SRv6 Network Programming Overhead Analysis
draft-dukes-spring-srv6-overhead-analysis-00

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SPRING                                                     D. Dukes, Ed.
Internet-Draft                                             Cisco Systems
Intended status: Informational                             June 27, 2020
Expires: December 29, 2020

               SRv6 Network Programming Overhead Analysis
              draft-dukes-spring-srv6-overhead-analysis-00

Abstract

   SRv6 network programming provides the framework for the best
   compression of an IPv6 header within an SR domain.  This document
   provides the analysis to illustrate this fact.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Reference Topology  . . . . . . . . . . . . . . . . . . . . .   2
   3.  Reference Scenario  . . . . . . . . . . . . . . . . . . . . .   3
   4.  Compression Analysis  . . . . . . . . . . . . . . . . . . . .   4
     4.1.  SRv6  . . . . . . . . . . . . . . . . . . . . . . . . . .   4
       4.1.1.  NEXT-C-SID  . . . . . . . . . . . . . . . . . . . . .   4
       4.1.2.  REPLACE-C-SID . . . . . . . . . . . . . . . . . . . .   4
       4.1.3.  Encapsulation Size  . . . . . . . . . . . . . . . . .   5
     4.2.  SRm6  . . . . . . . . . . . . . . . . . . . . . . . . . .   5
       4.2.1.  SID list  . . . . . . . . . . . . . . . . . . . . . .   6
       4.2.2.  Encapsulation size with CRH-16  . . . . . . . . . . .   6
       4.2.3.  Encapsulation size with CRH-32  . . . . . . . . . . .   6
     4.3.  Encapsulation size saving compared to uncompressed SRv6 .   6
     4.4.  Numerical Application . . . . . . . . . . . . . . . . . .   6
       4.4.1.  Evaluation parameters . . . . . . . . . . . . . . . .   7
       4.4.2.  Evaluation results  . . . . . . . . . . . . . . . . .   7
   5.  Conclusion  . . . . . . . . . . . . . . . . . . . . . . . . .   8
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   SRv6 Network Programming [I-D.ietf-spring-srv6-network-programming]
   defines a framework to build a network program with topological and
   service segments carried in a Segment Routing header (SRH) [RFC8754].
   The SRv6 Network Programming framework natively allows for long
   segment lists to be encoded in the SRH in a compressed fashion, as
   described in [I-D.filsfilscheng-spring-srv6-srh-comp-sl-enc].

   This document provides a detailed analysis of the efficiency of this
   compression in a realistic SRv6 deployment scenario.  In particular,
   it evaluates the encapsulation size of a compressed segment lists
   against uncompressed segment lists.

   This document also shows that a mapping solution does not provide
   better compression than what can be achieved with the SRv6 mechanism.
   As such, analysis of the SRm6 proposal documented in
   [I-D.bonica-spring-sr-mapped-six] is provided for comparison.

2.  Reference Topology

   The following topology is used throughout the remainder of this
   document.

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