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Versions: 00

Network Working Group                                              Z. Hu
Internet-Draft                                       Huawei Technologies
Intended status: Standards Track                                 K. Raza
Expires: April 25, 2019                              Cisco Systems, Inc.
                                                                   Y. Qu
                                                                 J. Dong
                                                     Huawei Technologies
                                                        October 22, 2018


                     YANG Data Model for OSPF SRv6
                     draft-hu-lsr-ospf-srv6-yang-00

Abstract

   This document defines a YANG data model that can be used to configure
   and manage OSPF SRv6 [I-D.li-ospf-ospfv3-srv6-extensions].

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 RFC 2119 [RFC2119].

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 https://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 April 25, 2019.

Copyright Notice

   Copyright (c) 2018 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



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   (https://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.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  OSPF SRv6 . . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  OSPF SRv6 configuration . . . . . . . . . . . . . . . . . . .   4
     3.1.  SRv6 activation . . . . . . . . . . . . . . . . . . . . .   4
     3.2.  IP Fast reroute . . . . . . . . . . . . . . . . . . . . .   4
   4.  OSPF SRv6 YANG Module . . . . . . . . . . . . . . . . . . . .   4
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  15
   6.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  15
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  15
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  15
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  16
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  17

1.  Overview

   YANG[RFC6020][RFC7950] is a data definition language used to define
   the contents of a conceptual data store that allows networked devices
   to be managed using NETCONF[RFC6241].  YANG is proving relevant
   beyond its initial confines, as bindings to other interfaces (e.g.,
   ReST) and encodings other than XML (e.g., JSON) are being defined.
   Furthermore, YANG data models can be used as the basis for
   implementation of other interfaces, such as CLI and programmatic
   APIs.

   This document defines a YANG data model that can be used to configure
   and manage OSPF SRv6 and it is an augmentation to the OSPF YANG data
   model.

2.  OSPF SRv6

   This document defines a model for OSPF SRv6 feature.  It is an
   augmentation of the OSPF base model.

   The OSPF SRv6 YANG module requires support of OSPF base model
   [I-D.ietf-ospf-yang] which defines basic OSPF configuration and
   state.





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   The figure below describes the overall structure of the ospf-srv6
   YANG module:

   module: ietf-ospf-srv6
     augment /rt:routing/rt:control-plane-protocols
             /rt:control-plane-protocol/ospf:ospf:
       +--rw srv6-cfg
          +--rw enable?                 boolean
          +--rw persistent-end-x-sid?   boolean
     augment /rt:routing/rt:control-plane-protocols
             /rt:control-plane-protocol/ospf:ospf/ospf:areas
            /ospf:area/ospf:interfaces/ospf:interface/ospf:fast-reroute:
       +--rw srv6-ti-lfa {srv6-ti-lfa}?
          +--rw enable?   boolean
     augment /rt:routing/rt:control-plane-protocols
             /rt:control-plane-protocol/ospf:ospf/ospf:areas
             /ospf:area/ospf:interfaces/ospf:interface/ospf:database
             /ospf:link-scope-lsa-type/ospf:link-scope-lsas
             /ospf:link-scope-lsa/ospf:version/ospf:ospfv3
             /ospf:ospfv3/ospf:body/ospf:router-information:
       +--ro srv6-capability
          +--ro flags?            bits
          +--ro srv6-msd-value
             +--ro max-segments-left?   uint8
             +--ro max-end-pop?         uint8
             +--ro max-t-insert?        uint8
             +--ro max-t-encap?         uint8
             +--ro max-end-d?           uint8
     augment /rt:routing/rt:control-plane-protocols
             /rt:control-plane-protocol/ospf:ospf/ospf:areas
             /ospf:area/ospf:interfaces/ospf:interface/ospf:database
             /ospf:link-scope-lsa-type/ospf:link-scope-lsas
             /ospf:link-scope-lsa/ospf:version/ospf:ospfv3
             /ospf:ospfv3/ospf:body/ospfv3-e-lsa:e-router/
             /ospfv3-e-lsa:e-router-tlvs/ospfv3-e-lsa:link-tlv
             /ospfv3-e-lsa:sub-tlvs:
       +--ro srv6-endx-sids-sub-tlv
          +--ro endx-sid* [sid]
             +--ro endpoint-func
             |  +--ro fuc-flags?                 uint8
             |  +--ro endpoint-func?             identityref
             |  +--ro undefined-endpoint-func?   uint16
             +--ro sid-flags?            uint8
             +--ro sid-size?             uint8
             +--ro sid                   srv6-sid-value
             +--ro neighbor-router-id?   yang:dotted-quad
     augment /rt:routing/rt:control-plane-protocols
             /rt:control-plane-protocol/ospf:ospf/ospf:areas



