Generalized Segment Routing Header
draft-lc-6man-generalized-srh-01

Document Type Active Internet-Draft (individual)
Authors Zhenbin Li  , Cheng Li  , Weiqiang Cheng  , Chongfeng Xie  , Li Cong  , Hui Tian  , Feng Zhao 
Last updated 2020-08-13
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SPRING Working Group                                               Z. Li
Internet-Draft                                                     C. Li
Intended status: Standards Track                     Huawei Technologies
Expires: February 15, 2021                                      W. Cheng
                                                            China Mobile
                                                                  C. Xie
                                                                   C. Li
                                                           China Telecom
                                                                 H. Tian
                                                                 F. Zhao
                                                                   CAICT
                                                         August 14, 2020

                   Generalized Segment Routing Header
                    draft-lc-6man-generalized-srh-01

Abstract

   Generalized SRv6 network programming defines the enhanced mechanisms
   of SRv6 to encode SRv6 SIDs, Compressed SIDs and even the MPLS labels
   or IPv4 tunnel information in a single SRH.  This type of SRH is
   called Generalized SRH (G-SRH), which can reduce the overhead of SRv6
   and also provide more flexibility for network programming.  This
   document defines the encapsulation and packet processing of G-SRH.

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
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

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   This Internet-Draft will expire on February 15, 2021.

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Li, et al.              Expires February 15, 2021               [Page 1]
Internet-Draft                    G-SRH                      August 2020

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   3.  Generalized Segment Identifier  . . . . . . . . . . . . . . .   4
     3.1.  SRv6 G-SID  . . . . . . . . . . . . . . . . . . . . . . .   4
     3.2.  Compression G-SID . . . . . . . . . . . . . . . . . . . .   4
     3.3.  MPLS G-SID  . . . . . . . . . . . . . . . . . . . . . . .   5
     3.4.  IPv4 G-SID  . . . . . . . . . . . . . . . . . . . . . . .   6
   4.  Generalized Segment Routing Header (G-SRH)  . . . . . . . . .   7
     4.1.  G-SRH for SRv6 Compression  . . . . . . . . . . . . . . .   8
     4.2.  G-SRH for Crossing SR-MPLS Domains  . . . . . . . . . . .  10
     4.3.  G-SRH for Crossing IPv4 Domains . . . . . . . . . . . . .  11
   5.  Packet Processing . . . . . . . . . . . . . . . . . . . . . .  14
     5.1.  Crossing SRv6 Compression Domains . . . . . . . . . . . .  14
     5.2.  Crossing SR-MPLS Domains  . . . . . . . . . . . . . . . .  17
       5.2.1.  END.M . . . . . . . . . . . . . . . . . . . . . . . .  17
     5.3.  Crossing IPv4 Domains . . . . . . . . . . . . . . . . . .  17
       5.3.1.  END.4 . . . . . . . . . . . . . . . . . . . . . . . .  17
       5.3.2.  END.B4  . . . . . . . . . . . . . . . . . . . . . . .  18
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  19
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  19
   8.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  19
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  19
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  19
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  19
     10.2.  Informative References . . . . . . . . . . . . . . . . .  20
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  20

1.  Introduction
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