datatracker.ietf.org
Sign in
Version 5.3.0, 2014-04-12
Report a bug

Bidirectional Forwarding Detection (BFD) for MPLS Label Switched Paths (LSPs)
RFC 5884

Document type: RFC - Proposed Standard (June 2010)
Updates RFC 1122
Document stream: IETF
Last updated: 2013-03-02
Other versions: plain text, pdf, html

IETF State: (None)
Consensus: Unknown
Document shepherd: No shepherd assigned

IESG State: RFC 5884 (Proposed Standard)
Responsible AD: Ross Callon
Send notices to: bfd-chairs@tools.ietf.org, draft-ietf-bfd-mpls@tools.ietf.org

Internet Engineering Task Force (IETF)                       R. Aggarwal
Request for Comments: 5884                                   K. Kompella
Updates: 1122                                           Juniper Networks
Category: Standards Track                                      T. Nadeau
ISSN: 2070-1721                                                       BT
                                                              G. Swallow
                                                     Cisco Systems, Inc.
                                                               June 2010

                Bidirectional Forwarding Detection (BFD)
                  for MPLS Label Switched Paths (LSPs)

Abstract

   One desirable application of Bidirectional Forwarding Detection (BFD)
   is to detect a Multiprotocol Label Switching (MPLS) Label Switched
   Path (LSP) data plane failure.  LSP Ping is an existing mechanism for
   detecting MPLS data plane failures and for verifying the MPLS LSP
   data plane against the control plane.  BFD can be used for the
   former, but not for the latter.  However, the control plane
   processing required for BFD Control packets is relatively smaller
   than the processing required for LSP Ping messages.  A combination of
   LSP Ping and BFD can be used to provide faster data plane failure
   detection and/or make it possible to provide such detection on a
   greater number of LSPs.  This document describes the applicability of
   BFD in relation to LSP Ping for this application.  It also describes
   procedures for using BFD in this environment.

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/rfc5884.

Aggarwal, et al.             Standards Track                    [Page 1]
RFC 5884                    BFD for MPLS LSPs                  June 2010

Copyright Notice

   Copyright (c) 2010 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.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Table of Contents

   1. Introduction ....................................................3
   2. Specification of Requirements ...................................3
   3. Applicability ...................................................3
      3.1. BFD for MPLS LSPs: Motivation ..............................3
      3.2. Using BFD in Conjunction with LSP Ping .....................5
   4. Theory of Operation .............................................6
   5. Initialization and Demultiplexing ...............................7
   6. Session Establishment ...........................................7
      6.1. BFD Discriminator TLV in LSP Ping ..........................8
   7. Encapsulation ...................................................8
   8. Security Considerations .........................................9
   9. IANA Considerations ............................................10
   10. Acknowledgments ...............................................10
   11. References ....................................................10
      11.1. Normative References .....................................10

[include full document text]