Usage of the RSVP ASSOCIATION Object
RFC 6689

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Internet Engineering Task Force (IETF)                         L. Berger
Request for Comments: 6689                                          LabN
Category: Informational                                        July 2012
ISSN: 2070-1721

                  Usage of the RSVP ASSOCIATION Object

Abstract

   The Resource Reservation Protocol (RSVP) ASSOCIATION object is
   defined in the context of GMPLS-controlled label switched paths
   (LSPs).  In this context, the object is used to associate recovery
   LSPs with the LSP they are protecting.  This document reviews how the
   association is to be provided in the context of GMPLS recovery.  No
   new procedures or mechanisms are defined by this document, and it is
   strictly informative in nature.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see Section 2 of RFC 5741.

   Information about the current status of this document, any
   errata, and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc6689.

Copyright Notice

   Copyright (c) 2012 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   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.

Berger                        Informational                     [Page 1]
RFC 6689              RSVP ASSOCIATION Object Usage            July 2012

Table of Contents

   1. Introduction ....................................................2
   2. Background ......................................................2
      2.1. LSP Association ............................................3
      2.2. End-to-End Recovery LSP Association ........................4
      2.3. Segment Recovery LSP Association ...........................7
      2.4. Resource Sharing LSP Association ...........................8
   3. Association of GMPLS Recovery LSPs ..............................8
   4. Security Considerations ........................................10
   5. Acknowledgments ................................................10
   6. References .....................................................10
      6.1. Normative References ......................................10
      6.2. Informative References ....................................11

1.  Introduction

   End-to-end and segment recovery are defined for GMPLS-controlled
   label switched paths (LSPs) in [RFC4872] and [RFC4873], respectively.
   Both definitions use the ASSOCIATION object to associate recovery
   LSPs with the LSP they are protecting.  This document provides
   additional narrative on how such associations are to be identified.
   This document does not define any new procedures or mechanisms and is
   strictly informative in nature.

   It may not be immediately obvious to the informed reader why this
   document is necessary; however, questions were repeatedly raised in
   the Common Control and Measurement Plane (CCAMP) working group on the
   proper interpretation of the ASSOCIATION object in the context of
   end-to-end and segment recovery, and the working group agreed that
   this document should be produced in order to close the matter.  This
   document formalizes the explanation provided in an e-mail to the
   working group authored by Adrian Farrel, see [AF-EMAIL].  This
   document in no way modifies the normative definitions of end-to-end
   and segment recovery, see [RFC4872] or [RFC4873].

2.  Background

   This section reviews the definition of LSP association in the
   contexts of end-to-end and segment recovery as defined in [RFC4872]
   and [RFC4873].  This section merely reiterates what has been defined;
   if differences exist between this text and [RFC4872] or [RFC4873],
   the earlier RFCs provide the authoritative text.

Berger                        Informational                     [Page 2]
RFC 6689              RSVP ASSOCIATION Object Usage            July 2012

2.1.  LSP Association

   [RFC4872] introduces the concept and mechanisms to support the
   association of one LSP to another LSP across different RSVP - Traffic