Label Switched Path (LSP) Ping and Traceroute Reply Mode Simplification
RFC 7737

Document Type RFC - Proposed Standard (January 2016; No errata)
Updates RFC 7110
Last updated 2016-01-22
Replaces draft-akiya-mpls-lsp-ping-reply-mode-simple
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Ross Callon
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IESG IESG state RFC 7737 (Proposed Standard)
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IANA IANA review state Version Changed - Review Needed
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Internet Engineering Task Force (IETF)                          N. Akiya
Request for Comments: 7737                           Big Switch Networks
Updates: 7110                                                 G. Swallow
Category: Standards Track                                   C. Pignataro
ISSN: 2070-1721                                            Cisco Systems
                                                            L. Andersson
                                                                 M. Chen
                                                                  Huawei
                                                            January 2016

Label Switched Path (LSP) Ping and Traceroute Reply Mode Simplification

Abstract

   The Multiprotocol Label Switching (MPLS) Label Switched Path (LSP)
   Ping and Traceroute use the Reply Mode field to signal the method to
   be used in the MPLS echo reply.  This document updates the procedures
   for the "Reply via Specified Path" Reply Mode.  The value of this
   Reply Mode is 5.  The update creates a simple way to indicate that
   the reverse LSP should be used as the return path.  This document
   also adds an optional TLV that can carry an ordered list of Reply
   Mode values.

   This document updates RFC 7110.

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/rfc7737.

Akiya, et al.                Standards Track                    [Page 1]
RFC 7737           LSP Ping Reply Mode Simplification       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.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   2.  Problem Statements  . . . . . . . . . . . . . . . . . . . . .   4
   3.  Solution  . . . . . . . . . . . . . . . . . . . . . . . . . .   5
     3.1.  "Reply via Specified Path" Reply Mode Update  . . . . . .   5
     3.2.  Reply Mode Order TLV  . . . . . . . . . . . . . . . . . .   6
   4.  Relationships to Other LSP Ping and Traceroute Features . . .   8
     4.1.  Backwards Compatibility with "Reply via Specified Path"
           Reply Mode  . . . . . . . . . . . . . . . . . . . . . . .   8
     4.2.  Reply Path TLV  . . . . . . . . . . . . . . . . . . . . .   8
       4.2.1.  Example 1: Reply Mode Order TLV Usage with Reply Path
               TLV . . . . . . . . . . . . . . . . . . . . . . . . .   9
       4.2.2.  Example 2: Reply Mode Order TLV Usage with Reply Path
               TLV . . . . . . . . . . . . . . . . . . . . . . . . .  10
     4.3.  Proxy LSP Ping  . . . . . . . . . . . . . . . . . . . . .  10
       4.3.1.  Proxy LSR Sending an MPLS Echo Request  . . . . . . .  10
       4.3.2.  Proxy LSR Sending an MPLS Proxy Ping Reply  . . . . .  11
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
   6.  Manageability Considerations  . . . . . . . . . . . . . . . .  11
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
     7.1.  New Reply Mode Order TLV  . . . . . . . . . . . . . . . .  12
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  12
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  13
   Appendix A.  Reply Mode Order TLV Beneficial Scenarios  . . . . .  14
     A.1.  Incorrect Forwarding Scenario . . . . . . . . . . . . . .  14
     A.2.  Non-Co-Routed Bidirectional LSP Scenario  . . . . . . . .  15
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  16
   Contributors  . . . . . . . . . . . . . . . . . . . . . . . . . .  16
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