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Versions: 00 01 02 03 04 05 06 draft-ietf-idr-bgpls-srv6-ext

Inter-Domain Routing
Internet-Draft
Intended status: Standards Track                           G. Dawra, Ed.
Expires: August 22, 2018                                        LinkedIn
                                                             C. Filsfils
                                                      K. Talaulikar, Ed.
                                                           Cisco Systems
                                                                 M. Chen
                                                                  Huawei
                                                              D. Bernier
                                                             Bell Canada
                                                               J. Uttaro
                                                                    AT&T
                                                             B. Decraene
                                                                  Orange
                                                              H. Elmalky
                                                                Ericsson
                                                       February 18, 2018


        BGP Link State extensions for IPv6 Segment Routing(SRv6)
                   draft-dawra-idr-bgpls-srv6-ext-02

Abstract

   Segment Routing IPv6(SRv6) allows for a flexible definition of end-
   to-end paths within various topologies by encoding paths as sequences
   of topological sub-paths, called "segments".  These segments are
   advertised by the various protocols such as (BGP, IGP, BGP-LS etc).

   BGP Link-state(BGP-LS) address-family solution for SRv6 is consistent
   with BGP-LS for SR-MPLS [I-D.ietf-idr-bgp-ls-segment-routing-ext].
   This draft defines extensions to the BGP-LS to carry SR/SRv6
   Segments, Services and function information via BGP.

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




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   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on August 22, 2018.

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
   (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.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  BGP-LS extensions for SRv6  . . . . . . . . . . . . . . . . .   3
     2.1.  SRv6 Node Attributes  . . . . . . . . . . . . . . . . . .   3
       2.1.1.  SRv6 Capability Attribute TLV . . . . . . . . . . . .   4
       2.1.2.  SRv6 SID TLV  . . . . . . . . . . . . . . . . . . . .   7
     2.2.  SRv6 Link Attributes  . . . . . . . . . . . . . . . . . .   8
       2.2.1.  SRv6 P2P X-SID TLV  . . . . . . . . . . . . . . . . .   9
       2.2.2.  SRv6 LAN X-SID TLV  . . . . . . . . . . . . . . . . .  10
     2.3.  Function Sub-TLV  . . . . . . . . . . . . . . . . . . . .  10
   3.  Function Mapping Summary  . . . . . . . . . . . . . . . . . .  11
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
     4.1.  TLV/Sub-TLV Code Points Summary . . . . . . . . . . . . .  12
     4.2.  Segment routing function Identifier(SFI)  . . . . . . . .  13
   5.  Manageability Considerations  . . . . . . . . . . . . . . . .  13
   6.  Operational Considerations  . . . . . . . . . . . . . . . . .  13
     6.1.  Operations  . . . . . . . . . . . . . . . . . . . . . . .  13
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   8.  Conclusions . . . . . . . . . . . . . . . . . . . . . . . . .  14
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  14
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  16
   Appendix A.  Contributors . . . . . . . . . . . . . . . . . . . .  17
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  17






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1.  Introduction

   SRv6 refers to Segment Routing instantiated on the IPv6 dataplane
   [I-D.ietf-spring-segment-routing].

   The network programming paradigm
   [I-D.filsfils-spring-srv6-network-programming] is central to SRv6.
   It describes how any function can be bound to a SID and how any
   network program can be expressed as a combination of SID's.

   "SID" (abbreviation for Segment Identifier) is often used as a
   shorter reference for "SRv6 Segment".  An SRv6-capable node N
   maintains a "My Local SID Table".  This table contains all the local
   segments explicitly instantiated at node N.

   The IGP link-state routing protocols have been extended to advertise
   some of these SIDs and other SR-related information.  IGP extensions
   are described in [I-D.bashandy-isis-srv6-extensions].

   Applications that require topological visibility, syncing the "My
   Local SID Table" within a domain area, or even across Autonomous
   Systems (AS), is required.

   The identifying key of each Link-State object, namely a node, link,
   or prefix, is encoded in the NLRI and the properties of the object
   are encoded in the BGP-LS attribute [RFC7752].

   This document describes extensions to BGP-LS attribute to advertise
   the SR/SRv6 "My Local SID Table" and some other related SR-
   information.  Some of the information advertised in BGP-LS may not be
   advertised by IGP/BGP Protocol.

