IS-IS Extension to Support Segment Routing over IPv6 Dataplane
draft-ietf-lsr-isis-srv6-extensions-02

Document Type Active Internet-Draft (lsr WG)
Last updated 2019-09-03 (latest revision 2019-07-04)
Replaces draft-bashandy-isis-srv6-extensions
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Networking Working Group                                  P. Psenak, Ed.
Internet-Draft                                               C. Filsfils
Intended status: Standards Track                           Cisco Systems
Expires: January 5, 2020                                     A. Bashandy
                                                                  Arrcus
                                                             B. Decraene
                                                                  Orange
                                                                   Z. Hu
                                                     Huawei Technologies
                                                            July 4, 2019

     IS-IS Extension to Support Segment Routing over IPv6 Dataplane
               draft-ietf-lsr-isis-srv6-extensions-02.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
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   This Internet-Draft will expire on January 5, 2020.

Psenak, et al.           Expires January 5, 2020                [Page 1]
Internet-Draft     draft-bashandy-isis-srv6-extensions         July 2019

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  SRv6 Capabilities sub-TLV . . . . . . . . . . . . . . . . . .   4
   3.  Advertising Supported Algorithms  . . . . . . . . . . . . . .   4
   4.  Advertising Maximum SRv6 SID Depths . . . . . . . . . . . . .   4
     4.1.  Maximum Segments Left MSD Type  . . . . . . . . . . . . .   5
     4.2.  Maximum End Pop MSD Type  . . . . . . . . . . . . . . . .   5
     4.3.  Maximum T.Insert MSD Type . . . . . . . . . . . . . . . .   5
     4.4.  Maximum T.Encaps MSD Type . . . . . . . . . . . . . . . .   5
     4.5.  Maximum End D MSD Type  . . . . . . . . . . . . . . . . .   6
   5.  SRv6 SIDs and Reachability  . . . . . . . . . . . . . . . . .   6
   6.  Advertising Locators and End SIDs . . . . . . . . . . . . . .   8
     6.1.  SRv6 Locator TLV Format . . . . . . . . . . . . . . . . .   8
     6.2.  SRv6 End SID sub-TLV  . . . . . . . . . . . . . . . . . .   9
   7.  Advertising SRv6 Adjacency SIDs . . . . . . . . . . . . . . .  11
     7.1.  SRv6 End.X SID sub-TLV  . . . . . . . . . . . . . . . . .  11
     7.2.  SRv6 LAN End.X SID sub-TLV  . . . . . . . . . . . . . . .  13
   8.  SRv6 SID Structure Sub-Sub-TLV  . . . . . . . . . . . . . . .  14
   9.  Advertising Endpoint Behaviors  . . . . . . . . . . . . . . .  15
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  16
     10.1.  SRv6 Locator TLV . . . . . . . . . . . . . . . . . . . .  16
       10.1.1.  SRv6 End SID sub-TLV . . . . . . . . . . . . . . . .  16
       10.1.2.  Revised sub-TLV table  . . . . . . . . . . . . . . .  17
     10.2.  SRv6 Capabilities sub-TLV  . . . . . . . . . . . . . . .  17
     10.3.  SRv6 End.X SID and SRv6 LAN End.X SID sub-TLVs . . . . .  18
     10.4.  MSD Types  . . . . . . . . . . . . . . . . . . . . . . .  18
     10.5.  Sub-Sub-TLVs for SID Sub-TLVs  . . . . . . . . . . . . .  18
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