Open Shortest Path First IGP                              P. Psenak, Ed.
Internet-Draft                                       Cisco Systems, Inc.
Intended status: Standards Track                         S. Previdi, Ed.
Expires: April 24, 2019                                       Individual
                                                        October 21, 2018


                 OSPFv3 Extensions for Segment Routing
          draft-ietf-ospf-ospfv3-segment-routing-extensions-16

Abstract

   Segment Routing (SR) allows a flexible definition of end-to-end paths
   within IGP topologies by encoding paths as sequences of topological
   sub-paths, called "segments".  These segments are advertised by the
   link-state routing protocols (IS-IS and OSPF).

   This draft describes the OSPFv3 extensions required for Segment
   Routing.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on April 24, 2019.

Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.




Psenak & Previdi         Expires April 24, 2019                 [Page 1]

Internet-Draft    OSPFv3 Extensions for Segment Routing     October 2018


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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Segment Routing Identifiers . . . . . . . . . . . . . . . . .   3
     2.1.  SID/Label Sub-TLV . . . . . . . . . . . . . . . . . . . .   3
   3.  Segment Routing Capabilities  . . . . . . . . . . . . . . . .   4
     3.1.  SR-Algorithm TLV  . . . . . . . . . . . . . . . . . . . .   4
     3.2.  SID/Label Range TLV . . . . . . . . . . . . . . . . . . .   5
     3.3.  SR Local Block TLV  . . . . . . . . . . . . . . . . . . .   7
     3.4.  SRMS Preference TLV . . . . . . . . . . . . . . . . . . .   9
   4.  OSPFv3 Extended Prefix Range TLV  . . . . . . . . . . . . . .  10
   5.  Prefix SID Sub-TLV  . . . . . . . . . . . . . . . . . . . . .  13
   6.  Adjacency Segment Identifier (Adj-SID)  . . . . . . . . . . .  16
     6.1.  Adj-SID Sub-TLV . . . . . . . . . . . . . . . . . . . . .  17
     6.2.  LAN Adj-SID Sub-TLV . . . . . . . . . . . . . . . . . . .  18
   7.  Elements of Procedure . . . . . . . . . . . . . . . . . . . .  19
     7.1.  Intra-area Segment routing in OSPFv3  . . . . . . . . . .  19
     7.2.  Inter-area Segment routing in OSPFv3  . . . . . . . . . .  20