2.  BGP-LS extensions for SRv6

   BGP-LS[RFC7752] defines the BGP Node and Link attributes.  All non-
   VPN link, node, and prefix information SHALL be encoded using AFI
   16388 / SAFI 71.  VPN link, node, and prefix information SHALL be
   encoded using AFI 16388 / SAFI 72.

   This document defines BGP/IGP SR extensions to BGP-LS Node attribute
   TLVs in Section 2.1 and Link attribute TLVs in Section 2.2.

2.1.  SRv6 Node Attributes

   Node Attribute TLVs are used for the node level SRv6 capabilities and
   for SRv6 SIDs with their node level functions (e.g.  END, END.T,
   Service function) that are signaled by the originating router for SR
   operations.



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   The following Node Attribute TLVs are defined:

   +--------------+----------------------------+-------------+----------------+
   |  TLV Code    | Description                |   Length    | Section        |
   |   Point      |                            |             |                |
   +--------------+----------------------------+-------------+----------------+
   |    TBD       |   SRv6 Capabilities TLV    | variable    | Section 2.1.1  |
   |              |                            |             |                |
   |    TBD       |   SRv6 SID TLV             | variable    | Section 2.1.2  |
   |              |                            |             |                |
   +--------------+----------------------------+-------------+----------------+

   These TLVs can ONLY be added to the Node Attribute associated with
   the local node that is originating the corresponding IGP/BGP TLV.

2.1.1.  SRv6 Capability Attribute TLV

   This TLV is used to announce the SRv6 capability of the router and to
   indicate the nature of its support for the SRH operations.

        0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |               Type            |          Length               |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |             Flags             |    Sub-TLVs...|
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Where:

   o  Type: 16 bit field.  TBD

   o  Length: 16 bit field.  Length of Capability TLV + length of Sub-
      TLVs

   o  Flags: 16 bit field.  The following flags are defined:

             0                   1
             0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
            +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
            |E|O|                           |
            +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

      where:

      *  E-flag: If set, then router is able to apply "T.Encap"
         operation




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      *  O-flag: If set, then router is capable of supporting SRH O-bit
         Flags, as specified in [I-D.ietf-6man-segment-routing-header].

   The following sections define the supported sub-TLVs.

2.1.1.1.  Maximum SL sub-TLV

   The Maximum Segments Left sub-TLV specifies the maximum value of the
   "SL" field [SRH] in the SRH of a received packet before applying the
   function associated with a SID.

         +---------------------------------------+
         |          Type (2 octet)               |
         +---------------------------------------+
         |          Length (2 octet)             |
         +---------------------------------------+
         |          Max SL (2 octet)             |
         +---------------------------------------+

   o  Type:1

   o  Length: 2

   o  SL Value: 2 octet

   o  An 16 bit unsigned integer.

   If the sub-TLV is NOT advertised the value is assumed to be 0.

2.1.1.2.  Maximum End Pop SRH sub-TLV

   The Maximum End Pop SRH sub-TLV specifies the maximum number of SIDs
   in the top SRH in an SRH stack to which the router can apply "PSP" or
   USP" [NP] flavors.

         +---------------------------------------+
         |          Type (2 octet)               |
         +---------------------------------------+
         |          Length (2 octet)             |
         +---------------------------------------+
         |          Max-End-Pop-SRH (2 octet)    |
         +---------------------------------------+

   o  Type: 2

   o  Length: 2

   o  Max-End-Pop-SRH Value: 2 octet



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   o  An 16 bit unsigned integer.

   If the value is zero or the sub-sub-TLV is NOT advertised, then it is
   assumed that the router cannot apply PSP or USP flavors.

2.1.1.3.  Maximum T.Insert SRH sub-TLV

   The Maximum T.Insert SRH sub-sub-TLV specifies the maximum number of
   SIDs that can be inserted as part of the "T.insert" behavior [NP].

         +---------------------------------------+
         |          Type (2 octet)               |
         +---------------------------------------+
         |          Length (2 octet)             |
         +---------------------------------------+
         |          Max-T.Insert (2 octet)       |
         +---------------------------------------+

   o  Type: 3

   o  Length: 2

   o  Max-T.Insert Value: 2 octet

   o  An 16 bit unsigned integer.