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             /ospf:area/ospf:interfaces/ospf:interface
             /ospf:database/ospf:link-scope-lsa-type
             /ospf:link-scope-lsas/ospf:link-scope-lsa
             /ospf:version/ospf:ospfv3/ospf:ospfv3/ospf:body
   /ospf:router-information:
       +--ro srv6-node-sids
          +--ro srv6-node-sids* [sid]
             +--ro endpoint-func
             |  +--ro fuc-flags?                 uint8
             |  +--ro endpoint-func?             identityref
             |  +--ro undefined-endpoint-func?   uint16
             +--ro sid-flags?            uint8
             +--ro sid-size?             uint8
             +--ro sid                   srv6-sid-value
             +--ro neighbor-router-id?   yang:dotted-quad

3.  OSPF SRv6 configuration

3.1.  SRv6 activation

   Activation of OSPF SRv6 is done by setting the "enable" leaf to true.
   This triggers advertisement of SRv6 extensions based on the
   configuration parameters that have been setup using the base SRv6
   module.

3.2.  IP Fast reroute

   OSPF SRv6 model augments the fast-reroute container under interface.
   It brings the ability to activate ipv6 TI-LFA (topology independent
   LFA).

4.  OSPF SRv6 YANG Module

<CODE BEGINS> file "ietf-ospf-srv6@2018-10-11.yang"
module ietf-ospf-srv6 {
  namespace "urn:ietf:params:xml:ns:"
          + "yang:ietf-ospf-srv6";
  prefix ospf-srv6;

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

  import ietf-routing {
    prefix "rt";
  }

  import ietf-ospfv3-extended-lsa {



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    prefix "ospfv3-e-lsa";
  }

  import ietf-ospf {
    prefix "ospf";
  }

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

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

  organization
   "IETF OSPF - OSPF Working Group";

  contact
    "WG List:  &lt;mailto:spring@ietf.org&gt;
        Zhibo Hu
          &lt;mailto:huzhibo@huawei.com&gt;
        Jiajia Dong
          &lt;mailto:dongjiajia@huawei.com&gt;
    ";

  description
    "The YANG module defines a generic configuration model for
    Segment IPV6 routing OSPFv3 extensions common across all of the vendor
    implementations.";

  revision 2018-10-11 {
    description
        "Initial revision.";
    reference "RFC XXXX";
  }

  /* Identities */
  identity SRV6_END_FUNC_TYPE {
    description
    "Base identity type for srv6 endpoint function code points.";
  }

  identity SRV6_END_FUNC_NO_PSP_USP {
    base "SRV6_END_FUNC_TYPE";
    description
    "End (no PSP, no USP).";
  }



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  identity SRV6_END_FUNC_PSP {
    base "SRV6_END_FUNC_TYPE";
    description
    "End with PSP.";
  }

  identity SRV6_END_FUNC_USP {
    base "SRV6_END_FUNC_TYPE";
    description
    "END with USP.";
  }

  identity SRV6_END_FUNC_PSP_USP {
    base "SRV6_END_FUNC_TYPE";
    description
    "END with PSP & USP.";
  }

  identity SRV6_END_T_FUNC_NO_PSP_USP {
    base "SRV6_END_FUNC_TYPE";
    description
    "End.T (no PSP, no USP).";
  }

  identity SRV6_END_T_FUNC_PSP {
    base "SRV6_END_FUNC_TYPE";
    description
    "End.T with PSP.";
  }

  identity SRV6_END_T_FUNC_USP {
    base "SRV6_END_FUNC_TYPE";
    description
    "End.T with USP.";
  }

  identity SRV6_END_T_FUNC_PSP_USP {
    base "SRV6_END_FUNC_TYPE";
    description
    "End.T with PSP & USP.";
  }

  identity SRV6_END_X_FUNC_NO_PSP_USP {
    base "SRV6_END_FUNC_TYPE";
    description
    "End.x (no PSP, no USP).";
  }




