Fast Reroute Procedures for Co-routed Associated Bidirectional Label Switched Paths (LSPs)
draft-ietf-teas-assoc-corouted-bidir-frr-03

Document Type Active Internet-Draft (teas WG)
Last updated 2018-05-14
Replaces draft-gandhishah-teas-assoc-corouted-bidir
Stream IETF
Intended RFC status (None)
Formats plain text pdf html bibtex
Stream WG state WG Consensus: Waiting for Write-Up
Document shepherd No shepherd assigned
IESG IESG state I-D Exists
Consensus Boilerplate Unknown
Telechat date
Responsible AD (None)
Send notices to (None)
TEAS Working Group                                        R. Gandhi, Ed.
Internet-Draft                                       Cisco Systems, Inc.
Intended Status: Standards Track                                 H. Shah
Expires: November 15, 2018                                         Ciena
                                                            J. Whittaker
                                                                 Verizon
                                                            May 14, 2018

                         Fast Reroute Procedures for 
       Co-routed Associated Bidirectional Label Switched Paths (LSPs)
                draft-ietf-teas-assoc-corouted-bidir-frr-03

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

   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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.
 

Gandhi, et al.         Expires November 15, 2018                [Page 1]
Internet-Draft   FRR For Associated Bidirectional LSPs      May 14, 2018

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

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  . . . . . . . .  5
   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.  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  . . . . . . . 11
   5.  Message and Object Definitions . . . . . . . . . . . . . . . . 11
     5.1.  Extended ASSOCIATION ID  . . . . . . . . . . . . . . . . . 11
   6.  Compatibility  . . . . . . . . . . . . . . . . . . . . . . . . 13
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . . 13
   8.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 13
   9.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 14
     9.1.  Normative References . . . . . . . . . . . . . . . . . . . 14
     9.2.  Informative References . . . . . . . . . . . . . . . . . . 14
   Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . . . 16
Show full document text