OSPFv3 Extensions for Segment Routing
draft-ietf-ospf-ospfv3-segment-routing-extensions-12

Document Type Active Internet-Draft (lsr WG)
Last updated 2018-04-20
Replaces draft-psenak-ospf-segment-routing-ospfv3-extension
Stream IETF
Intended RFC status Proposed Standard
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Stream WG state WG Document (wg milestones: Jun 2017 - Standardize OSPFv3 S..., Nov 2018 - OSPFv3 SR to IESG... )
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Open Shortest Path First IGP                              P. Psenak, Ed.
Internet-Draft                                               C. Filsfils
Intended status: Standards Track                     Cisco Systems, Inc.
Expires: October 22, 2018                                S. Previdi, Ed.
                                                              Individual
                                                              H. Gredler
                                                            RtBrick Inc.
                                                               R. Shakir
                                                            Google, Inc.
                                                           W. Henderickx
                                                                   Nokia
                                                             J. Tantsura
                                                          Nuage Networks
                                                          April 20, 2018

                 OSPFv3 Extensions for Segment Routing
          draft-ietf-ospf-ospfv3-segment-routing-extensions-12

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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   and may be updated, replaced, or obsoleted by other documents at any

Psenak, et al.          Expires October 22, 2018                [Page 1]
Internet-Draft    OSPFv3 Extensions for Segment Routing       April 2018

   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on October 22, 2018.

Copyright Notice

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

   This document is subject to BCP 78 and the IETF Trust's Legal
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   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 . . . . . . . . . . . . . . . . . . .   6
     3.3.  SR Local Block TLV  . . . . . . . . . . . . . . . . . . .   8
     3.4.  SRMS Preference TLV . . . . . . . . . . . . . . . . . . .  10
   4.  OSPFv3 Extended Prefix Range TLV  . . . . . . . . . . . . . .  11
   5.  Prefix SID Sub-TLV  . . . . . . . . . . . . . . . . . . . . .  14
   6.  Adjacency Segment Identifier (Adj-SID)  . . . . . . . . . . .  17
     6.1.  Adj-SID Sub-TLV . . . . . . . . . . . . . . . . . . . . .  17
     6.2.  LAN Adj-SID Sub-TLV . . . . . . . . . . . . . . . . . . .  19
   7.  Elements of Procedure . . . . . . . . . . . . . . . . . . . .  20
     7.1.  Intra-area Segment routing in OSPFv3  . . . . . . . . . .  20
     7.2.  Inter-area Segment routing in OSPFv3  . . . . . . . . . .  22
     7.3.  Segment Routing for External Prefixes . . . . . . . . . .  23
     7.4.  Advertisement of Adj-SID  . . . . . . . . . . . . . . . .  23
       7.4.1.  Advertisement of Adj-SID on Point-to-Point Links  . .  23
       7.4.2.  Adjacency SID on Broadcast or NBMA Interfaces . . . .  23
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  24
     8.1.  OSPFv3 Extend-LSA TLV Registry  . . . . . . . . . . . . .  24
     8.2.  OSPFv3 Extend-LSA Sub-TLV registry  . . . . . . . . . . .  24
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