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  identity SRV6_END_X_FUNC_PSP {
    base "SRV6_END_FUNC_TYPE";
    description
    "End.x with PSP.";
  }

  identity SRV6_END_X_FUNC_USP {
    base "SRV6_END_FUNC_TYPE";
    description
    "End.x with USP.";
  }

  identity SRV6_END_X_FUNC_PSP_USP {
    base "SRV6_END_FUNC_TYPE";
    description
    "End.x with PSP & USP.";
  }

  identity SRV6_END_FUNC_DX6 {
    base "SRV6_END_FUNC_TYPE";
    description
    "End.DX6 function.";
  }

  identity SRV6_END_FUNC_DT6 {
    base "SRV6_END_FUNC_TYPE";
    description
    "End.DT6 function.";
  }

  identity SRV6_END_FUNC_OTP {
    base "SRV6_END_FUNC_TYPE";
    description
    "END.OTP .";
  }

  /* typedef */
  typedef srv6-sid-value {
    type inet:ipv6-address-no-zone;
    description
      "16 Octets encoded sid value.";
  }

  /* Features */
  feature srv6-ti-lfa {
    description
     "Enhance SRv6 FRR with ti-lfa
     support";



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  }

  /* Groupings */
  grouping srv6-msd {
    description
      "means to advertise to advertise node/link specific values for
       Maxium Sid Depths(MSD) of various types";
    container v6-max-value-srh {
      description
      "Maximum SRv6 SID Depths.";
      leaf max-segments-left {
        type uint8;
        description
        "The maximum value of 'SL' field in the SRH of a received packet.";
      }
      leaf max-end-pop {
        type uint8;
        description
        "The maximum number of SIDS in the top SRH in an SRH stack to which
         the router can apply 'PSP' or 'USP'.";
      }
      leaf max-t-insert {
        type uint8;
        description
        "The maximum number of SIDs can be inserted as port of the 'T.insert'
         behavior.";
      }
      leaf max-t-encap {
        type uint8;
        description
        "The maximum number of SIDs can be included as part of the 'T.Encap'
         behavior.";
      }
      leaf max-end-d {
        type uint8;
        description
          "The maximum number of SIDs in an SRH when performing decapsulation
            associated with 'End.Dx' functions (e.g., 'End.DX6' and 'End.DT6').";
      }
    }
  }

  grouping srv6-capabilities {
    description
    "SRV6 capability grouping.";
    container srv6-capability {
      description
        "SRv6 capability.";



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      leaf flags {
        type bits {
          bit e-flag {
            position 0;
            description
            "If set, then router is able to
             apply T.Encap operation as specified in
             [filsfils-spring-srv6-network-programming].";
          }
          bit o-flag {
            position 1;
            description
            "If set, then the router is able to
             use of the O-bit in the Segment Routing Header(SRH)
             as defined in [draft-ietf-6man-segment-routing-header].";
          }
        }
        description
        "Flags.";
      }

      container srv6-msd-value {
        description
        "Maximum SRv6 SID Depths.";
        leaf max-segments-left {
          type uint8;
          description
          "The maximum value of 'SL' field in the SRH of a received packet.";
        }
        leaf max-end-pop {
          type uint8;
          description
          "The maximum number of SIDS in the top SRH in an SRH stack to which
           the router can apply 'PSP' or 'USP'.";
        }
        leaf max-t-insert {
          type uint8;
          description
          "The maximum number of SIDs can be inserted as port of the 'T.insert'
           behavior.";
        }
        leaf max-t-encap {
          type uint8;
          description
          "The maximum number of SIDs can be included as part of the 'T.Encap'
           behavior.";
        }
        leaf max-end-d {



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          type uint8;
          description
            "The maximum number of SIDs in an SRH when performing decapsulation
              associated with 'End.Dx' functions (e.g., 'End.DX6' and 'End.DT6').";
        }
      }
    }
  }

  grouping srv6-endpoint-func {
     description
      "This group defines srv6 endpoint function";
    container endpoint-func {
      description
        "Srv6 Endpoint function Descriptor.";
      leaf fuc-flags {
        type uint8;
        description
          "No function flags are currently being defined.";
      }
      leaf endpoint-func {
        type identityref {
         base ospf-srv6:SRV6_END_FUNC_TYPE;
        }
        description
          "The endpoint function.";
      }
      leaf undefined-endpoint-func {
        type uint16;
        description
          "Unknown endpoint func value.";
      }
    }
  }

  grouping srv6-end-sid {
    description
    "SRv6 Segment Identifier(SID) with Endpoint functions.";
    leaf flags {
      type uint8;
      description
        "NO flags are currently being defined.";
    }

    uses srv6-endpoint-func;

    leaf sid {
      type srv6-sid-value;