   If the value is zero or the sub-sub-TLV is omitted, then the router
   is assumed not to support any variation of the "T.insert" behavior.

2.1.1.4.  Maximum T.Encap SRH sub-TLV

   The Maximum T.Encap SRH sub-sub-TLV specifies the maximum number of
   SIDs that can be included as part of the "T.Encap" behavior [NP].

         +---------------------------------------+
         |          Type (2 octet)               |
         +---------------------------------------+
         |          Length (2 octet)             |
         +---------------------------------------+
         |          Max-T.Encap (2 octet)        |
         +---------------------------------------+

   o  Type: 4

   o  Length: 2

   o  Max-T.Encap Value: 2 octet




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   o  An 16 bit unsigned integer.

   If this value is zero or the sub-TLV is omitted and the "E" flag is
   set in the associated SRv6 Capabilities sub-TLV, then it is assumed
   that the router can apply T.Encap by encapsulating the incoming
   packet in another IPv6 header without SRH the same way IPinIP
   encapsulation is performed.  If the "E" flag is clear, then this sub-
   sub-TLV SHOULD NOT be transmitted and MUST be ignored on receipt.

2.1.1.5.  Maximum End D SRH sub-TLV

   The Maximum End D SRH sub-sub-TLV specifies the maximum number of
   SIDs in an SRH when applying "End.DX6" and "End.DT6" functions.

         +---------------------------------------+
         |          Type (2 octet)               |
         +---------------------------------------+
         |          Length (2 octet)             |
         +---------------------------------------+
         |          Max End D (2 octet)          |
         +---------------------------------------+

   o  Type: 5

   o  Length: 2

   o  Max End D Value: 2 octet

   o  An 16 bit unsigned integer.

   If this value is zero or the sub-TLV is omitted, then it is assumed
   that the router cannot apply "End.DX6" or "End.DT6" functions if the
   extension header right underneath the outer IPv6 header is an SRH.

   Function Sub-TLV described in Section 2.3 is used to encode Function
   Identifier and Function Flags.

2.1.2.  SRv6 SID TLV

   This TLV is used for the Segment Routing SID(SRv6) and associate with
   their node level functions (e.g.  END, END.T, Service functions etc)
   that are signaled by the originating router.  Function Sub-TLV
   described in Section 2.3 is used to encode Function Identifier and
   Function Flags.







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         +---------------------------------------+
         |          Type (2 octet)               |
         +---------------------------------------+
         |          Length (2 octet)             |
         +---------------------------------------+
         |          Flags (1 octet)              |
         +---------------------------------------+
         |      SID value (16 octet)             |
         +---------------------------------------+

                   Figure 1: Segment Identifier(SID) TLV

   Where:

      Type: 16 bit field.  TBD

      Length: 16 bit field.  The total length of the value portion of
      the TLV.

      Flags: 8 bit field.  Future.

      Rest Flags SHOULD be set to zero on transmission and MUST be
      ignored on receipt.

      SID Value: 16 octet IPv6 address.

2.2.  SRv6 Link Attributes

   These TLVs are used for the SRv6 SIDs with their link or adjacency
   level functions (e.g.  END.X function) that are signaled by the
   originating router for SRv6 operations.  One or more of these link
   attribute TLVs may be attached to the BGP-LS update.

   The following Link Attribute TLVs are defined:

   +-----------+----------------------------+----------+---------------+
   |  TLV Code | Description                |   Length |       Section |
   |   Point   |                            |          |               |
   +-----------+----------------------------+----------+---------------+
   |    TBD    | SRv6 P2P X-SID TLV         | variable | Section 2.2.1 |
   |           |                            |          |               |
   |    TBD    | SRv6 LAN X-SID TLV         | variable | Section 2.2.2 |
   |           |                            |          |               |
   +-----------+----------------------------+----------+---------------+

   These TLVs can ONLY be added to the Link Attribute associated with
   the link whose local node originates the corresponding TLV.




