Intermediate System to Intermediate System (IS-IS) Extensions for Maximally Redundant Trees (MRT)
draft-ietf-isis-mrt-03

Document Type Active Internet-Draft (isis WG)
Last updated 2017-06-30
Replaces draft-li-isis-mrt
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Network Working Group                                              Z. Li
Internet-Draft                                                     N. Wu
Intended status: Standards Track                                 Q. Zhao
Expires: January 1, 2018                             Huawei Technologies
                                                                A. Atlas
                                                               C. Bowers
                                                        Juniper Networks
                                                             J. Tantsura
                                                              Individual
                                                           June 30, 2017

   Intermediate System to Intermediate System (IS-IS) Extensions for
                    Maximally Redundant Trees (MRT)
                         draft-ietf-isis-mrt-03

Abstract

   This document describes extensions to IS-IS to support the
   distributed computation of Maximally Redundant Trees (MRT).  Example
   uses of MRT include IP/LDP Fast-Reroute and global protection or
   live-live for multicast traffic.  The extensions indicate what MRT
   profile(s) each router supports.  Different MRT profiles can be
   defined to support different uses and to allow transition of
   capabilities.  An extension is introduced to flood MRT-Ineligible
   links, due to administrative policy.  This document also defines the
   Controlled Convergence sub-TLV, which is useful for MRT FRR as well
   as other applications.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on January 1, 2018.

Li, et al.               Expires January 1, 2018                [Page 1]
Internet-Draft          IS-IS Extensions for MRT               June 2017

Copyright Notice

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   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.  Requirements Language . . . . . . . . . . . . . . . . . . . .   3
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Overview of IS-IS Signalling Extensions for MRT . . . . . . .   4
     4.1.  Supporting MRT Profiles . . . . . . . . . . . . . . . . .   4
     4.2.  Selecting the GADAG Root  . . . . . . . . . . . . . . . .   4
     4.3.  Advertising MRT-Ineligible Links for MRT  . . . . . . . .   5
     4.4.  Triggering an MRT Computation . . . . . . . . . . . . . .   5
   5.  MRT Capability Advertisement  . . . . . . . . . . . . . . . .   5
     5.1.  MRT Profile sub-TLV in the IS-IS Router CAPABILITY TLV  .   6
       5.1.1.  A note on the M-bit in OSPF . . . . . . . . . . . . .   7
     5.2.  MRT-Ineligible Link sub-TLV in the Extended IS
           Reachability TLV  . . . . . . . . . . . . . . . . . . . .   7
     5.3.  A Note on Multi-Topology Routing  . . . . . . . . . . . .   8
   6.  Controlled Convergence sub-TLV in IS-IS Router CAPABILITY TLV   8
   7.  Handling MRT Extensions . . . . . . . . . . . . . . . . . . .  10
     7.1.  Advertising MRT extensions  . . . . . . . . . . . . . . .  10
     7.2.  Processing MRT extensions . . . . . . . . . . . . . . . .  10
   8.  Backward Compatibility  . . . . . . . . . . . . . . . . . . .  10
   9.  Implementation Status . . . . . . . . . . . . . . . . . . . .  11
   10. Security Considerations . . . . . . . . . . . . . . . . . . .  11
   11. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  11
   12. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  11
     12.1.  MRT Profile and Controlled Convergence sub-TLVs  . . . .  11
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