RSVP-TE Extensions for Associated Bidirectional Label Switched Paths (LSPs)
RFC 7551

Document Type RFC - Proposed Standard (May 2015; No errata)
Last updated 2015-10-14
Replaces draft-ietf-ccamp-mpls-tp-rsvpte-ext-associated-lsp
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Stream WG state Submitted to IESG for Publication Dec 2014
Document shepherd Deborah Brungard
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IESG IESG state RFC 7551 (Proposed Standard)
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Internet Engineering Task Force (IETF)                     F. Zhang, Ed.
Request for Comments: 7551                                        Huawei
Category: Standards Track                                        R. Jing
ISSN: 2070-1721                                            China Telecom
                                                          R. Gandhi, Ed.
                                                           Cisco Systems
                                                                May 2015

                           RSVP-TE Extensions
        for Associated Bidirectional Label Switched Paths (LSPs)

Abstract

   This document describes Resource Reservation Protocol (RSVP)
   extensions to bind two point-to-point unidirectional Label Switched
   Paths (LSPs) into an associated bidirectional LSP.  The association
   is achieved by defining new Association Types for use in ASSOCIATION
   and in Extended ASSOCIATION Objects.  One of these types enables
   independent provisioning of the associated bidirectional LSPs on both
   sides, while the other enables single-sided provisioning.  The
   REVERSE_LSP Object is also defined to enable a single endpoint to
   trigger creation of the reverse LSP and to specify parameters of the
   reverse LSP in the single-sided provisioning case.

Status of This Memo

   This is an Internet Standards Track document.

   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).  Further information on
   Internet Standards is available in 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/rfc7551.

Zhang, et al.                Standards Track                    [Page 1]
RFC 7551          RSVP-TE Extensions for Associated LSP         May 2015

Copyright Notice

   Copyright (c) 2015 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.

Zhang, et al.                Standards Track                    [Page 2]
RFC 7551          RSVP-TE Extensions for Associated LSP         May 2015

Table of Contents

   1. Introduction ....................................................4
   2. Conventions Used in This Document ...............................5
      2.1. Key Word Definitions .......................................5
      2.2. Reverse Unidirectional LSPs ................................5
      2.3. Message Formats ............................................5
   3. Overview ........................................................6
      3.1. Provisioning Model Overview ................................6
           3.1.1. Single-Sided Provisioning ...........................6
           3.1.2. Double-Sided Provisioning ...........................6
      3.2. Association Signaling Overview .............................6
           3.2.1. Single-Sided Provisioning ...........................7
           3.2.2. Double-Sided Provisioning ...........................7
      3.3. Asymmetric Bandwidth Signaling Overview ....................8
           3.3.1. Single-Sided Provisioning ...........................8
           3.3.2. Double-Sided Provisioning ...........................8
      3.4. Recovery LSP Overview ......................................8
   4. Message and Object Definitions ..................................9
      4.1. RSVP Message Formats .......................................9
      4.2. ASSOCIATION Object .........................................9
      4.3. Extended ASSOCIATION Object ...............................10
      4.4. REVERSE_LSP Object Definition .............................11
           4.4.1. REVERSE_LSP Object Format ..........................11
           4.4.2. REVERSE_LSP Subobjects .............................11
   5. Processing Rules ...............................................12
      5.1. Rules for ASSOCIATION Object ..............................12
           5.1.1. Compatibility for ASSOCIATION Object ...............14
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