IS-IS Extensions to Support Routing over IPv6 Dataplane
draft-bashandy-isis-srv6-extensions-01

Document Type Active Internet-Draft (individual)
Last updated 2017-09-29
Replaces draft-previdi-isis-ipv6-prefix-sid
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Networking Working Group                                     L. Ginsberg
Internet-Draft                                               A. Bashandy
Intended status: Standards Track                             C. Filsfils
Expires: April 2, 2018                                     Cisco Systems
                                                             B. Decraene
                                                                  Orange
                                                      September 29, 2017

        IS-IS Extensions to Support Routing over IPv6 Dataplane
               draft-bashandy-isis-srv6-extensions-01.txt

Abstract

   Segment Routing (SR) allows for a flexible definition of end-to-end
   paths by encoding paths as sequences of topological sub-paths, called
   "segments".  Segment routing architecture can be implemented over an
   MPLS data plane as well as an IPv6 data plane.  This draft describes
   the IS-IS extensions required to support Segment Routing over an IPv6
   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
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   This Internet-Draft will expire on April 2, 2018.

Ginsberg, et al.          Expires April 2, 2018                 [Page 1]
Internet-Draft     draft-bashandy-isis-srv6-extensions    September 2017

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  SRv6-Capabilities sub-TLV . . . . . . . . . . . . . . . . . .   3
     2.1.  Maximum SL sub-sub-TLV  . . . . . . . . . . . . . . . . .   4
     2.2.  Maximum End Pop SRH sub-sub-TLV . . . . . . . . . . . . .   5
     2.3.  Maximum T.Insert SRH sub-sub-TLV  . . . . . . . . . . . .   5
     2.4.  Maximum T.Encap SRH sub-sub-TLV . . . . . . . . . . . . .   5
     2.5.  Maximum End D SRH sub-sub-TLV . . . . . . . . . . . . . .   6
   3.  SRv6-function Descriptor  . . . . . . . . . . . . . . . . . .   6
   4.  SRv6-SID TLV  . . . . . . . . . . . . . . . . . . . . . . . .   9
   5.  Function Code Points  . . . . . . . . . . . . . . . . . . . .  11
   6.  Advertising SRv6 SIDs associated with a Neighbor  . . . . . .  11
     6.1.  P2P Srv6 X-SID sub-TLV  . . . . . . . . . . . . . . . . .  11
     6.2.  LAN SRv6 X-SID sub-TLV  . . . . . . . . . . . . . . . . .  12
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
     7.1.  SRv6 SID TLV and sub-TLVs . . . . . . . . . . . . . . . .  14
     7.2.  IS-IS SRv6-functions Codepoints Registry  . . . . . . . .  14
     7.3.  SRv6 Capabilities sub-TLV . . . . . . . . . . . . . . . .  15
     7.4.  P2P SRv6 X-SID and LAN SRv6 X-SID sub-TLVs  . . . . . . .  15
     7.5.  IS-IS SRv6 X-SID sub-sub-TLV Codepoints Registry  . . . .  16
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  16
   9.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  16
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  17
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  18
     10.2.  Informative References . . . . . . . . . . . . . . . . .  18
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  18

1.  Introduction

   With Segment Routing (SR)[SRARCH], a node steers a packet through an
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