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   For a LAN, normally a node only announces its adjacency to the IS-IS
   pseudo-node (or the equivalent OSPF Designated and Backup Designated
   Routers).  The SRv6 SID LAN Adjacency Attribute TLV allows a node to
   announce adjacencies to all other nodes attached to the LAN in a
   single instance of the BGP-LS Link NLRI.  Without this TLV, the
   corresponding BGP-LS link NLRI would need to be originated for each
   additional adjacency in order to advertise the SRv6 SID TLVs for
   these neighbor adjacencies.

2.2.1.  SRv6 P2P X-SID TLV

   The SRv6 SID Adjacency TLV has the following format:

         +---------------------------------------+
         |          Type (2 octet)               |
         +---------------------------------------+
         |          Length (2 octet)             |
         +---------------------------------------+
         |        SID-Flags(1 octet)             |
         +---------------------------------------+
         |        SID-Size(1 octet)              |
         +---------------------------------------+
         |     SID value (1-16 octet)            |
         +---------------------------------------+

   Where:

      Type is TBD

      Length: 16 bit field.  The total length of the value portion of
      the TLV.

      SID-Flags: For IGP as defined in
      [I-D.bashandy-isis-srv6-extensions]

      SID-size: Number of bits in the SID field.

      SID: 1-16 octets.  This field encodes the advertised SRv6 SID.
      The "SID-size" field can have the values 1-128 and indicates the
      number of bits in the SID.  The SRv6 SID is encoded in the minimal
      number of octets for the given number of bits.

   Function Sub-TLV described in Section 2.3 is used to encode Function
   Identifier and Function Flags.







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2.2.2.  SRv6 LAN X-SID TLV

   The SRv6 SID LAN Adjacency TLV has the following format:

         +---------------------------------------+
         |          Type (2 octet)               |
         +---------------------------------------+
         |          Length (2 octet)             |
         +---------------------------------------+
         |  OSPF Nbr ID/ISIS System ID(6 Octet)  |
         +---------------------------------------+
         |        SID-Flags(1 octet)             |
         +---------------------------------------+
         |        SID-Size(1 octet)              |
         +---------------------------------------+
         |     SID value (1-16 octet)            |
         +---------------------------------------+

   o  Type: TBD

   o  Length: 16 bit value.  Variable

   o  SID-Flags: For IGP as defined in
      [I-D.bashandy-isis-srv6-extensions]

   o  SID-size: Number of bits in the SID field.

   o  SID: 1-16 octets.  This field encodes the advertised SRv6 SID.
      The "SID-size" field can have the values 1-128 and indicates the
      number of bits in the SID.  The SRv6 SID is encoded in the minimal
      number of octets for the given number of bits.

   o  Neighbor : 4 octets for OSPFv2/v3 neighbor ID or 6 octets for IS-
      IS system-id of the neighbor

   Function Sub-TLV described in Section 2.3 is used to encode Function
   Identifier and Function Flags.

2.3.  Function Sub-TLV












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         +---------------------------------------+
         |          Type (2 octet)               |
         +---------------------------------------+
         |          Length (2 octet)             |
         +---------------------------------------+
         |       Function Flags(1 octet)         |
         +---------------------------------------+
         |       RESERVED(1 octet)               |
         +---------------------------------------+
         |       Function ID (2 octet)           |
         +---------------------------------------+

                        Figure 2: Function Sub-TLV

   Where:

      Type: 16 bit field: TBD

      Length: 16 bit field.  Length of the TLV

      Function Flags: 8 bit field.  For IGP as defined in
      [I-D.bashandy-isis-srv6-extensions]

      RESERVED: 8 bit field.  SHOULD be unset on transmission and MUST
      be ignored on receipt.

      Function ID: 16 bit field.  Function Identifier of the SID Encoded
      in the TLV.  New function Top Level registry is defined in
      Section Section 4.2.

