UDP Return Path for Packet Loss and Delay Measurement for MPLS Networks
RFC 7876

Document Type RFC - Proposed Standard (July 2016; No errata)
Last updated 2016-07-26
Replaces draft-ietf-mpls-pm-udp-return
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Loa Andersson
Shepherd write-up Show (last changed 2015-10-21)
IESG IESG state RFC 7876 (Proposed Standard)
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Responsible AD Deborah Brungard
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IANA IANA review state Version Changed - Review Needed
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Internet Engineering Task Force (IETF)                         S. Bryant
Request for Comments: 7876                                   Independent
Category: Standards Track                                   S. Sivabalan
ISSN: 2070-1721                                                  S. Soni
                                                           Cisco Systems
                                                               July 2016

UDP Return Path for Packet Loss and Delay Measurement for MPLS Networks

Abstract

   RFC 6374 defines a protocol for Packet Loss and Delay Measurement for
   MPLS networks (MPLS-PLDM).  This document specifies the procedures to
   be used when sending and processing out-of-band MPLS performance
   management Responses over an UDP/IP return path.

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/rfc7876.

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.

Bryant, et al.               Standards Track                    [Page 1]
RFC 7876              UDP Return Path for MPLS-PLDM            July 2016

Table of Contents

   1. Introduction ....................................................3
   2. Requirements Language ...........................................3
   3. Solution Overview ...............................................3
      3.1. UDP Return Object ..........................................4
   4. Theory of Operation .............................................5
      4.1. Sending an MPLS-PLDM Query .................................5
      4.2. Receiving an MPLS-PLDM Query Request .......................5
      4.3. Sending an MPLS-PLDM Response ..............................6
      4.4. Receiving an MPLS-PLDM Response ............................7
   5. Congestion Considerations .......................................7
   6. Manageability Considerations ....................................8
   7. Security Considerations .........................................8
   8. IANA Considerations .............................................8
   9. References ......................................................9
      9.1. Normative References .......................................9
      9.2. Informative References .....................................9
   Acknowledgements ..................................................10
   Authors' Addresses ................................................10

Bryant, et al.               Standards Track                    [Page 2]
RFC 7876              UDP Return Path for MPLS-PLDM            July 2016

1.  Introduction

   This document describes how MPLS-PLDM [RFC6374] out-of-band Responses
   can be delivered to the querier using UDP/IP.

   The use of UDP may be required to support data-path management such
   as passage through firewalls or to provide the necessary multiplexing
   needed in bistatic operation where the querier and the collector are
   not co-located and the collector is gathering the Response
   information for a number of responders.  In a highly scaled system,
   some MPLS-PLDM sessions may be off-loaded to a specific node within
   the distributed system that comprises the Label Switching Router
   (LSR) as a whole.  In such systems, the Response may arrive via any
   interface in the LSR and needs to be forwarded internally to the
   processor tasked with handling the particular MPLS-PLDM measurement.
   Currently, the MPLS-PLDM protocol does not have any mechanism to
   deliver the PLDM Response message to a particular node within a
   multi-CPU LSR.

   The procedure described in this specification describes how the
   querier requests delivery of the MPLS-PLDM Response over IP to a
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