IGP Extensions for Shorter SRv6 SID
draft-chen-lsr-igp-shorter-srv6-extensions-02

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LSR WG                                                         Ran. Chen
Internet-Draft                                              Shaofu. Peng
Intended status: Standards Track                         ZTE Corporation
Expires: November 9, 2020                                    May 8, 2020

                  IGP Extensions for Shorter SRv6 SID
             draft-chen-lsr-igp-shorter-srv6-extensions-02

Abstract

   This document describes the IGP extensions required to support the
   Shorter SRv6 SIDs( Compressing SRv6 SIDs).

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   This Internet-Draft will expire on November 9, 2020.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Advertising Shorter SRv6 SIDs capabilities. . . . . . . . . .   2
     2.1.  IS-IS Extensions  . . . . . . . . . . . . . . . . . . . .   2
     2.2.  OSPFv3 Extensions . . . . . . . . . . . . . . . . . . . .   4
   3.  Advertising SRv6 SID Structure Sub-Sub-TLV  . . . . . . . . .   5
   4.  Advertising Endpoint Behaviors with U-Flavor  . . . . . . . .   6
   5.  Operations  . . . . . . . . . . . . . . . . . . . . . . . . .   6
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   8.  Normative References  . . . . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

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 scalabilities 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 IGP in order to to support the
   Shorter SRv6 SIDs contained in SID list that installed in dataplane.

2.  Advertising Shorter SRv6 SIDs capabilities.

2.1.  IS-IS Extensions

   A node indicates that it supports the SR Segment Endpoint Node
   functionality as specified in [RFC8754] by advertising a new SRv6
   Capabilities sub-TLV [I-D.ietf-lsr-isis-srv6-extensions] of the
   router capabilities TLV [RFC7981].

Chen & Peng             Expires November 9, 2020                [Page 2]
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   This document extensions the flags field in the SRv6 Capabilities
   sub-TLV [I-D.ietf-lsr-isis-srv6-extensions] to indicate the node
   supports the Shorter SRv6 SIDs.

        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
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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