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Definition of Time to Live TLV for LSP-Ping Mechanisms (RFC7394) Disclosure Number: IPCOM000239559D
Original Publication Date: 2014-Nov-01
Included in the Prior Art Database: 2014-Nov-15
Document File: 16 page(s) / 15K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

S. Boutros: AUTHOR [+5]


An MS-PW may span across multiple service provider networks. In order to allow Service Providers (SPs) to verify segments of such MS-PWs from any node on the path of the MS-PW, any node along the path of the MS-PW, should be able to originate an MPLS Echo Request packet to any other node along the path of the MS-PW and receive the corresponding MPLS Echo Reply. If the originator of the MPLS Echo Request is at the end of a MS-PW, the receiver of the request can send the reply back to the sender without knowing the hop-count distance of the originator. The reply will be intercepted by the originator regardless of the TTL value on the reply packet. But, if the originator is not at the end of the MS-PW, the receiver of the MPLS Echo Request may need to know how many hops away the originator

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Internet Engineering Task Force (IETF)                        S. Boutros Request for Comments: 7394                                  S. Sivabalan Category: Standards Track                                     G. Swallow ISSN: 2070-1721                                                S. Saxena                                                            Cisco Systems                                                                V. Manral                                                           Ionos Networks                                                                S. Aldrin                                                Huawei Technologies, Inc.                                                            November 2014

          Definition of Time to Live TLV for LSP-Ping Mechanisms


   LSP-Ping is a widely deployed Operation, Administration, and    Maintenance (OAM) mechanism in MPLS networks.  However, in the    present form, this mechanism is inadequate to verify connectivity of    a segment of a Multi-Segment Pseudowire (MS-PW) and/or bidirectional    co-routed Label Switched Path (LSP) from any node on the path of the    MS-PW and/or bidirectional co-routed LSP.  This document defines a    TLV to address this shortcoming.

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

 Boutros, et al.              Standards Track                    [Page 1]
 RFC 7394             TTL TLV for LSP-Ping Mechanisms       November 2014

 Copyright Notice

   Copyright (c) 2014 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 desc...