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Relayed Echo Reply Mechanism for Label Switched Path (LSP) Ping (RFC7743) Disclosure Number: IPCOM000245091D
Original Publication Date: 2016-Jan-01
Included in the Prior Art Database: 2016-Feb-08
Document File: 36 page(s) / 39K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

J. Luo: AUTHOR [+7]


This document describes extensions to the Label Switched Path (LSP) Ping specified in [RFC4379] by adding a Relayed Echo Reply mechanism that could be used to report data-plane failures for inter-AS (Autonomous System) and inter-area LSPs. Without these extensions, the ping functionality provided by [RFC4379] would fail in many deployed inter-AS scenarios, since the replying Label Switching Router (LSR) in one AS may not have an available route to the initiator in the other AS. The mechanism in this document defines a new Message Type referred to as the "Relayed Echo Reply message" and a new TLV referred to as the "Relay Node Address Stack TLV".

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Internet Engineering Task Force (IETF)                       J. Luo, Ed. Request for Comments: 7743                                           ZTE Updates: 4379                                                L. Jin, Ed. Category: Standards Track ISSN: 2070-1721                                           T. Nadeau, Ed.                                                                  Brocade                                                          G. Swallow, Ed.                                                                    Cisco                                                             January 2016

     Relayed Echo Reply Mechanism for Label Switched Path (LSP) Ping


   In some inter-AS (Autonomous System) and inter-area deployment    scenarios for RFC 4379 ("Label Switched Path (LSP) Ping and    Traceroute"), a replying Label Switching Router (LSR) may not have    the available route to an initiator, and the Echo Reply message sent    to the initiator would be discarded, resulting in false negatives or    a complete failure of operation of the LSP Ping and Traceroute.  This    document describes extensions to the LSP Ping mechanism to enable the    replying LSR to have the capability to relay the Echo Response by a    set of routable intermediate nodes to the initiator.  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

 Luo, et al.                  Standards Track                    [Page 1]
 RFC 7743            MPLS LSP Ping Relayed Echo Reply        January 2016

 Copyright Notice

   Copyright (c) 2016 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    ( in effect on the date of

   publication of this document.  Please review these documents    carefully, as they...