Unified Identifier in IPv6 Segment Routing Networks
draft-mirsky-6man-unified-id-sr-04

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Last updated 2019-11-04
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Network                                                      C. Weiqiang
Internet-Draft                                              China Mobile
Intended status: Standards Track                               G. Mirsky
Expires: May 6, 2020                                           ZTE Corp.
                                                               P. Shaofu
                                                                L. Aihua
                                                         ZTE Corporation
                                                              W. Xiaolan
                                            New H3C Technologies Co. Ltd
                                                                  C. Wei
                                                                  Centec
                                                                S. Zadok
                                                                Broadcom
                                                        November 3, 2019

          Unified Identifier in IPv6 Segment Routing Networks
                   draft-mirsky-6man-unified-id-sr-04

Abstract

   Segment Routing architecture leverages the paradigm of source
   routing.  It can be realized in a network data plane by prepending
   the packet with a list of instructions, a.k.a. segments.  A segment
   can be encoded as a Multi-Protocol Label Switching (MPLS) label, IPv4
   address, or IPv6 address.  Segment Routing can be applied in MPLS
   data plane by encoding segments in MPLS label stack.  It also can be
   applied to IPv6 data plane by encoding a list of segment identifiers
   in IPv6 Segment Routing Extension Header (SRH).  This document
   extends the use of the SRH to unified identifiers encoded as MPLS
   label or IPv4 address, to compress the SRH, and support support more
   detailed network programming and interworking between SR-MPLS and
   SRv6 domains.

Status of This Memo

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Weiqiang, et al.           Expires May 6, 2020                  [Page 1]
Internet-Draft           Unified Identifier SRv6           November 2019

   This Internet-Draft will expire on May 6, 2020.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Conventions used in this document . . . . . . . . . . . .   3
       1.1.1.  Terminology . . . . . . . . . . . . . . . . . . . . .   3
       1.1.2.  Requirements Language . . . . . . . . . . . . . . . .   4
   2.  Segment Routing Extension Header: Benefits and Challenges . .   4
   3.  Unified SIDs in IPv6 Segment Routing Extension Header . . . .   4
   4.  The Use Case of Unified Segment Identifier  . . . . . . . . .   6
     4.1.  Interworking Between SR-MPLS and SRv6 Using U-SID . . . .   6
   5.  Operations with Unified Segment Identifier  . . . . . . . . .   7
     5.1.  Procedures of SR-MPLS over IP . . . . . . . . . . . . . .   8
     5.2.  Packet Forwarding . . . . . . . . . . . . . . . . . . . .   8
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  10
   9.  Normative References  . . . . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Introduction

   Segment Routing architecture [RFC8402] leverages the paradigm of
   source routing.  It can be realized in a network data plane by
   prepending the packet with a list of instructions, a.k.a. segment
   identifiers (SIDs).  A segment can be encoded as a Multi-Protocol
   Label Switching (MPLS) label, IPv4 address, or IPv6 address.  Segment
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