Compressed SRv6 SID List Requirements
draft-srcompdt-spring-compression-requirement-02

Document Type Active Internet-Draft (individual)
Author Weiqiang Cheng 
Last updated 2020-11-18
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SPRING                                                          W. Cheng
Internet-Draft                                              China Mobile
Intended status: Informational                         November 16, 2020
Expires: May 20, 2021

                 Compressed SRv6 SID List Requirements
            draft-srcompdt-spring-compression-requirement-02

Abstract

   This document specifies requirements for solutions to compress SRv6
   SID lists.

Status of This Memo

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   This Internet-Draft will expire on May 20, 2021.

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Cheng                     Expires May 20, 2021                  [Page 1]
Internet-Draft             SRCOMP Requirements             November 2020

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions used in this document . . . . . . . . . . . . . .   3
     2.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
     2.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  SRv6 SID List Compression Requirements  . . . . . . . . . . .   4
     3.1.  Dataplane Efficiency and Performance Requirements . . . .   4
       3.1.1.  Encapsulation Header Size . . . . . . . . . . . . . .   4
       3.1.2.  Forwarding Efficiency . . . . . . . . . . . . . . . .   5
       3.1.3.  State Efficiency  . . . . . . . . . . . . . . . . . .   5
   4.  SRv6 Specific Requirements  . . . . . . . . . . . . . . . . .   5
     4.1.  Functional Requirements . . . . . . . . . . . . . . . . .   5
       4.1.1.  SID list length . . . . . . . . . . . . . . . . . . .   5
       4.1.2.  SID summarization . . . . . . . . . . . . . . . . . .   6
     4.2.  Operational Requirements  . . . . . . . . . . . . . . . .   6
       4.2.1.  Lossless Compression  . . . . . . . . . . . . . . . .   6
     4.3.  Scalability Requirements  . . . . . . . . . . . . . . . .   6
       4.3.1.  Adjacency segment scale . . . . . . . . . . . . . . .   6
       4.3.2.  Prefix segment scale  . . . . . . . . . . . . . . . .   7
       4.3.3.  Service Scale . . . . . . . . . . . . . . . . . . . .   7
   5.  Protocol Design Requirements  . . . . . . . . . . . . . . . .   7
     5.1.  SRv6 Base Coexistence . . . . . . . . . . . . . . . . . .   7
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   8.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   8
   9.  Normative References  . . . . . . . . . . . . . . . . . . . .   8
   Appendix A.  Proposed Requirements  . . . . . . . . . . . . . . .  10
     A.1.  Introduction  . . . . . . . . . . . . . . . . . . . . . .  10
     A.2.  Requirements  . . . . . . . . . . . . . . . . . . . . . .  10
       A.2.1.  SRv6 Based  . . . . . . . . . . . . . . . . . . . . .  10
       A.2.2.  SRv6 Functionality  . . . . . . . . . . . . . . . . .  11
       A.2.3.  Heterogeneous SID lists . . . . . . . . . . . . . . .  13
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  13

1.  Introduction

   The SPRING working group defined SRv6, with [RFC8402] describing how
   the Segment Routing (SR) architecture is instantiated on two data-
   planes: SR over MPLS (SR-MPLS) and SR over IPv6 (SRv6).  SRv6 uses a
   routing header called the SR Header (SRH) [RFC8754] and defines SRv6
   SID behaviors and a registry for identifying them in
   [I-D.ietf-spring-srv6-network-programming].  SRv6 is a proposed
   standard and is deployed today.

   The SPRING working group has observed that some use cases, such as
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