3.  Function Mapping Summary

   Below table illustrate the summary of functions and Node or Link
   Level TLV encodings.  Table will encode Functions for both SR-MPLS/
   SRv6 for both Layer-2 and Layer-3 functions with unique values.
   Table will also include encoding Attribute TLV for functions.
   Segment Routing functions are defined
   in[I-D.filsfils-spring-srv6-network-programming]













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+--------------+---------------------------+---------------------------------+
|  Function    |      Function Identifier  |        Encoding Attribute TLV   |
|              |                           |                                 |
+--------------+---------------------------+---------------------------------+
|  END         |      1                    |        Node SID                 |
+--------------+---------------------------+---------------------------------+
|  END.X       |      2                    |        Link LAN X-SID           |
|              |                           |        Link P2P X-SID           |
+--------------+---------------------------+---------------------------------+
|  END.T       |      3                    |        Node SID                 |
+--------------+---------------------------+---------------------------------+
|  END.DX6     |      4                    |        Link LAN X-SID           |
|              |                           |        Link P2P X-SID           |
+--------------+---------------------------+---------------------------------+
|  END.DX4     |      5                    |        Link P2P X-SID           |
+--------------+---------------------------+---------------------------------+
|  END.DT6     |      6                    |        Node SID                 |
+--------------+---------------------------+---------------------------------+
|  END.DT4     |      7                    |        Node SID                 |
+--------------+---------------------------+---------------------------------+



4.  IANA Considerations

   This document requests assigning code-points from the registry "BGP-
   LS Node Descriptor, Link Descriptor, Prefix Descriptor, and Attribute
   TLVs".

4.1.  TLV/Sub-TLV Code Points Summary

   This section contains the global table of all TLVs defined in this
   document.

      +--------------+----------------------------+----------------+
      |  TLV Code    | Description                | Section        |
      |   Point      |                            |                |
      +--------------+----------------------------+----------------+
      |    TBD       |   SRv6 Capabilities TLV    | Section 2.1.1  |
      |              |                            |                |
      |    TBD       |   SRv6 SID TLV             | Section 2.1.2  |
      |              |                            |                |
      |    TBD       |   SRv6 P2P X-SID TLV       | Section 2.2.1  |
      |              |                            |                |
      |    TBD       |   SRv6 LAN X-SID TLV       | Section 2.2.2  |
      |              |                            |                |
      |    TBD       |   Function  TLV            | Section 2.3    |
      +--------------+----------------------------+----------------+



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4.2.  Segment routing function Identifier(SFI)

   IANA is request to create a new top-level registry called "Segment
   Routing Function Identifier(SFI)".  Valid values are in the range 0
   to 65535.  Values 0 and 65535 are to be marked "Reserved, not to be
   allocated".

   ---------------+---------------------------+
   |  Function    |      Function Identifier  |
   |              |                           |
   ---------------+---------------------------+
   |  END         |           1               |
   ---------------+---------------------------+
   |  END.X       |           2               |
   ---------------+---------------------------+
   |  END.T       |           3               |
   ---------------+---------------------------+
   |  END.DX6     |           4               |
   ---------------+---------------------------+
   |  END.DX4     |           5               |
   ---------------+---------------------------+
   |  END.DT6     |           6               |
   ---------------+---------------------------+
   |  END.DT4     |           7               |
   ---------------+---------------------------+

5.  Manageability Considerations

   This section is structured as recommended in[RFC5706]

6.  Operational Considerations

6.1.  Operations

   Existing BGP and BGP-LS operational procedures apply.  No additional
   operation procedures are defined in this document.

7.  Security Considerations

   Procedures and protocol extensions defined in this document do not
   affect the BGP security model.  See the 'Security Considerations'
   section of [RFC4271]for a discussion of BGP security.  Also refer
   to[RFC4272]and[RFC6952]for analysis of security issues for BGP.








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8.  Conclusions

   This document proposes extensions to the BGP to allow advertising
   certain attributes and functionalities related to SRv6.

9.  References

9.1.  Normative References

   [I-D.bashandy-isis-srv6-extensions]
              Ginsberg, L., Bashandy, A., Filsfils, C., and B. Decraene,
              "IS-IS Extensions to Support Routing over IPv6 Dataplane",
              draft-bashandy-isis-srv6-extensions-01 (work in progress),
              September 2017.

   [I-D.filsfils-spring-segment-routing-policy]
              Filsfils, C., Sivabalan, S., Raza, K., Liste, J., Clad,
              F., Talaulikar, K., Hegde, S., daniel.voyer@bell.ca, d.,
              Lin, S., bogdanov@google.com, b., Horneffer, M.,
              Steinberg, D., Decraene, B., Litkowski, S., and P. Mattes,
              "Segment Routing Policy for Traffic Engineering", draft-
              filsfils-spring-segment-routing-policy-04 (work in
              progress), December 2017.

