Detecting Multiprotocol Label Switched (MPLS) Data-Plane Failures
RFC 8029

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Internet Engineering Task Force (IETF)                       K. Kompella
Request for Comments: 8029                        Juniper Networks, Inc.
Obsoletes: 4379, 6424, 6829, 7537                             G. Swallow
Updates: 1122                                          C. Pignataro, Ed.
Category: Standards Track                                       N. Kumar
ISSN: 2070-1721                                                    Cisco
                                                               S. Aldrin
                                                                  Google
                                                                 M. Chen
                                                                  Huawei
                                                              March 2017

   Detecting Multiprotocol Label Switched (MPLS) Data-Plane Failures

Abstract

   This document describes a simple and efficient mechanism to detect
   data-plane failures in Multiprotocol Label Switching (MPLS) Label
   Switched Paths (LSPs).  It defines a probe message called an "MPLS
   echo request" and a response message called an "MPLS echo reply" for
   returning the result of the probe.  The MPLS echo request is intended
   to contain sufficient information to check correct operation of the
   data plane and to verify the data plane against the control plane,
   thereby localizing faults.

   This document obsoletes RFCs 4379, 6424, 6829, and 7537, and updates
   RFC 1122.

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 7841.

   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/rfc8029.

Kompella, et al.             Standards Track                    [Page 1]
RFC 8029           Detecting MPLS Data-Plane Failures         March 2017

Copyright Notice

   Copyright (c) 2017 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
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   described in the Simplified BSD License.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Kompella, et al.             Standards Track                    [Page 2]
RFC 8029           Detecting MPLS Data-Plane Failures         March 2017

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   5
     1.1.  Conventions . . . . . . . . . . . . . . . . . . . . . . .   5
     1.2.  Structure of This Document  . . . . . . . . . . . . . . .   6
     1.3.  Scope of This Specification . . . . . . . . . . . . . . .   6
   2.  Motivation  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     2.1.  Use of Address Range 127/8  . . . . . . . . . . . . . . .   8
     2.2.  Router Alert Option . . . . . . . . . . . . . . . . . . .  10
   3.  Packet Format . . . . . . . . . . . . . . . . . . . . . . . .  11
     3.1.  Return Codes  . . . . . . . . . . . . . . . . . . . . . .  16
     3.2.  Target FEC Stack  . . . . . . . . . . . . . . . . . . . .  17
       3.2.1.  LDP IPv4 Prefix . . . . . . . . . . . . . . . . . . .  19
       3.2.2.  LDP IPv6 Prefix . . . . . . . . . . . . . . . . . . .  19
       3.2.3.  RSVP IPv4 LSP . . . . . . . . . . . . . . . . . . . .  20
       3.2.4.  RSVP IPv6 LSP . . . . . . . . . . . . . . . . . . . .  20
       3.2.5.  VPN IPv4 Prefix . . . . . . . . . . . . . . . . . . .  21
       3.2.6.  VPN IPv6 Prefix . . . . . . . . . . . . . . . . . . .  22