BGP-LS Extensions for Shorter SRv6 SID
draft-liu-idr-bgp-ls-shorter-srv6-extensions-01

Document Type Active Internet-Draft (individual)
Authors Liu Yao  , Shaofu Peng 
Last updated 2020-10-15
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IDR WG                                                          Yao. Liu
Internet-Draft                                              Shaofu. Peng
Intended status: Standards Track                         ZTE Corporation
Expires: April 19, 2021                                 October 16, 2020

                 BGP-LS Extensions for Shorter SRv6 SID
            draft-liu-idr-bgp-ls-shorter-srv6-extensions-01

Abstract

   This document describes the BGP-LS extensions required to support the
   Shorter SRv6 SIDs(Compressing SRv6 SIDs).

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Advertising Shorter SRv6 SIDs capabilities  . . . . . . . . .   2
   3.  Advertising SRv6 SID Structure TLV  . . . . . . . . . . . . .   4
   4.  Advertising SRv6 SID Endpoint Behaviors with UET-Flavor . . .   4
   5.  Operations  . . . . . . . . . . . . . . . . . . . . . . . . .   5
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   8.  Normative References  . . . . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   Segment Routing [RFC8402] leverages the source routing paradigm.  An
   ingress node steers a packet through an ordered list of instructions,
   called segments.

   Segment Routing can be directly instantiated on the IPv6 data plane
   through the use of the Segment Routing Header defined in [RFC8754].
   SRv6 refers to this SR instantiation on the IPv6 dataplane.

   However, the size of the SRv6 SID presents a scalability challenge to
   use topological instructions that define a strict explicitly routed
   path in combination with service-based instructions.  At the same
   time, the size of the SRH/SID may be a challenge for some data plane
   processors and traffic overhead.
   [I-D.cheng-spring-shorter-srv6-sid-requirement] describes a list of
   requirements for the use of a shortened identifier in a segment
   routing network with the IPv6 data plane.

   [I-D.mirsky-6man-unified-id-sr] proposed an extension of SRH that
   enables the use of a shorter segment identifier in dataplane, such as
   32-bits Label format SID or 32-bits IP address format SID.

   This document defines extensions to BGP-LS in order to to support the
   advertisement of Shorter SRv6 SIDs contained in SID list that
   installed in dataplane.

2.  Advertising Shorter SRv6 SIDs capabilities

   A node indicates that it supports the SR Segment Endpoint Node
   functionality as specified in [RFC8754] by advertising a SRv6
   Capabilities TLV [I-D.ietf-idr-bgpls-srv6-ext] of the node NLRI.

   This document extends the flags field in the SRv6 Capabilities TLV
   [I-D.ietf-idr-bgpls-srv6-ext] to indicate that the node supports the
   Shorter SRv6 SIDs, where,

Liu & Peng               Expires April 19, 2021                 [Page 2]
Internet-Draft         BGP-LS for Shorter SRv6 SID          October 2020

        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       | UEC |         Reserved              |
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