   [I-D.filsfils-spring-srv6-network-programming]
              Filsfils, C., Leddy, J., daniel.voyer@bell.ca, d.,
              daniel.bernier@bell.ca, d., Steinberg, D., Raszuk, R.,
              Matsushima, S., Lebrun, D., Decraene, B., Peirens, B.,
              Salsano, S., Naik, G., Elmalky, H., Jonnalagadda, P.,
              Sharif, M., Ayyangar, A., Mynam, S., Henderickx, W.,
              Bashandy, A., Raza, K., Dukes, D., Clad, F., and P.
              Camarillo, "SRv6 Network Programming", draft-filsfils-
              spring-srv6-network-programming-03 (work in progress),
              December 2017.

   [I-D.ietf-6man-segment-routing-header]
              Previdi, S., Filsfils, C., Raza, K., Dukes, D., Leddy, J.,
              Field, B., daniel.voyer@bell.ca, d.,
              daniel.bernier@bell.ca, d., Matsushima, S., Leung, I.,
              Linkova, J., Aries, E., Kosugi, T., Vyncke, E., Lebrun,
              D., Steinberg, D., and R. Raszuk, "IPv6 Segment Routing
              Header (SRH)", draft-ietf-6man-segment-routing-header-08
              (work in progress), January 2018.

   [RFC2460]  Deering, S. and R. Hinden, "Internet Protocol, Version 6
              (IPv6) Specification", RFC 2460, DOI 10.17487/RFC2460,
              December 1998, <https://www.rfc-editor.org/info/rfc2460>.




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   [RFC3107]  Rekhter, Y. and E. Rosen, "Carrying Label Information in
              BGP-4", RFC 3107, DOI 10.17487/RFC3107, May 2001,
              <https://www.rfc-editor.org/info/rfc3107>.

   [RFC4272]  Murphy, S., "BGP Security Vulnerabilities Analysis",
              RFC 4272, DOI 10.17487/RFC4272, January 2006,
              <https://www.rfc-editor.org/info/rfc4272>.

   [RFC4364]  Rosen, E. and Y. Rekhter, "BGP/MPLS IP Virtual Private
              Networks (VPNs)", RFC 4364, DOI 10.17487/RFC4364, February
              2006, <https://www.rfc-editor.org/info/rfc4364>.

   [RFC4456]  Bates, T., Chen, E., and R. Chandra, "BGP Route
              Reflection: An Alternative to Full Mesh Internal BGP
              (IBGP)", RFC 4456, DOI 10.17487/RFC4456, April 2006,
              <https://www.rfc-editor.org/info/rfc4456>.

   [RFC5706]  Harrington, D., "Guidelines for Considering Operations and
              Management of New Protocols and Protocol Extensions",
              RFC 5706, DOI 10.17487/RFC5706, November 2009,
              <https://www.rfc-editor.org/info/rfc5706>.

   [RFC6514]  Aggarwal, R., Rosen, E., Morin, T., and Y. Rekhter, "BGP
              Encodings and Procedures for Multicast in MPLS/BGP IP
              VPNs", RFC 6514, DOI 10.17487/RFC6514, February 2012,
              <https://www.rfc-editor.org/info/rfc6514>.

   [RFC6952]  Jethanandani, M., Patel, K., and L. Zheng, "Analysis of
              BGP, LDP, PCEP, and MSDP Issues According to the Keying
              and Authentication for Routing Protocols (KARP) Design
              Guide", RFC 6952, DOI 10.17487/RFC6952, May 2013,
              <https://www.rfc-editor.org/info/rfc6952>.

   [RFC7432]  Sajassi, A., Ed., Aggarwal, R., Bitar, N., Isaac, A.,
              Uttaro, J., Drake, J., and W. Henderickx, "BGP MPLS-Based
              Ethernet VPN", RFC 7432, DOI 10.17487/RFC7432, February
              2015, <https://www.rfc-editor.org/info/rfc7432>.

