Truncated SID Inter Domain Considerations
draft-peng-spring-truncated-sid-inter-domain-00

Document Type Active Internet-Draft (individual)
Author Shaofu Peng 
Last updated 2021-01-04
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SPRING Working Group                                        Shaofu. Peng
Internet-Draft                                           ZTE Corporation
Intended status: Standards Track                         January 4, 2021
Expires: July 8, 2021

               Truncated SID Inter Domain Considerations
            draft-peng-spring-truncated-sid-inter-domain-00

Abstract

   This document introduces a method for interworking between domains of
   Segment Routing in IPv6 network that use different levels of Segment
   Identifier's compression.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions used in this document . . . . . . . . . . . . . .   3
     2.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   3.  Interworking Between Different Domains  . . . . . . . . . . .   3
   4.  Control Plane Extensions  . . . . . . . . . . . . . . . . . .   5
     4.1.  Extensions to BGP-LS  . . . . . . . . . . . . . . . . . .   5
     4.2.  Extensions to IGP . . . . . . . . . . . . . . . . . . . .   5
       4.2.1.  Extensions to IS-IS . . . . . . . . . . . . . . . . .   5
       4.2.2.  Extensions to OSPFv3  . . . . . . . . . . . . . . . .   6
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
     6.1.  BGP-LS SRv6 SID Swapped Block Sub-TLV . . . . . . . . . .   7
     6.2.  IS-IS SRv6 SID Swapped Block Sub-TLV  . . . . . . . . . .   7
     6.3.  OSPFv3 SRv6 SID Swapped Block Sub-TLV . . . . . . . . . .   7
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   Segment Routing [RFC8402] leverages the source routing paradigm.  An
   ingress node steers a packet through an ordered list of instructions,
   called segments.  [I-D.ietf-spring-srv6-network-programming] proposes
   the Segment Routing in IPv6 (SRv6) Network Programming to specify a
   packet processing program by encoding a sequence of instructions in
   the IPv6 packet's extension header.
   [I-D.ietf-spring-srv6-network-programming] defined a Segment
   Identifier (SID) as consisting of LOC:FUNCT:ARG, where a locator
   (LOC) is encoded in the L most significant bits of the SID, followed
   by F bits of function (FUNCT) and A bits of arguments (ARG).  A
   locator may be represented as B:N where B is the SRv6 SID block (IPv6
   prefix allocated for SRv6 SIDs by the operator) and N is the
   identifier of the parent node instantiating the SID.  Note that "SID
   Locator Block" and "BLOCK" are used interchangeably throughout the
   document.

   As demonstrated in several proposals, such as
   [I-D.cl-spring-generalized-srv6-for-cmpr] and
   [I-D.mirsky-6man-unified-id-sr], SIDs could be allocated by SRv6
   nodes from within the same SRv6 SID Locator Block, and referring to
   the idea described in [RFC6554] SRH only needs to store the
   difference between SIDs, such as NODE:FUNCT:ARGS, the non-BLOCK part,
   and does not need to contain the SRv6 SID Locator Block information.
   In this case, some or all SIDs encoded in the SRH are the non-BLOCK
   part of the 128-bit SIDs.

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