Compressed SRv6 Network Programming
draft-li-spring-compressed-srv6-np-00

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SPRING Working Group                                               Z. Li
Internet-Draft                                                     C. Li
Intended status: Standards Track                                 S. Peng
Expires: January 23, 2020                                        Z. Wang
                                                                  B. Liu
                                                     Huawei Technologies
                                                           July 22, 2019

                  Compressed SRv6 Network Programming
                 draft-li-spring-compressed-srv6-np-00

Abstract

   Segment Routing can be applied to the IPv6 data plane by leveraging a
   new type of Routing Extension Header, called Segment Routing
   Header(SRH).  However, the overhead introduced by SRH may be a
   challenge for the current hardware capability, which would have much
   effect on the forwarding performance and the payload efficiency.

   This document defines a compressed SRv6 network programming mechanism
   in order to reduce the overhead of SRv6 by introducing the Compressed
   Segment Identifier(C-SID) and the Compressed SRH(C-SRH).  The C-SRH
   can be a new Routing Header or an enhancement of SRH, which is
   compatible with SRH well.

Status of This Memo

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Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Li, et al.              Expires January 23, 2020                [Page 1]
Internet-Draft             Compressed SRv6 NP                  July 2019

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   3.  Compressed SID(C-SID) . . . . . . . . . . . . . . . . . . . .   3
   4.  Compressed Segment Routing Header(C-SRH)  . . . . . . . . . .   4
   5.  C-SRH Processing  . . . . . . . . . . . . . . . . . . . . . .   7
   6.  Illustration  . . . . . . . . . . . . . . . . . . . . . . . .   9
     6.1.  Reference Diagram . . . . . . . . . . . . . . . . . . . .   9
     6.2.  Compressed SRv6 Forwarding Example  . . . . . . . . . . .   9
   7.  Benefits  . . . . . . . . . . . . . . . . . . . . . . . . . .  11
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  13
     10.2.  Informative References . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  14

1.  Introduction

   Segment routing (SR) [RFC8402] is a source routing paradigm that
   explicitly indicates the forwarding path for packets at the ingress
   node by inserting an ordered list of instructions, called segments.

   When segment routing is deployed on IPv6 data plane, it is called
   SRv6 [I-D.ietf-6man-segment-routing-header].An SRv6 Segment ID(SID)
   is a 128-bit value, and it can be represented as LOC:FUNCT where LOC
   is the L most significant bits and FUNCT is the 128-L least
   significant bits [I-D.ietf-spring-srv6-network-programming].  L is
   called the locator length and is flexible.  Each operator is free to
   use the locator length it chooses.  The LOC part of the SID is
   routable and leads to the node which instantiates that SID.

   For supporting SR, a new routing header called Segment Routing Header
   (SRH), which contains a list of SIDs and other information such as
   Segments Left, has been defined in
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