IS-IS Extensions to Support Routing over IPv6 Dataplane
draft-bashandy-isis-srv6-extensions-03

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Networking Working Group                                L. Ginsberg, Ed.
Internet-Draft                                            P. Psenak, Ed.
Intended status: Standards Track                             C. Filsfils
Expires: December 31, 2018                                 Cisco Systems
                                                             A. Bashandy
                                                              Individual
                                                             B. Decraene
                                                                  Orange
                                                                   Z. Hu
                                                     Huawei Technologies
                                                           June 29, 2018

        IS-IS Extensions to Support Routing over IPv6 Dataplane
               draft-bashandy-isis-srv6-extensions-03.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", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

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 https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

Ginsberg, et al.        Expires December 31, 2018               [Page 1]
Internet-Draft     draft-bashandy-isis-srv6-extensions         June 2018

   This Internet-Draft will expire on December 31, 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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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  SRv6 Capabilities sub-TLV . . . . . . . . . . . . . . . . . .   3
   3.  Advertising Maximum SRv6 SID Depths . . . . . . . . . . . . .   4
     3.1.  Maximum Segments Left MSD Type  . . . . . . . . . . . . .   4
     3.2.  Maximum End Pop MSD Type  . . . . . . . . . . . . . . . .   5
     3.3.  Maximum T.Insert MSD Type . . . . . . . . . . . . . . . .   5
     3.4.  Maximum T.Encaps MSD Type . . . . . . . . . . . . . . . .   5
     3.5.  Maximum End D MSD Type  . . . . . . . . . . . . . . . . .   6
   4.  SRv6 SIDs and Reachability  . . . . . . . . . . . . . . . . .   6
   5.  Advertising Locators and End SIDs . . . . . . . . . . . . . .   7
     5.1.  SRv6 Locator TLV Format . . . . . . . . . . . . . . . . .   7
     5.2.  SRv6 End SID sub-TLV  . . . . . . . . . . . . . . . . . .   9
   6.  Advertising SRv6 End.X SIDs . . . . . . . . . . . . . . . . .  11
     6.1.  SRv6 End.X SID sub-TLV  . . . . . . . . . . . . . . . . .  11
     6.2.  SRv6 LAN End.X SID sub-TLV  . . . . . . . . . . . . . . .  13
   7.  Advertising Endpoint Function Types . . . . . . . . . . . . .  14
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  15
     8.1.  SRv6 Locator TLV  . . . . . . . . . . . . . . . . . . . .  15
       8.1.1.  SRv6 End SID sub-TLV  . . . . . . . . . . . . . . . .  16
       8.1.2.  Revised sub-TLV table . . . . . . . . . . . . . . . .  16
     8.2.  SRv6 Capabilities sub-TLV . . . . . . . . . . . . . . . .  16
     8.3.  SRv6 End.X SID and SRv6 LAN End.X SID sub-TLVs  . . . . .  17
     8.4.  MSD Types . . . . . . . . . . . . . . . . . . . . . . . .  17
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  18
   10. Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  18