Relayed Echo Reply Mechanism for Label Switched Path (LSP) Ping
RFC 7743

Document Type RFC - Proposed Standard (January 2016; No errata)
Updates RFC 4379
Last updated 2016-01-20
Replaces draft-zjns-mpls-lsp-ping-relay-reply
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Loa Andersson
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IESG IESG state RFC 7743 (Proposed Standard)
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IANA IANA review state Version Changed - Review Needed
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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

Abstract

   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
   http://www.rfc-editor.org/info/rfc7743.

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
   (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.

Table of Contents

   1. Introduction ....................................................3
      1.1. Conventions Used in This Document ..........................3
   2. Motivation ......................................................3
   3. Extensions ......................................................5
      3.1. Relayed Echo Reply Message .................................5
      3.2. Relay Node Address Stack ...................................6
      3.3. MTU Exceeded Return Code ...................................8
   4. Procedures ......................................................8
      4.1. Sending an Echo Request ....................................9
      4.2. Receiving an Echo Request ..................................9
      4.3. Originating a Relayed Echo Reply ..........................10
      4.4. Relaying a Relayed Echo Reply .............................11
      4.5. Sending an Echo Reply .....................................11
      4.6. Sending Subsequent Echo Requests ..........................12
      4.7. Impact on Traceroute ......................................12
   5. LSP Ping Relayed Echo Reply Example ............................13
   6. Security Considerations ........................................14
   7. Backward Compatibility .........................................15
   8. IANA Considerations ............................................15
      8.1. MPLS Relayed Echo Reply ...................................15
      8.2. Relay Node Address Stack TLV ..............................16
      8.3. MTU Exceeded Return Code ..................................16
   9. References .....................................................16
      9.1. Normative References ......................................16
      9.2. Informative References ....................................17
   Acknowledgements ..................................................17
   Contributors ......................................................17
   Authors' Addresses ................................................18
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