference



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           "draft-chh-bier-bier-yang-03";
       }

       revision 2015-12-03 {
         description
           "02 revision";
         reference
           "draft-chh-bier-bier-yang-02";
       }

       revision 2015-10-16 {
         description
           "01 revision.";
         reference
           "draft-chh-bier-bier-yang-01";
       }

       revision 2015-06-22 {
         description
           "Initial revision.";
         reference
           "draft-chh-bier-bier-yang-00";
     }

     /* Identities */
     identity bier-encapsulation{
       description
         "Base identity for BIER encapsulation.";
     }
     identity bier-encapsulation-mpls {
       base bier-encapsulation;
       description
         "This identity represents MPLS encapsulation for bier.";
     }

        /*Typedefs*/

        typedef sub-domain-id {
          type uint16;
          description
            "The type for sub-domain-id";
         }

        typedef si {
          type uint16;
          description
            "The type for set identifier";
         }



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         typedef bfr-id {
           type uint16;
           description
             "The type for bfr identifier";
         }

         typedef mt-id {
           type uint16;
           description
             "The type for multi-topology identifier";
         }

         typedef bier-mpls-label-range-size{
           type uint8;
           description
                 "The type for BIER label range size.";
                }

         typedef bsl {
           type enumeration{
                 enum 64-bit{
                   value 1;
                   description
                     "bitstringlength is 64";
                        }
                 enum 128-bit{
                   value 2;
                   description
                         "bitstringlength is 128";
                        }
                 enum 256-bit{
                   value 3;
                   description
                     "bitstringlength is 256";
                        }
                 enum 512-bit{
                   value 4;
                         description
                           "bitstringlength is 512";
                        }
                 enum 1024-bit{
                   value 5;
                   description
                     "bitstringlength is 1024";
                        }
                 enum 2048-bit{
                   value 6;
                   description



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                     "bitstringlength is 2048";
                        }
                 enum 4096-bit{
                   value 7;
                   description
                     "bitstringlength is 4096";
                        }
                }
                 description
                   "The bitstringlength type for imposition mode";
       }

         typedef igp-type {
           type enumeration{
                 enum ISIS{
                   value 1;
                   description
                     "isis protocol";
                        }
                 enum OSPF{
                   value 2;
                   description
                     "ospf protocol";
                        }
                  }
         description
                   "The IGP type";
                 }

        /*grouping*/
          grouping bier-protocol-extensions{
                leaf mt-id{
                  type mt-id;
                  description
                        "Multi-topology associated with bier sub-domain.";
                 }
            container bier-global {
                  leaf enable {
                    type boolean;
                        default false;
                        description
                          "Enables bier protocol extensions.";
                  }
                  leaf advertise {
                        type boolean;
                        default true;
                        description
                          "Enable to advertise the parameters associated with bier.";



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                        }
                  leaf receive {
                        type boolean;
                        default true;
                        description
                          "Enable to receive the parameters associated with bier.";
                        }
                  description
                        "BIER global config.";
                }
           description
                 "Defines protocol extensions.";
           }

          grouping bier-parameters{
                leaf encapsulation-type {
                  type identityref {
                    base bier-encapsulation;
                        }
                  default "bier-encapsulation-mpls";
                  description
                        "Dataplane to be used.";
                }
                leaf bitstringlength{
                  type bsl;
                  description
                    "imposition bitstringlength.";
                }
                leaf bfr-id {
                  type bfr-id;
                  description
                        "BIER bfr identifier.";
                }
                leaf ipv4-bfr-prefix {
                  type inet:ipv4-prefix;
                  description
                        "BIER IPv4 prefix.";
                }
                leaf ipv6-bfr-prefix {
                  type  inet:ipv6-prefix;
                  description
                        "BIER IPv6 prefix.";
                }
          description
            " BIER parameters.";
          }

          grouping bier-mpls-cfg{



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                leaf bitstringlength {
                  type uint16;
                  description
                        "BIER bitstringlength.";
                }
                leaf bier-mpls-label-base{
                  type rt-types:mpls-label;
                  description
                        "BIER label base.";
                }
                leaf bier-mpls-label-range-size{
                  type bier-mpls-label-range-size;
                  description
                        "BIER label range.";
                }
          description
                "Defines the necessary label ranges per bitstring length.";
          }

      augment "/rt:routing" {
            description
                  "This augments routing-instance configuration with bier.";
            container bier{
                  container bier-global {
                    uses bier-parameters;
                        list sub-domain{
              key "sub-domain-id";
                      leaf sub-domain-id{
                        type sub-domain-id;
                        description
                            "sub-domain ID.";
                       }
                      leaf igp-type {
                        type igp-type;
                        description
                            "IGP type.";
                      }
                     leaf mt-id {
                       type mt-id;
                       description
                           "multi-topology ID.";
                      }
                      leaf bfr-id{
                        type bfr-id;
                        description
                            "BIER bfr identifier.";
                      }




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              leaf bitstringlength{
                                type bsl;
                                  description
                                        "Disposition bitstringlength.";
                             }

