Unified Identifier in IPv6 Segment Routing Networks
draft-mirsky-6man-unified-id-sr-09

Document Type Active Internet-Draft (individual)
Authors Weiqiang Cheng  , Greg Mirsky  , Shaofu Peng  , Liu Aihua  , Gyan Mishra 
Last updated 2021-03-30
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Network                                                      C. Weiqiang
Internet-Draft                                              China Mobile
Intended status: Standards Track                               G. Mirsky
Expires: 1 October 2021                                        ZTE Corp.
                                                               P. Shaofu
                                                                L. Aihua
                                                         ZTE Corporation
                                                               G. Mishra
                                                            Verizon Inc.
                                                           30 March 2021

          Unified Identifier in IPv6 Segment Routing Networks
                   draft-mirsky-6man-unified-id-sr-09

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 the 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 segment identifiers
   encoded, for example, as MPLS label or IPv4 address, to compress the
   SRH, and support more detailed network programming and interworking
   between SR-MPLS and SRv6 domains.

Status of This Memo

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   This Internet-Draft will expire on 1 October 2021.

Weiqiang, et al.         Expires 1 October 2021                 [Page 1]
Internet-Draft           Unified Identifier SRv6              March 2021

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Conventions used in this document . . . . . . . . . . . .   3
       1.1.1.  Acronyms  . . . . . . . . . . . . . . . . . . . . . .   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.  Operations with Unified Segment Identifier  . . . . . . . . .   6
     4.1.  Procedures of 32bits MPLS Label within SRH  . . . . . . .   7
       4.1.1.  Packet Forwarding Based on UET-MPLS U-SID . . . . . .   8
     4.2.  Procedures of 32bits IP Address within SRH  . . . . . . .   9
       4.2.1.  Packet Forwarding Based on UET-32 U-SID . . . . . . .  10
   5.  The Use Case of Unified Segment Identifier  . . . . . . . . .  11
     5.1.  Nesting Interworking Between SR-MPLS and SRv6 Using Binding
           U-SID . . . . . . . . . . . . . . . . . . . . . . . . . .  12
     5.2.  Flat Interworking Between Different UET Domain Using Mixing
           U-SID . . . . . . . . . . . . . . . . . . . . . . . . . .  15
       5.2.1.  UET Capability Advertisement  . . . . . . . . . . . .  15
       5.2.2.  SRv6 SID Allocated per UEC  . . . . . . . . . . . . .  16
       5.2.3.  Packets Forwarding Procedures . . . . . . . . . . . .  17
   6.  Control Plane in Support of Unified SID . . . . . . . . . . .  21
   7.  SRH with U-SID Pseudo-code  . . . . . . . . . . . . . . . . .  22
   8.  U-SID supporting SRv6 programming . . . . . . . . . . . . . .  23
   9.  Benefits  . . . . . . . . . . . . . . . . . . . . . . . . . .  24
   10. Implementation Considerations . . . . . . . . . . . . . . . .  24
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