   [RFC7606]  Chen, E., Ed., Scudder, J., Ed., Mohapatra, P., and K.
              Patel, "Revised Error Handling for BGP UPDATE Messages",
              RFC 7606, DOI 10.17487/RFC7606, August 2015,
              <https://www.rfc-editor.org/info/rfc7606>.

   [RFC7752]  Gredler, H., Ed., Medved, J., Previdi, S., Farrel, A., and
              S. Ray, "North-Bound Distribution of Link-State and
              Traffic Engineering (TE) Information Using BGP", RFC 7752,
              DOI 10.17487/RFC7752, March 2016,
              <https://www.rfc-editor.org/info/rfc7752>.



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9.2.  Informative References

   [I-D.ietf-bess-evpn-prefix-advertisement]
              Rabadan, J., Henderickx, W., Drake, J., Lin, W., and A.
              Sajassi, "IP Prefix Advertisement in EVPN", draft-ietf-
              bess-evpn-prefix-advertisement-09 (work in progress),
              November 2017.

   [I-D.ietf-idr-bgp-ls-segment-routing-ext]
              Previdi, S., Talaulikar, K., Filsfils, C., Gredler, H.,
              and M. Chen, "BGP Link-State extensions for Segment
              Routing", draft-ietf-idr-bgp-ls-segment-routing-ext-04
              (work in progress), January 2018.

   [I-D.ietf-idr-bgp-prefix-sid]
              Previdi, S., Filsfils, C., Lindem, A., Sreekantiah, A.,
              and H. Gredler, "Segment Routing Prefix SID extensions for
              BGP", draft-ietf-idr-bgp-prefix-sid-16 (work in progress),
              February 2018.

   [I-D.ietf-isis-segment-routing-extensions]
              Previdi, S., Ginsberg, L., Filsfils, C., Bashandy, A.,
              Gredler, H., Litkowski, S., Decraene, B., and J. Tantsura,
              "IS-IS Extensions for Segment Routing", draft-ietf-isis-
              segment-routing-extensions-15 (work in progress), December
              2017.

   [I-D.ietf-spring-segment-routing]
              Filsfils, C., Previdi, S., Ginsberg, L., Decraene, B.,
              Litkowski, S., and R. Shakir, "Segment Routing
              Architecture", draft-ietf-spring-segment-routing-15 (work
              in progress), January 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>.

   [RFC4271]  Rekhter, Y., Ed., Li, T., Ed., and S. Hares, Ed., "A
              Border Gateway Protocol 4 (BGP-4)", RFC 4271,
              DOI 10.17487/RFC4271, January 2006,
              <https://www.rfc-editor.org/info/rfc4271>.

   [RFC4659]  De Clercq, J., Ooms, D., Carugi, M., and F. Le Faucheur,
              "BGP-MPLS IP Virtual Private Network (VPN) Extension for
              IPv6 VPN", RFC 4659, DOI 10.17487/RFC4659, September 2006,
              <https://www.rfc-editor.org/info/rfc4659>.




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   [RFC5549]  Le Faucheur, F. and E. Rosen, "Advertising IPv4 Network
              Layer Reachability Information with an IPv6 Next Hop",
              RFC 5549, DOI 10.17487/RFC5549, May 2009,
              <https://www.rfc-editor.org/info/rfc5549>.

Appendix A.  Contributors

   Arjun Sreekantiah

   US

   Les Ginsberg
   Cisco Systems
   US
   Email: ginsberg@cisco.com

Authors' Addresses


   Gaurav Dawra (editor)
   LinkedIn
   USA

   Email: gdawra.ietf@gmail.com


   Clarence Filsfils
   Cisco Systems
   Belgium

   Email: cfilsfil@cisco.com


   Ketan Talaulikar (editor)
   Cisco Systems
   India

   Email: ketant@cisco.com


   Mach Chen
   Huawei
   China

   Email: mach.chen@huawei.com






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   Daniel Bernier
   Bell Canada
   Canada

   Email: daniel.bernier@bell.ca


   Jim Uttaro
   AT&T
   USA

   Email: ju1738@att.com


   Bruno Decraene
   Orange
   France

   Email: bruno.decraene@orange.com


   Hani Elmalky
   Ericsson
   USA

   Email: hani.elmalky@gmail.com

























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