                          container af {
                                list ipv4 {
                                  key "bitstringlength bier-mpls-label-base";
                                  uses bier-mpls-cfg;

                                  description
                                        "Defines the necessary label ranges per bitstring length in ipv4.";
                                        }
                                list ipv6 {
                                  key "bitstringlength bier-mpls-label-base";
                                  uses bier-mpls-cfg;

                                  description
                                    "Defines the necessary label ranges per bitstring length in ipv6.";
                                        }
                          description
                                "Bier mapping entries.";
                                }
            description
              "Denfines subdomain configuration";
                }
                description
                  "BIER global config.";
                }
             description "BIER config.";
            }
       container bier-state{
             config false;
                 description
                   "BIER operational state.";
                 container bier-global-state{
                   config false;
                   uses bier-parameters;
           list sub-domain{
              key "sub-domain-id";
                      leaf sub-domain-id{
                      type sub-domain-id;
                      description
                            "sub-domain ID.";
                    }
                   leaf igp-type {
                   type igp-type;



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                   description
                        "IGP type.";
                   }
                  leaf mt-id {
                    type mt-id;
                    description
                          "multi-topology ID.";
                   }
                  leaf bfr-id{
                    type bfr-id;
                    description
                          "BIER bfr identifier.";
                  }

           leaf bitstringlength{
                     type bsl;
                         description
                           "Disposition bitstringlength.";
                 }
                        list ipv4 {
                          key "bitstringlength bier-mpls-label-base";
                          uses bier-mpls-cfg;
                            description
                                  "Show the necessary label ranges per bitstring length in ipv4.";
                                }
                        list ipv6 {
                          key "bitstringlength bier-mpls-label-base";
                                uses bier-mpls-cfg;
                                  description
                                        "Show the necessary label ranges per bitstring length in ipv6.";
                                }
                        description
              "Denfines subdomain configuration";
                }
            description
                          "Parameters associated with bier.";
                        }

                container birts-state{
                  list birt{
                        key "sub-domain-id";
                        leaf sub-domain-id{
                          type sub-domain-id;
                                description
                                  "BIER sub domain ID";
                                }
                        list birt-bitstringlength {
                          key "bitstringlength";



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                          leaf bitstringlength{
                                type uint16;
                                  description
                                        "BIER bitstringlength.";
                             }
                          list birt-si {
                                key "si";
                                leaf si{
                                  type si;
                                  description
                                        "BIER set identifier.";
                                        }
                                leaf f-bm{
                                  type uint16;
                                  description
                                        "BIER Forwarding Bit Mask.";
                                                }
                                leaf bier-mpls-in-label{
                                  type rt-types:mpls-label;
                                  description
                                        "BIER in-label.";
                                                }
                                leaf bfr-nbr{
                                  type inet:ip-address;
                                  description
                                  "BIER BFR Neighbors.";
                                                }
                                leaf bier-mpls-out-label{
                                  type rt-types:mpls-label;
                                  description
                                        "BIER out-label.";
                                                }
                           description
                                 "Query the BIRT based on the key set identifier & bitstringlength & sub-domain-id.";
                                }
                        description
                          "Query the BIRT based on the key bitstringlengt & sub-domain-id.";
                                }
                   description
                         "Query the BIRT based on the key sub-domain.";
            }
                  description
                        "Shows Bit Index Routing Table.";
                  }
           }
      }

     augment "/rt:routing/rt:control-plane-protocols/"



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           + "rt:control-plane-protocol/ospf:ospf/ospf:instance" {
       when "../../rt:type = 'ospf:ospfv2' or
             ../../rt:type = 'ospf:ospfv3'" {
         description
           "This augments the ospf routing protocol when used";
         }
       description
         "This augments ospf protocol configuration with bier.";
                container bier-ospf-cfg{
                  uses bier-protocol-extensions;
          description
                        "Control of bier advertisement and reception.";
                }
      }

     augment "/rt:routing/rt:control-plane-protocols/"
             +"rt:control-plane-protocol/isis:isis"{
       when "/rt:routing/rt:control-plane-protocols/"+
           "rt:control-plane-protocol/rt:type = 'isis:isis'" {
         description
         "This augment ISIS routing protocol when used";
       }
       description
         "This augments ISIS protocol configuration with bier.";
                  container bier-isis-cfg{
            uses bier-protocol-extensions;
                        description
                          "Control of bier advertisement and reception.";

                }
      }




          /* Notifications */
      notification bfr-id-collision{
                leaf bfr-id{
                  type bfr-id;
                  description
                        "BIER BFR ID.";
        }
           description
                 "BFR ID received in the controlplane that caused BFR ID collision.";
       }

      notification bfr-zero{
                leaf ipv4-bfr-prefix{



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                  type inet:ipv4-prefix;
                  description
                        "BIER ipv4 bfr prefix";
         }
                leaf ipv6-bfr-prefix{
                  type inet:ipv6-prefix;
                  description
                        "BIER ipv6 bfr prefix";
        }
                description
                        "Invalid value associated with prefix";
       }

      notification sub-domain-id-collision{
                leaf sub-domain-id{
                  type sub-domain-id;
                  description
                        "BIER sub domain ID";
        }
                leaf mt-id{
                  type uint16;
                  description
                        "Multi-topology ID";
        }
           description
                 "Sub domain ID received in the controlplane that caused Sub domain ID collision";
       }
     }

 <CODE ENDS>

8.  Security Considerations

   TBD.