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      description
        "SRV6 sid value.";
    }
    // sub-sub-tlvs not yet defined
  }

  grouping srv6-node-sid {
    description
      "This group defines srv6 node sid tlv.";
    uses srv6-endpoint-func;

    leaf sid-flags {
      type uint8;
      description
        "NO sid flags are currently being defined.";
    }

    leaf sid-size {
      type uint8;
      description
        "Number of bits in the SID field";
    }

    leaf sid {
      type srv6-sid-value;
      description
        "SRV6 sid value.";
    }

    leaf neighbor-router-id {
       type yang:dotted-quad;
       description
         "Neighbor router ID.This is only
          used on LAN adjacencies.";
    }

    // sub-tlvs
  }

  grouping srv6-endx-sid {
    description
    "SRv6 sid associated with an adjacency.";

    uses srv6-endpoint-func;

    leaf sid-flags {
      type uint8;
      description



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        "NO sid flags are currently being defined.";
    }

    leaf sid-size {
      type uint8;
      description
        "Number of bits in the SID field";
    }

    leaf sid {
      type srv6-sid-value;
      description
        "SRV6 sid value.";
    }

    leaf neighbor-router-id {
       type yang:dotted-quad;
       description
         "Neighbor router ID.This is only
          used on LAN adjacencies.";
    }

    // sub-tlvs
  }

  /* Cfg */
  augment "/rt:routing/" +
          "rt:control-plane-protocols/rt:control-plane-protocol"+
          "/ospf:ospf" {
    when "/rt:routing/rt:control-plane-protocols/"+
         "rt:control-plane-protocol/rt:type = 'ospf:ospfv3'" {
      description
        "This augment OSPF routing protocol when used";
    }
    description
      "This augments OSPF protocol configuration
       with SRv6.";


    container srv6-cfg{
      leaf enable{
        type boolean;
        default "false";
        description
          "Enables SRv6
           protocol extensions.";
      }




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      leaf persistent-end-x-sid{
        type boolean;
        default "false";
        description
          "Enable the persistent nature of End.X sid";
      }
      description
        "Configuration about OSPF segment-routing IPv6.";
    }
  }

  augment "/rt:routing/" +
          "rt:control-plane-protocols/rt:control-plane-protocol"+
          "/ospf:ospf/ospf:areas/ospf:area/ospf:interfaces/ospf:interface"+
          "/ospf:fast-reroute"{
    when "/rt:routing/rt:control-plane-protocols/"+
         "rt:control-plane-protocol/rt:type = 'ospf:ospfv3'"{
      description
        "This augment OSPF routing protocol when used";
    }
    description
      "This augments OSPF IPFRR with IPV6 TILFA.";

    container srv6-ti-lfa {

      if-feature srv6-ti-lfa;
      leaf enable {
        type boolean;
        description
          "Enables SRv6 TI-LFA computation.";
      }


      description
        "SRv6 TILFA configuration.";
    }
  }

  /* Database */
  augment "/rt:routing/"
           + "rt:control-plane-protocols/rt:control-plane-protocol/"
           + "ospf:ospf/ospf:areas/ospf:area/"
           + "ospf:database/"
           + "ospf:area-scope-lsa-type/ospf:area-scope-lsas/"
           + "ospf:area-scope-lsa/ospf:version/ospf:ospfv3/"
           + "ospf:ospfv3/ospf:body/ospf:router-information" {
    when "/rt:routing/rt:control-plane-protocols/"+
         "rt:control-plane-protocol/rt:type = 'ospf:ospfv3'" {



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      description
        "This augment OSPFv3 routing protocol when used";
    }
    description
     "This augments OSPFv3 protocol router capability.";
      uses srv6-capabilities;
  }

  augment "/rt:routing/"
           + "rt:control-plane-protocols/rt:control-plane-protocol/"
           + "ospf:ospf/ospf:areas/ospf:area/"
           + "ospf:database/"
           + "ospf:area-scope-lsa-type/ospf:area-scope-lsas/"
           + "ospf:area-scope-lsa/ospf:version/ospf:ospfv3/"
           + "ospf:ospfv3/ospf:body/ospfv3-e-lsa:e-router/"
           + "ospfv3-e-lsa:e-router-tlvs/ospfv3-e-lsa:link-tlv/"
           + "ospfv3-e-lsa:sub-tlvs" {
    when "/rt:routing/rt:control-plane-protocols/"+
         "rt:control-plane-protocol/rt:type = 'ospf:ospfv3'" {
    }
    description
     "This augments OSPFv3 protocol neighbor.";
    container srv6-endx-sids-sub-tlv {
      description
        "This defines svr6 end-x sids for the adjacency.";
      list endx-sid {
        key "sid";
        uses srv6-endx-sid;
        description
           "List of end-x sids.";
      }
    }
  }

