Compressed SRv6 SID List Requirements
draft-srcompdt-spring-compression-requirement-00

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Document Type Active Internet-Draft (individual)
Authors Weiqiang Cheng  , Sander Steffann 
Last updated 2020-11-02
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SPRING                                                          W. Cheng
Internet-Draft                                              China Mobile
Intended status: Informational                               S. Steffann
Expires: May 3, 2021                            SJM Steffann Consultancy
                                                        October 30, 2020

                 Compressed SRv6 SID List Requirements
          draft-srcompdt-spring-compression-requirement-00

Abstract

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

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   This Internet-Draft will expire on May 3, 2021.

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Cheng & Steffann           Expires May 3, 2021                  [Page 1]
Internet-Draft             SRCOMP Requirements              October 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 . . . . . . . . . . . . . . . .   4
       3.1.3.  State Efficiency  . . . . . . . . . . . . . . . . . .   5
   4.  SRv6 Specific Requirements  . . . . . . . . . . . . . . . . .   5
     4.1.  Functional Requirements . . . . . . . . . . . . . . . . .   5
       4.1.1.  SRv6 Based  . . . . . . . . . . . . . . . . . . . . .   5
       4.1.2.  SRv6 Functionality  . . . . . . . . . . . . . . . . .   5
       4.1.3.  SID list length . . . . . . . . . . . . . . . . . . .   5
       4.1.4.  SID summarization . . . . . . . . . . . . . . . . . .   6
       4.1.5.  Heterogeneous SID lists . . . . . . . . . . . . . . .   6
     4.2.  Operational Requirements  . . . . . . . . . . . . . . . .   6
       4.2.1.  Lossless Compression  . . . . . . . . . . . . . . . .   6
     4.3.  Scalability Requirements  . . . . . . . . . . . . . . . .   6
   5.  Protocol Design Requirements  . . . . . . . . . . . . . . . .   6
     5.1.  Ships in the Night Deployment . . . . . . . . . . . . . .   7
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   8.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   7
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   8
   10. Normative References  . . . . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

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
   strict path TE, may require long SRv6 SID lists.  There are several
   proposed methods to reduce the resulting SRv6 encapsulation size by
   compressing the SID list.

   The SPRING working group formed a design team to define requirements
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