BGP Link-State extensions for Segment Routing
draft-ietf-idr-bgp-ls-segment-routing-ext-01

Document Type Active Internet-Draft (idr WG)
Last updated 2017-02-09
Replaces draft-gredler-idr-bgp-ls-segment-routing-ext
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Inter-Domain Routing                                     S. Previdi, Ed.
Internet-Draft                                                 P. Psenak
Intended status: Standards Track                             C. Filsfils
Expires: August 13, 2017                             Cisco Systems, Inc.
                                                              H. Gredler
                                                            RtBrick Inc.
                                                                 M. Chen
                                                     Huawei Technologies
                                                             J. Tantsura
                                                              Individual
                                                        February 9, 2017

             BGP Link-State extensions for Segment Routing
              draft-ietf-idr-bgp-ls-segment-routing-ext-01

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, OSPF and
   OSPFv3).

   This draft defines extensions to the BGP Link-state address-family in
   order to carry segment information via BGP.

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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Previdi, et al.          Expires August 13, 2017                [Page 1]
Internet-Draft    BGP LS extensions for Segment Routing    February 2017

   This Internet-Draft will expire on August 13, 2017.

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  BGP-LS Extensions for Segment Routing . . . . . . . . . . . .   5
     2.1.  Node Attributes TLVs  . . . . . . . . . . . . . . . . . .   5
       2.1.1.  SR-Capabilities TLV . . . . . . . . . . . . . . . . .   5
       2.1.2.  SR-Algorithm TLV  . . . . . . . . . . . . . . . . . .   6
       2.1.3.  SR Local Block TLV  . . . . . . . . . . . . . . . . .   7
       2.1.4.  SRMS Preference TLV . . . . . . . . . . . . . . . . .   7
     2.2.  Link Attribute TLVs . . . . . . . . . . . . . . . . . . .   8
       2.2.1.  Adjacency SID TLV . . . . . . . . . . . . . . . . . .   9
       2.2.2.  LAN Adjacency SID TLV . . . . . . . . . . . . . . . .   9
     2.3.  Prefix Attribute TLVs . . . . . . . . . . . . . . . . . .  10
       2.3.1.  Prefix-SID TLV  . . . . . . . . . . . . . . . . . . .  11
       2.3.2.  IPv6 Prefix-SID TLV . . . . . . . . . . . . . . . . .  12
       2.3.3.  IGP Prefix Attributes TLV . . . . . . . . . . . . . .  13
       2.3.4.  Source Router Identifier (Source Router-ID) TLV . . .  14
       2.3.5.  Range TLV . . . . . . . . . . . . . . . . . . . . . .  14
       2.3.6.  Binding SID TLV . . . . . . . . . . . . . . . . . . .  15
       2.3.7.  Binding SID SubTLVs . . . . . . . . . . . . . . . . .  16
     2.4.  Equivalent IS-IS Segment Routing TLVs/Sub-TLVs  . . . . .  22
     2.5.  Equivalent OSPF/OSPFv3 Segment Routing TLVs/Sub-TLVs  . .  23
   3.  Procedures  . . . . . . . . . . . . . . . . . . . . . . . . .  25
     3.1.  Advertisement of a IS-IS Prefix SID TLV . . . . . . . . .  25
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