  augment "/rt:routing/"
           + "rt:control-plane-protocols/rt:control-plane-protocol/"
           + "ospf:ospf/ospf:areas/ospf:area/"
           + "ospf:database/"
           + "ospf:area-scope-lsa-type/ospf:area-scope-lsas/"
           + "ospf:area-scope-lsa/ospf:version/ospf:ospfv3/"
           + "ospf:ospfv3/ospf:body/ospf:router-information" {
    when "/rt:routing/rt:control-plane-protocols/"+
         "rt:control-plane-protocol/rt:type = 'ospf:ospfv3'" {
      description
      "This augment OSPFv3 routing protocol when used.";
    }
    description
     "This augment OSPFv3 routing protocol when used";



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    container srv6-node-sids {
      description
         "This defines srv6 node sid tlvs.";
      list srv6-node-sids {
        key "sid";
        uses srv6-node-sid;
        description
          "List of srv6 node sids.";
      }
    }
  }
  /* Notifications */
}
<CODE ENDS>

5.  Security Considerations

   Configuration and state data defined in this document are designed to
   be accessed via the NETCONF protocol [RFC6241].

   As OSPF is an IGP protocol (critical piece of the network), ensuring
   stability and security of the protocol is mandatory for the network
   service.

   Authors recommends to implement NETCONF access control model
   ([RFC6536]) to restrict access to all or part of the configuration to
   specific users.

6.  Contributors

   TBD.

7.  Acknowledgements

   TBD.

8.  IANA Considerations

   The IANA is requested to assign two new URIs from the IETF XML
   registry ([RFC3688]).  Authors are suggesting the following URI:

               URI: urn:ietf:params:xml:ns:yang:ietf-ospf-srv6
               Registrant Contact: The IESG.
               XML: N/A, the requested URI is an XML namespace

   This document also requests one new YANG module name in the YANG
   Module Names registry ([RFC6020]) with the following suggestion :




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  name: ietf-isis-srv6
  namespace: urn:ietf:params:xml:ns:yang:ietf-ospf-srv6 prefix: ospf-srv6
  reference: RFC XXXX

9.  References

   [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-17 (work in progress), September 2018.

   [I-D.li-ospf-ospfv3-srv6-extensions]
              Li, Z., Hu, Z., Cheng, D., Talaulikar, K., and P. Psenak,
              "OSPFv3 Extensions for SRv6", draft-li-ospf-
              ospfv3-srv6-extensions-02 (work in progress), September
              2018.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

   [RFC3688]  Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
              DOI 10.17487/RFC3688, January 2004,
              <https://www.rfc-editor.org/info/rfc3688>.

   [RFC6020]  Bjorklund, M., Ed., "YANG - A Data Modeling Language for
              the Network Configuration Protocol (NETCONF)", RFC 6020,
              DOI 10.17487/RFC6020, October 2010,
              <https://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,
              <https://www.rfc-editor.org/info/rfc6241>.

   [RFC6536]  Bierman, A. and M. Bjorklund, "Network Configuration
              Protocol (NETCONF) Access Control Model", RFC 6536,
              DOI 10.17487/RFC6536, March 2012,
              <https://www.rfc-editor.org/info/rfc6536>.

   [RFC7950]  Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language",
              RFC 7950, DOI 10.17487/RFC7950, August 2016,
              <https://www.rfc-editor.org/info/rfc7950>.







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Internet-Draft        YANG Data Model for OSPF SRv6         October 2018


Authors' Addresses

   Zhibo Hu
   Huawei Technologies
   Huawei Bld., No.156 Beiqing Rd.
   Beijing  100095
   China

   Email: huzhibo@huawei.com


   Kamran Raza
   Cisco Systems, Inc.
   2000 Innovation Drive
   Kanata, ON  K2K-3E8
   CA

   Email: skraza@cisco.com


   Yingzhen Qu
   Huawei Technologies
   Huawei Bld., No.156 Beiqing Rd.
   Beijing  100095
   China

   Email: yingzhen.qu@huawei.com


   Jiajia Dong
   Huawei Technologies
   Huawei Bld., No.156 Beiqing Rd.
   Beijing  100095
   China

   Email: dongjiajia@huawei.com















Hu, et al.               Expires April 25, 2019                [Page 17]


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