SRv6 vSID: Network Programming extension for variable length SIDs
draft-decraene-spring-srv6-vlsid-04

Document Type Active Internet-Draft (individual)
Authors Bruno Decraene  , Robert Raszuk  , Zhenbin Li  , Cheng Li 
Last updated 2020-09-11
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Network Working Group                                        B. Decraene
Internet-Draft                                                    Orange
Intended status: Standards Track                               R. Raszuk
Expires: March 15, 2021                                        Bloomberg
                                                                   Z. Li
                                                                   C. Li
                                                     Huawei Technologies
                                                      September 11, 2020

   SRv6 vSID: Network Programming extension for variable length SIDs
                  draft-decraene-spring-srv6-vlsid-04

Abstract

   This document proposes an extension to Segment Routing IPv6 (SRv6)
   Network Programming to allow for SRv6 Segment Identifier (SID) of
   smaller variable length.  The use of smaller SRv6 SID reduces the
   size the SRv6 Header (SRH).  This reduces the overhead for both the
   traffic volume and the network processor.  It is a straightforward
   extension to the SRv6 Network Programming model and its SRH
   encapsulation.

Status of This Memo

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   (https://trustee.ietf.org/license-info) in effect on the date of

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   2.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  SRv6 Variable Length SIDs . . . . . . . . . . . . . . . . . .   4
     3.1.  Encoding vSIDs in the SRH . . . . . . . . . . . . . . . .   5
     3.2.  SRv6 vSIDs Network Programming  . . . . . . . . . . . . .   7
   4.  Benefits  . . . . . . . . . . . . . . . . . . . . . . . . . .   8
   5.  Illustrations . . . . . . . . . . . . . . . . . . . . . . . .   9
     5.1.  Global vSIDs  . . . . . . . . . . . . . . . . . . . . . .   9
     5.2.  Local vSIDs . . . . . . . . . . . . . . . . . . . . . . .  10
   6.  Signaling vSIDs length  . . . . . . . . . . . . . . . . . . .  11
     6.1.  Signaling vSIDs length in IS-IS . . . . . . . . . . . . .  11
   7.  Optional extensions . . . . . . . . . . . . . . . . . . . . .  12
     7.1.  A node requiring a larger vSIDs length. . . . . . . . . .  12
     7.2.  Inter Routing Domains with the End.XvPS behavior  . . . .  14
     7.3.  NSIDs flavor  . . . . . . . . . . . . . . . . . . . . . .  15
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  15
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  15
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  16
   11. Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  16
   12. Changes / Authors Notes . . . . . . . . . . . . . . . . . . .  16
   13. References  . . . . . . . . . . . . . . . . . . . . . . . . .  17
     13.1.  Normative References . . . . . . . . . . . . . . . . . .  17
     13.2.  Informative References . . . . . . . . . . . . . . . . .  18
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  18

1.  Introduction

   The Segment Routing (SR) architecture is defined RFC 8402 [RFC8402].

   IPv6 Segment Routing Header (SRH) is defined RFC 8754 [RFC8754].

   SRv6 Network Programming is defined
   [I-D.ietf-spring-srv6-network-programming].

   The reader is expected to be familiar with the three above documents
   which define Segment Routing over the IPv6 data-plane (SRv6).

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