9.  Acknowledgements

   We would like to thank IJsbrand Wijnands, Reshad Rahman and Giles
   Heron for their comments and support of this work.

10.  IANA Considerations

   This document requires no IANA Actions.  Please remove this section
   before RFC publication.







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11.  Normative references

   [I-D.ietf-bier-architecture]
              Wijnands, I., Rosen, E., Dolganow, A., Przygienda, T., and
              S. Aldrin, "Multicast using Bit Index Explicit
              Replication", draft-ietf-bier-architecture-07 (work in
              progress), June 2017.

   [I-D.ietf-bier-isis-extensions]
              Ginsberg, L., Przygienda, T., Aldrin, S., and Z. Zhang,
              "BIER support via ISIS", draft-ietf-bier-isis-
              extensions-05 (work in progress), July 2017.

   [I-D.ietf-bier-mpls-encapsulation]
              Wijnands, I., Rosen, E., Dolganow, A., Tantsura, J.,
              Aldrin, S., and I. Meilik, "Encapsulation for Bit Index
              Explicit Replication in MPLS and non-MPLS Networks",
              draft-ietf-bier-mpls-encapsulation-07 (work in progress),
              June 2017.

   [I-D.ietf-bier-ospf-bier-extensions]
              Psenak, P., Kumar, N., Wijnands, I., Dolganow, A.,
              Przygienda, T., Zhang, Z., and S. Aldrin, "OSPF Extensions
              for BIER", draft-ietf-bier-ospf-bier-extensions-07 (work
              in progress), July 2017.

   [I-D.ietf-isis-yang-isis-cfg]
              Litkowski, S., Yeung, D., Lindem, A., Zhang, Z., and L.
              Lhotka, "YANG Data Model for IS-IS protocol", draft-ietf-
              isis-yang-isis-cfg-18 (work in progress), July 2017.

   [I-D.ietf-mpls-base-yang]
              Raza, K., Gandhi, R., Liu, X., Beeram, V., Saad, T.,
              Bryskin, I., Chen, X., Jones, R., and B. Wen, "A YANG Data
              Model for MPLS Base", draft-ietf-mpls-base-yang-05 (work
              in progress), July 2017.

   [I-D.ietf-mpls-static-yang]
              Saad, T., Raza, K., Gandhi, R., Liu, X., Beeram, V., Shah,
              H., Bryskin, I., Chen, X., Jones, R., and B. Wen, "A YANG
              Data Model for MPLS Static LSPs", draft-ietf-mpls-static-
              yang-04 (work in progress), July 2017.

   [I-D.ietf-netmod-routing-cfg]
              Lhotka, L. and A. Lindem, "A YANG Data Model for Routing
              Management", draft-ietf-netmod-routing-cfg-25 (work in
              progress), November 2016.




Chen, et al.            Expires February 11, 2018              [Page 17]


Internet-Draft                  BIER YANG                    August 2017


   [I-D.ietf-ospf-yang]
              Yeung, D., Qu, Y., Zhang, Z., Chen, I., and A. Lindem,
              "Yang Data Model for OSPF Protocol", draft-ietf-ospf-
              yang-08 (work in progress), July 2017.

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

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

   [RFC6991]  Schoenwaelder, J., Ed., "Common YANG Data Types",
              RFC 6991, DOI 10.17487/RFC6991, July 2013,
              <http://www.rfc-editor.org/info/rfc6991>.

   [RFC7223]  Bjorklund, M., "A YANG Data Model for Interface
              Management", RFC 7223, DOI 10.17487/RFC7223, May 2014,
              <http://www.rfc-editor.org/info/rfc7223>.

Authors' Addresses

   Ran Chen
   ZTE Corporation
   No.50 Software Avenue,Yuhuatai District
   Nanjing, Jiangsu Province  210012
   China

   Phone: +86 025 88014636
   Email: chen.ran@zte.com.cn


   Fangwei Hu
   ZTE Corporation
   No.889 Bibo Rd
   Shanghai  201203
   China

   Phone: +86 21 68896273
   Email: hu.fangwei@zte.com.cn








Chen, et al.            Expires February 11, 2018              [Page 18]


Internet-Draft                  BIER YANG                    August 2017


   Zheng Zhang
   ZTE Corporation
   No.50 Software Avenue,Yuhuatai District
   Nanjing, Jiangsu Province  210012
   China

   Email: zhang.zheng@zte.com.cn


   Xianxian Dai
   ZTE Corporation
   No.50 Software Avenue,Yuhuatai District
   Nanjing, Jiangsu Province  210012
   China

   Email: Dai.xianxian@zte.com.cn


   Mahesh Sivakumar
   Cisco Systems, Inc.
   510 McCarthy Blvd
   Milpitas,California 95035
   United States

   Email: masivaku@cisco.com


























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