Generalized SRv6 Network Programming
draft-cl-spring-generalized-srv6-np-00

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SPRING Working Group                                            W. Cheng
Internet-Draft                                              China Mobile
Intended status: Standards Track                                   Z. Li
Expires: August 14, 2020                                           C. Li
                                                     Huawei Technologies
                                                                  C. Xie
                                                                   C. Li
                                                           China Telecom
                                                                 H. Tian
                                                                 F. Zhao
                                                                   CAICT
                                                       February 11, 2020

                  Generalized SRv6 Network Programming
                 draft-cl-spring-generalized-srv6-np-00

Abstract

   As the deployment of SRv6, some new requirements are proposed, such
   as SRv6 compression, transporting over SR-MPLS/MPLS and IPv4 domains.
   Therefore, it is necessary to consider other types of segments or
   sub-paths in the end-to-end SRv6 network programming.

   This document proposes Generalized Segment Routing over IPv6 (G-SRv6)
   Networking Programming, which supports to encode multiple types of
   Segments in a SRH, called Generalized SRH (G-SRH).  These Segments
   can be called Generalized Segment, and the ID can be Generalized
   Segment Identifier (G-SID), which may include an SRv6 SID(128 bits),
   C-SIDs, MPLS labels, or IPv4 tunnel information.

   This document also defines the mechanisms of Generalized SRv6
   Networking Programming and the requirements of related protocol
   extensions of control plane and data plane.

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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   and may be updated, replaced, or obsoleted by other documents at any

Cheng, et al.            Expires August 14, 2020                [Page 1]
Internet-Draft                   G-SRv6                    February 2020

   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 14, 2020.

Copyright Notice

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   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  Requirements Language . . . . . . . . . . . . . . . . . .   5
   3.  Requirements  . . . . . . . . . . . . . . . . . . . . . . . .   5
     3.1.  Crossing C-SRv6 Domains . . . . . . . . . . . . . . . . .   5
     3.2.  Crossing SR-MPLS Domains  . . . . . . . . . . . . . . . .   7
     3.3.  Crossing IPv4 Domains . . . . . . . . . . . . . . . . . .   8
   4.  Concept of Generalized SRv6 . . . . . . . . . . . . . . . . .   9
     4.1.  SRv6 G-SID  . . . . . . . . . . . . . . . . . . . . . . .  10
     4.2.  Compression G-SID . . . . . . . . . . . . . . . . . . . .  10
     4.3.  MPLS G-SID  . . . . . . . . . . . . . . . . . . . . . . .  11
     4.4.  IPv4 G-SID  . . . . . . . . . . . . . . . . . . . . . . .  12
   5.  G-SRv6 for Crossing SRv6 Compression Domains  . . . . . . . .  13
     5.1.  Mechanisms  . . . . . . . . . . . . . . . . . . . . . . .  13
       5.1.1.  Compressable SID Indication . . . . . . . . . . . . .  13
       5.1.2.  C-SID Length Indication . . . . . . . . . . . . . . .  14
       5.1.3.  Start of Compression Indication . . . . . . . . . . .  14
       5.1.4.  End of Compression Indication . . . . . . . . . . . .  15
     5.2.  Illustration  . . . . . . . . . . . . . . . . . . . . . .  16
     5.3.  Effect on SRv6  . . . . . . . . . . . . . . . . . . . . .  18
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