Temporal and hitless path segment monitoring
draft-ietf-mpls-tp-temporal-hitless-psm-00

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Document Type Active Internet-Draft (mpls WG)
Last updated 2012-03-27
Replaces draft-koike-mpls-tp-temporal-hitless-psm
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MPLS Working Group                                     A. D'Alessandro
Internet Draft                                          Telecom Italia
                                                               M.Paul
                                                      Deutsche Telekom
Intended status: Informational                                S. Ueno
                                                    NTT Communications
                                                              Y.Koike
                                                                  NTT

Expires: September 25, 2012                             March 26, 2012

               Temporal and hitless path segment monitoring
              draft-ietf-mpls-tp-temporal-hitless-psm-00.txt

Status of this Memo

   This Internet-Draft is submitted to IETF in full conformance with the
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   This Internet-Draft will expire on September 25, 2012.

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   Copyright (c) 2011 IETF Trust and the persons identified as the
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   This document is subject to BCP 78 and the IETF Trust's Legal
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   (http://trustee.ietf.org/license-info) in effect on the date of

Koike                  Expires April 30, 2012                 [Page 1]
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Abstract

   The MPLS transport profile (MPLS-TP) is being standardized to enable
   carrier-grade packet transport and complement converged packet
   network deployments. Among the most attractive features of MPLS-TP
   are OAM functions, which enable network operators or service
   providers to provide various maintenance characteristics, such as
   fault location, survivability, performance monitoring, and
   preliminary or in-service measurements.

   One of the most important mechanisms which is common for transport
   network operation is fault location. A segment monitoring function of
   a transport path is effective in terms of extension of the
   maintenance work and indispensable particularly when the OAM function
   is effective only between end points. However, the current approach
   defined for MPLS-TP for the segment monitoring (SPME) has some fatal
   drawbacks.

   This document elaborates on the problem statement for the Sub-path
   Maintenance Elements (SPMEs) which provides monitoring of a portion
   of a set of transport paths (LSPs or MS-PWs). Based on the problems,
   this document specifies new requirements to consider a new improved
   mechanism of hitless transport path segment monitoring.

   This document is a product of a joint Internet Engineering Task Force
   (IETF) / International Telecommunications Union Telecommunications
   Standardization Sector (ITU-T) effort to include an MPLS Transport
   Profile within the IETF MPLS and PWE3 architectures to support the
   capabilities and functionalities of a packet transport network.

Table of Contents

   1. Introduction ................................................ 4
   2. Conventions used in this document............................ 4

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      2.1. Terminology ............................................ 5
      2.2. Definitions ............................................ 5
   3. Network objectives for monitoring............................ 5
   4. Problem statement ........................................... 5
   5. OAM functions using segment monitoring ....................... 9
   6. Further consideration of requirements for enhanced segment
   monitoring .................................................... 10
      6.1. Necessity of on-demand single-level monitoring.......... 10
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