Fast Reroute Procedures for Associated Bidirectional Label Switched Paths (LSPs)
draft-ietf-teas-assoc-corouted-bidir-frr-01

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Replaces draft-gandhishah-teas-assoc-corouted-bidir
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TEAS Working Group                                        R. Gandhi, Ed.
Internet-Draft                                       Cisco Systems, Inc.
Intended Status: Standards Track                                 H. Shah
Expires: November 25, 2017                                         Ciena
                                                            J. Whittaker
                                                                 Verizon
                                                            May 24, 2017

                      Fast Reroute Procedures for 
          Associated Bidirectional Label Switched Paths (LSPs)
               draft-ietf-teas-assoc-corouted-bidir-frr-01

Abstract

   Resource Reservation Protocol (RSVP) association signaling can be
   used to bind two unidirectional LSPs into an associated bidirectional
   LSP.  When an associated bidirectional LSP is co-routed, the reverse
   LSP follows the same path as its forward LSP.  This document
   describes Fast Reroute (FRR) procedures for both single-sided and
   double-sided provisioned associated bidirectional LSPs.  The FRR
   procedures can ensure that for the co-routed LSPs, traffic flows on
   co-routed paths in the forward and reverse directions after a failure
   event.

Status of this Memo

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Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.
 

Gandhi, et al.         Expires November 25, 2017                [Page 1]
Internet-Draft   FRR For Associated Bidirectional LSPs      May 24, 2017

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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  Assumptions and Considerations . . . . . . . . . . . . . .  3
   2.  Conventions Used in This Document  . . . . . . . . . . . . . .  4
     2.1.  Key Word Definitions . . . . . . . . . . . . . . . . . . .  4
     2.2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  4
       2.2.1.  Forward Unidirectional LSPs  . . . . . . . . . . . . .  4
       2.2.2.  Reverse Co-routed Unidirectional LSPs  . . . . . . . .  4
   3.  Overview . . . . . . . . . . . . . . . . . . . . . . . . . . .  5
     3.1.  Fast Reroute Bypass Tunnel Assignment  . . . . . . . . . .  5
     3.2.  Node Protection Bypass Tunnels . . . . . . . . . . . . . .  6
     3.3.  Bidirectional LSP Association At Mid-Points  . . . . . . .  7
   4.  Signaling Procedure  . . . . . . . . . . . . . . . . . . . . .  8
     4.1.  Bidirectional LSP Fast Reroute . . . . . . . . . . . . . .  8
       4.1.1.  Re-corouting with Node Protection Bypass Tunnels . . .  9
       4.1.2.  Unidirectional Link Failures . . . . . . . . . . . . .  9
       4.1.3.  Revertive Behavior After Fast Reroute  . . . . . . . .  9
       4.1.4.  Bypass Tunnel Provisioning . . . . . . . . . . . . . . 10
     4.2.  Bidirectional LSP Association At Mid-points  . . . . . . . 10
   5.  Message and Object Definitions . . . . . . . . . . . . . . . . 10
     5.1.  Extended ASSOCIATION Object  . . . . . . . . . . . . . . . 10
   6.  Compatibility  . . . . . . . . . . . . . . . . . . . . . . . . 12
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . . 12
   8.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 12
   9.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 13
     9.1.  Normative References . . . . . . . . . . . . . . . . . . . 13
     9.2.  Informative References . . . . . . . . . . . . . . . . . . 13
   Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . . . 15
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 15

 

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