IS-IS Extensions for Segment Routing
draft-ietf-isis-segment-routing-extensions-11

Document Type Active Internet-Draft (isis WG)
Last updated 2017-04-03 (latest revision 2017-03-07)
Replaces draft-previdi-isis-segment-routing-extensions
Stream IETF
Intended RFC status Proposed Standard
Formats plain text pdf html bibtex
Stream WG state In WG Last Call
Document shepherd Christian Hopps
IESG IESG state I-D Exists
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Responsible AD (None)
Send notices to "Christian Hopps" <chopps@chopps.org>
IS-IS for IP Internets                                   S. Previdi, Ed.
Internet-Draft                                               C. Filsfils
Intended status: Standards Track                             A. Bashandy
Expires: September 8, 2017                           Cisco Systems, Inc.
                                                              H. Gredler
                                                            RtBrick Inc.
                                                            S. Litkowski
                                                             B. Decraene
                                                                  Orange
                                                             J. Tantsura
                                                              Individual
                                                           March 7, 2017

                  IS-IS Extensions for Segment Routing
             draft-ietf-isis-segment-routing-extensions-11

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 necessary IS-IS extensions that need to be
   introduced for Segment Routing operating on an MPLS data-plane.

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
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
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   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

Previdi, et al.         Expires September 8, 2017               [Page 1]
Internet-Draft    IS-IS Extensions for Segment Routing        March 2017

   This Internet-Draft will expire on September 8, 2017.

Copyright Notice

   Copyright (c) 2017 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
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Segment Routing Identifiers . . . . . . . . . . . . . . . . .   4
     2.1.  Prefix Segment Identifier (Prefix-SID Sub-TLV)  . . . . .   4
       2.1.1.  Flags . . . . . . . . . . . . . . . . . . . . . . . .   6
       2.1.2.  Prefix-SID Propagation  . . . . . . . . . . . . . . .   8
     2.2.  Adjacency Segment Identifier  . . . . . . . . . . . . . .   8
       2.2.1.  Adjacency Segment Identifier (Adj-SID) Sub-TLV  . . .   9
       2.2.2.  Adjacency Segment Identifiers in LANs . . . . . . . .  11
     2.3.  SID/Label Sub-TLV . . . . . . . . . . . . . . . . . . . .  13
     2.4.  SID/Label Binding TLV . . . . . . . . . . . . . . . . . .  14
       2.4.1.  Flags . . . . . . . . . . . . . . . . . . . . . . . .  15
       2.4.2.  Weight  . . . . . . . . . . . . . . . . . . . . . . .  16
       2.4.3.  Range . . . . . . . . . . . . . . . . . . . . . . . .  17
       2.4.4.  Prefix Length, Prefix . . . . . . . . . . . . . . . .  18
       2.4.5.  Mapping Server Prefix-SID . . . . . . . . . . . . . .  18
       2.4.6.  SID/Label Sub-TLV . . . . . . . . . . . . . . . . . .  20
       2.4.7.  ERO Metric sub-TLV  . . . . . . . . . . . . . . . . .  20
       2.4.8.  IPv4 ERO subTLV . . . . . . . . . . . . . . . . . . .  20
       2.4.9.  IPv6 ERO subTLV . . . . . . . . . . . . . . . . . . .  21
       2.4.10. Unnumbered Interface ID ERO subTLV  . . . . . . . . .  21
       2.4.11. IPv4 Backup ERO subTLV  . . . . . . . . . . . . . . .  22
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