Requirements for Hitless MPLS Path Segment Monitoring
RFC 8256

Document Type RFC - Informational (October 2017; No errata)
Last updated 2017-10-26
Replaces draft-koike-mpls-tp-temporal-hitless-psm
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Document shepherd David Sinicrope
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IESG IESG state RFC 8256 (Informational)
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Send notices to draft-ietf-mpls-tp-temporal-hitless-psm@ietf.org, "David Sinicrope" <david.sinicrope@ericsson.com>
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IANA action state No IC
Internet Engineering Task Force (IETF)                   A. D'Alessandro
Request for Comments: 8256                                Telecom Italia
Category: Informational                                     L. Andersson
ISSN: 2070-1721                                      Huawei Technologies
                                                                 S. Ueno
                                                      NTT Communications
                                                                 K. Arai
                                                                Y. Koike
                                                                     NTT
                                                            October 2017

         Requirements for Hitless MPLS Path Segment Monitoring

Abstract

   One of the most important Operations, Administration, and Maintenance
   (OAM) capabilities for transport-network operation is fault
   localization.  An in-service, on-demand path segment monitoring
   function of a transport path is indispensable, particularly when the
   service monitoring function is activated only between endpoints.
   However, the current segment monitoring approach defined for MPLS
   (including the MPLS Transport Profile (MPLS-TP)) in RFC 6371
   "Operations, Administration, and Maintenance Framework for MPLS-Based
   Transport Networks" has drawbacks.  This document provides an
   analysis of the existing MPLS-TP OAM mechanisms for the path segment
   monitoring and provides requirements to guide the development of new
   OAM tools to support Hitless Path Segment Monitoring (HPSM).

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   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).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see 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
   https://www.rfc-editor.org/info/rfc8256.

D'Alessandro, et al.          Informational                     [Page 1]
RFC 8256             Hitless Path Segment Monitoring        October 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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Conventions Used in This Document . . . . . . . . . . . . . .   3
     2.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Problem Statement . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Requirements for HPSM . . . . . . . . . . . . . . . . . . . .   8
     4.1.  Backward Compatibility  . . . . . . . . . . . . . . . . .   8
     4.2.  Non-Intrusive Segment Monitoring  . . . . . . . . . . . .   8
     4.3.  Monitoring Multiple Segments  . . . . . . . . . . . . . .   9
     4.4.  Monitoring Single and Multiple Levels . . . . . . . . . .   9
     4.5.  HPSM and End-to-End Proactive Monitoring Independence . .  10
     4.6.  Monitoring an Arbitrary Segment . . . . . . . . . . . . .  10
     4.7.  Fault while HPSM Is Operational . . . . . . . . . . . . .  11
     4.8.  HPSM Manageability  . . . . . . . . . . . . . . . . . . .  13
     4.9.  Supported OAM Functions . . . . . . . . . . . . . . . . .  13
   5.  Summary . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  14
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  15
   Contributors  . . . . . . . . . . . . . . . . . . . . . . . . . .  15
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  15
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  16
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