Unified Identifier in IPv6 Segment Routing Networks
draft-mirsky-6man-unified-id-sr-03

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Last updated 2019-07-25
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Network                                                      C. Weiqiang
Internet-Draft                                              China Mobile
Intended status: Standards Track                               G. Mirsky
Expires: January 26, 2020                                      ZTE Corp.
                                                               P. Shaofu
                                                                L. Aihua
                                                         ZTE Corporation
                                                              W. Xiaolan
                                            New H3C Technologies Co. Ltd
                                                                  C. Wei
                                                                  Centec
                                                           July 25, 2019

          Unified Identifier in IPv6 Segment Routing Networks
                   draft-mirsky-6man-unified-id-sr-03

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 and IPv4 address, to support interworking between SR-MPLS and
   SRv6.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on January 26, 2020.

Weiqiang, et al.        Expires January 26, 2020                [Page 1]
Internet-Draft           Unified Identifier SRv6               July 2019

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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 . . . . . . . . . . . . . . . .   3
   2.  Segment Routing Extension Header: Benefits and Challenges . .   4
   3.  Support of Multiple SID Lengths in IPv6 Segment Routing
       Extension Header  . . . . . . . . . . . . . . . . . . . . . .   4
   4.  The Use Case of Unified Segment Identifier  . . . . . . . . .   6
     4.1.  Interworking Scenario Between SR-MPLS and SRv6  . . . . .   6
   5.  Operations with Unified Segment Identifier  . . . . . . . . .   8
     5.1.  Egress SR Tunnel Node . . . . . . . . . . . . . . . . . .   8
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   8
   9.  Normative References  . . . . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

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
   Routing can be applied in MPLS data plane by encoding 20-bits SIDs in
   MPLS label stack [I-D.ietf-spring-segment-routing-mpls].  It also can
   be applied to IPv6 data plane by encoding a list of 128-bits SIDs in
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