Updates to the Fast Reroute Procedures for Co-routed Associated Bidirectional Label Switched Paths (LSPs)
draft-ietf-teas-assoc-corouted-bidir-frr-05

Document Type Active Internet-Draft (teas WG)
Last updated 2018-08-08
Replaces draft-gandhishah-teas-assoc-corouted-bidir
Stream IETF
Intended RFC status Proposed Standard
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TEAS Working Group                                        R. Gandhi, Ed.
Internet-Draft                                       Cisco Systems, Inc.
Updates: 4090, 7551                                              H. Shah
Intended Status: Standards Track                                   Ciena
Expires: February 9, 2019                                   J. Whittaker
                                                                 Verizon
                                                          August 8, 2018

                 Updates to the Fast Reroute Procedures for 
       Co-routed Associated Bidirectional Label Switched Paths (LSPs)
                draft-ietf-teas-assoc-corouted-bidir-frr-05

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 updates
   the Fast Reroute (FRR) procedures defined in RFC 4090 to support both
   single-sided and double-sided provisioned associated bidirectional
   LSPs.  This document also updates the procedure for associating two
   reverse LSPs defined in RFC 7551 to support co-routed 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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   provisions of BCP 78 and BCP 79.

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Copyright Notice

 

Gandhi, et al.          Expires February 9, 2019                [Page 1]
Internet-Draft   FRR For Associated Bidirectional LSPs    August 8, 2018

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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.  Problem Statement  . . . . . . . . . . . . . . . . . . . . . .  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.  Associated Bidirectional LSP Fast Reroute  . . . . . . . .  8
       4.1.1.  Restoring Co-routing with Node Protection Bypass
               Tunnels  . . . . . . . . . . . . . . . . . . . . . . .  9
       4.1.2.  Unidirectional Link Failures . . . . . . . . . . . . .  9
       4.1.3.  Revertive Behavior after Fast Reroute  . . . . . . . . 10
       4.1.4.  Bypass Tunnel Provisioning . . . . . . . . . . . . . . 10
       4.1.5.  One-to-One Bypass Tunnel . . . . . . . . . . . . . . . 10
     4.2.  Bidirectional LSP Association At Mid-points  . . . . . . . 10
   5.  Compatibility  . . . . . . . . . . . . . . . . . . . . . . . . 11
   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . 11
   7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 11
   Appendix A.  Extended ASSOCIATION ID . . . . . . . . . . . . . . . 11
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 14
     8.1.  Normative References . . . . . . . . . . . . . . . . . . . 14
     8.2.  Informative References . . . . . . . . . . . . . . . . . . 14
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