OSPF Extensions for Segment Routing
draft-ietf-ospf-segment-routing-extensions-05

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Last updated 2015-06-26
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Open Shortest Path First IGP                              P. Psenak, Ed.
Internet-Draft                                           S. Previdi, Ed.
Intended status: Standards Track                             C. Filsfils
Expires: December 28, 2015                           Cisco Systems, Inc.
                                                              H. Gredler
                                                  Juniper Networks, Inc.
                                                               R. Shakir
                                                         British Telecom
                                                           W. Henderickx
                                                          Alcatel-Lucent
                                                             J. Tantsura
                                                                Ericsson
                                                           June 26, 2015

                  OSPF Extensions for Segment Routing
             draft-ietf-ospf-segment-routing-extensions-05

Abstract

   Segment Routing (SR) allows for 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 OSPF 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 RFC 2119 [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
   Task Force (IETF).  Note that other groups may also distribute
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   material or to cite them other than as "work in progress."

Psenak, et al.          Expires December 28, 2015               [Page 1]
Internet-Draft     OSPF Extensions for Segment Routing         June 2015

   This Internet-Draft will expire on December 28, 2015.

Copyright Notice

   Copyright (c) 2015 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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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Segment Routing Identifiers . . . . . . . . . . . . . . . . .   3
     2.1.  SID/Label Sub-TLV . . . . . . . . . . . . . . . . . . . .   4
   3.  Segment Routing Capabilities  . . . . . . . . . . . . . . . .   4
     3.1.  SR-Algorithm TLV  . . . . . . . . . . . . . . . . . . . .   4
     3.2.  SID/Label Range TLV . . . . . . . . . . . . . . . . . . .   5
   4.  OSPF Extended Prefix Range TLV  . . . . . . . . . . . . . . .   7
   5.  Prefix SID Sub-TLV  . . . . . . . . . . . . . . . . . . . . .   9
   6.  SID/Label Binding Sub-TLV . . . . . . . . . . . . . . . . . .  13
     6.1.  ERO Metric Sub-TLV  . . . . . . . . . . . . . . . . . . .  14
     6.2.  ERO Sub-TLVs  . . . . . . . . . . . . . . . . . . . . . .  15
       6.2.1.  IPv4 ERO Sub-TLV  . . . . . . . . . . . . . . . . . .  15
       6.2.2.  Unnumbered Interface ID ERO Sub-TLV . . . . . . . . .  16
       6.2.3.  IPv4 Backup ERO Sub-TLV . . . . . . . . . . . . . . .  17
       6.2.4.  Unnumbered Interface ID Backup ERO Sub-TLV  . . . . .  18
   7.  Adjacency Segment Identifier (Adj-SID)  . . . . . . . . . . .  19
     7.1.  Adj-SID Sub-TLV . . . . . . . . . . . . . . . . . . . . .  19
     7.2.  LAN Adj-SID Sub-TLV . . . . . . . . . . . . . . . . . . .  21
   8.  Elements of Procedure . . . . . . . . . . . . . . . . . . . .  22
     8.1.  Intra-area Segment routing in OSPFv2  . . . . . . . . . .  22
     8.2.  Inter-area Segment routing in OSPFv2  . . . . . . . . . .  23
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