MPLS Performance Measurement UDP Return Path
draft-bryant-mpls-oam-udp-return-00

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Last updated 2014-04-07
Replaced by draft-ietf-mpls-pm-udp-return
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MPLS                                                           S. Bryant
Internet-Draft                                              S. Sivabalan
Intended status: Standards Track                                 S. Soni
Expires: October 9, 2014                                   Cisco Systems
                                                           April 7, 2014

              MPLS Performance Measurement UDP Return Path
                  draft-bryant-mpls-oam-udp-return-00

Abstract

   This document specifies an extension to the protocol for making
   performance measurements of MPLS LSPs that is defined in RFC6374.  It
   specifies the procedure used for sending and processing MPLS
   performance management out-of-band responses for delay and loss
   measurements over an IP/UDP return path.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   This Internet-Draft will expire on October 9, 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
   (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

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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

1.  Introduction

   [RFC6374] does not define how an MPLS performance measurement (PM)
   out-of-band response delivered over IP will be transmitted to the
   Querier.

   In a highly scaled system some PM sessions may be off-loaded to a
   specific node within a the distributed system that comprises the LSR
   as a whole.  In such systems the response may arrive via any
   interface in the LSR and need to internally forwarded to the
   processor tasked with handling the particular PM measurement.
   Currently the MPLS PM protocol does not have any mechanism to deliver
   the PM Response message to particular node within a multi-CPU LSR.

   The procedure described in this specification shows how to deliver
   the response over a dynamic UDP port.

2.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

3.  Solution Overview

   This document specifies that, unless configured otherwise, the
   "Return Address TLV" defined in [RFC6374] SHALL be used to carry the
   return address.  It also defines "Return UDP Port" TLV which, unless
   configured otherwise SHALL be used to carry the return UDP port.  The
   Return Address TLV and the Return UDP PORT TLV carried in the MPLS-PM
   query message are used to specify to the Responder how to return the
   response message.

   The procedures defined in this document may be applied to both
   unidirectional tunnels and Bidirectional LSPs.  In this document, the
   term bidirectional LSP includes the co-routed Bidirectional LSP
   defined in [RFC3945] and the associated bidirectional LSP that is
   constructed from a pair of unidirectional LSPs (one for each
   direction) that are associated with one another at the LSP's ingress/
   egress points [RFC5654].  The mechanisms defined in this document can
   apply to both IP/MPLS and the MPLS Transport Profile (MPLS-TP).

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3.1.  Return UDP Port TLV

   The format of the Return UDP TLV is as follows:

       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | UDP TLV Type  |     Length    |        UDP Dest Port          |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   The UDP TLV Type has a value of <TBD>.
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