Fast Reroute Procedures For Associated Bidirectional Label Switched Paths (LSPs)
draft-gandhishah-teas-assoc-corouted-bidir-04

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Last updated 2017-03-10
Replaces draft-gandhi-shah-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: September 11, 2017                                        Ciena
                                                        Jeremy Whittaker
                                                                 Verizon
                                                          March 10, 2017

      Fast Reroute Procedures For Associated Bidirectional Label 
                         Switched Paths (LSPs)
            draft-gandhishah-teas-assoc-corouted-bidir-04

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 are applicable to co-routed and non co-routed LSPs.  For
   co-routed LSPs, the FRR procedures can ensure that traffic flows on
   co-routed paths in the forward and reverse directions after a failure
   event.

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Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
 

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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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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Conventions Used in This Document  . . . . . . . . . . . . . .  3
     2.1.  Key Word Definitions . . . . . . . . . . . . . . . . . . .  3
     2.2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  3
       2.2.1.  Reverse Co-routed Unidirectional LSPs  . . . . . . . .  4
   3.  Overview . . . . . . . . . . . . . . . . . . . . . . . . . . .  4
     3.1.  Fast Reroute Bypass Tunnel Assignment  . . . . . . . . . .  4
     3.2.  Bidirectional LSP Association At Mid-Points  . . . . . . .  5
   4.  Signaling Procedure  . . . . . . . . . . . . . . . . . . . . .  6
     4.1.  Bidirectional LSP Fast Reroute . . . . . . . . . . . . . .  6
     4.2.  Bidirectional LSP Association At Mid-points  . . . . . . .  7
   5.  Message and Object Definitions . . . . . . . . . . . . . . . .  7
     5.1.  Extended ASSOCIATION Object  . . . . . . . . . . . . . . .  7
   6.  Compatibility  . . . . . . . . . . . . . . . . . . . . . . . .  8
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . .  9
   8.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  9
   9.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 10
     9.1.  Normative References . . . . . . . . . . . . . . . . . . . 10
     9.2.  Informative References . . . . . . . . . . . . . . . . . . 10
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 11

 

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1.  Introduction

   The Resource Reservation Protocol (RSVP) (Extended) ASSOCIATION
   Object is specified in [RFC6780] which can be used generically to
   associate (G)Multi-Protocol Label Switching (MPLS) Label Switched
   Paths (LSPs).  [RFC7551] defines mechanisms for binding two point-to-
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