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Mechanism for Performing Label Switched Path Ping (LSP Ping) over MPLS Tunnels (RFC6424) Disclosure Number: IPCOM000213113D
Original Publication Date: 2011-Nov-01
Included in the Prior Art Database: 2011-Dec-05
Document File: 46 page(s) / 48K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

N. Bahadur: AUTHOR [+2]


This documents describes methods for performing LSP ping (specified in [RFC4379]) traceroute over MPLS tunnels. The techniques in [RFC4379] outline a traceroute mechanism that includes Forwarding Equivalency Class (FEC) validation and Equal Cost Multi-Path (ECMP) path discovery. Those mechanisms are insufficient and do not provide details when the FEC being traced traverses one or more MPLS tunnels and when Label Switched Path (LSP) stitching [RFC5150] is in use. This document deprecates the Downstream Mapping TLV [RFC4379], introducing instead a new TLV that is more extensible and that enables retrieval of detailed information. Using the new TLV format along with the existing definitions of [RFC4379], this document describes procedures by which a traceroute request can correctly traverse MPLS tunnels with proper FEC and label validations.

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Internet Engineering Task Force (IETF)                        N. Bahadur Request for Comments: 6424                                   K. Kompella Updates: 4379                                     Juniper Networks, Inc. Category: Standards Track                                     G. Swallow ISSN: 2070-1721                                            Cisco Systems                                                            November 2011

       Mechanism for Performing Label Switched Path Ping (LSP Ping)                            over MPLS Tunnels


   This document describes methods for performing LSP ping (specified in    RFC 4379) traceroute over MPLS tunnels and for traceroute of stitched    MPLS Label Switched Paths (LSPs).  The techniques outlined in RFC    4379 are insufficient to perform traceroute Forwarding Equivalency    Class (FEC) validation and path discovery for an LSP that goes over    other MPLS tunnels or for a stitched LSP.  This document deprecates    the Downstream Mapping TLV (defined in RFC 4379) in favor of a new    TLV that, along with other procedures outlined in this document, can    be used to trace such LSPs.

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

Bahadur, et al.              Standards Track                    [Page 1]
 RFC 6424               LSP Ping over MPLS Tunnels          November 2011

 Copyright Notice

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