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Detecting Data-Plane Failures in Point-to-Multipoint MPLS - Extensions to LSP Ping
RFC 6425

Internet Engineering Task Force (IETF)                    S. Saxena, Ed.
Request for Comments: 6425                                    G. Swallow
Updates: 4379                                                     Z. Ali
Category: Standards Track                            Cisco Systems, Inc.
ISSN: 2070-1721                                                A. Farrel
                                                        Juniper Networks
                                                             S. Yasukawa
                                                         NTT Corporation
                                                               T. Nadeau
                                                         CA Technologies
                                                           November 2011

                    Detecting Data-Plane Failures in
           Point-to-Multipoint MPLS - Extensions to LSP Ping

Abstract

   Recent proposals have extended the scope of Multiprotocol Label
   Switching (MPLS) Label Switched Paths (LSPs) to encompass point-to-
   multipoint (P2MP) LSPs.

   The requirement for a simple and efficient mechanism that can be used
   to detect data-plane failures in point-to-point (P2P) MPLS LSPs has
   been recognized and has led to the development of techniques for
   fault detection and isolation commonly referred to as "LSP ping".

   The scope of this document is fault detection and isolation for P2MP
   MPLS LSPs.  This documents does not replace any of the mechanisms of
   LSP ping, but clarifies their applicability to MPLS P2MP LSPs, and
   extends the techniques and mechanisms of LSP ping to the MPLS P2MP
   environment.

   This document updates RFC 4379.

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/rfc6425.

Saxena, et al.               Standards Track                    [Page 1]
RFC 6425            P2MP MPLS Extensions to LSP PING       November 2011

Copyright Notice

   Copyright (c) 2011 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
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   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
      1.1. Design Considerations ......................................4
      1.2. Terminology ................................................4
   2. Notes on Motivation .............................................5
      2.1. Basic Motivations for LSP Ping .............................5
      2.2. Motivations for LSP Ping for P2MP LSPs .....................6
   3. Packet Format ...................................................7
      3.1. Identifying the LSP Under Test .............................8
           3.1.1. Identifying a P2MP MPLS TE LSP ......................8
                  3.1.1.1. RSVP P2MP IPv4 Session Sub-TLV .............8
                  3.1.1.2. RSVP P2MP IPv6 Session Sub-TLV .............9
           3.1.2. Identifying a Multicast LDP LSP .....................9
                  3.1.2.1. Multicast LDP FEC Stack Sub-TLVs ..........10
                  3.1.2.2. Applicability to

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