Operations, Administration, and Maintenance Framework for MPLS-Based Transport Networks
RFC 6371

Internet Engineering Task Force (IETF)                      I. Busi, Ed.
Request for Comments: 6371                                Alcatel-Lucent
Category: Informational                                    D. Allan, Ed.
ISSN: 2070-1721                                                 Ericsson
                                                          September 2011

       Operations, Administration, and Maintenance Framework for
                     MPLS-Based Transport Networks

Abstract

   The Transport Profile of Multiprotocol Label Switching (MPLS-TP) is a
   packet-based transport technology based on the MPLS Traffic
   Engineering (MPLS-TE) and pseudowire (PW) data-plane architectures.

   This document describes a framework to support a comprehensive set of
   Operations, Administration, and Maintenance (OAM) procedures that
   fulfill the MPLS-TP OAM requirements for fault, performance, and
   protection-switching management and that do not rely on the presence
   of a control plane.

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

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 5741.

   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/rfc6371.

Busi & Allan                  Informational                     [Page 1]
RFC 6371         OAM Framework for MPLS-Based Transport   September 2011

Copyright Notice

   Copyright (c) 2011 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.

Table of Contents

   1. Introduction ....................................................3
   2. Conventions Used in This Document ...............................5
      2.1. Terminology ................................................5
      2.2. Definitions ................................................7
   3. Functional Components ..........................................10
      3.1. Maintenance Entity and Maintenance Entity Group ...........10
      3.2. MEG Nesting: SPMEs and Tandem Connection Monitoring .......13
      3.3. MEG End Points (MEPs) .....................................14
      3.4. MEG Intermediate Points (MIPs) ............................18
      3.5. Server MEPs ...............................................20
      3.6. Configuration Considerations ..............................21
      3.7. P2MP Considerations .......................................21
      3.8. Further Considerations of Enhanced Segment Monitoring .....22
   4. Reference Model ................................................23
      4.1. MPLS-TP Section Monitoring (SMEG) .........................26
      4.2. MPLS-TP LSP End-to-End Monitoring Group (LMEG) ............27
      4.3. MPLS-TP PW Monitoring (PMEG) ..............................27
      4.4. MPLS-TP LSP SPME Monitoring (LSMEG) .......................28
      4.5. MPLS-TP MS-PW SPME Monitoring (PSMEG) .....................30
      4.6. Fate-Sharing Considerations for Multilink .................31
   5. OAM Functions for Proactive Monitoring .........................32
      5.1. Continuity Check and Connectivity Verification ............33
           5.1.1. Defects Identified by CC-V .........................35
           5.1.2. Consequent Action ..................................37
           5.1.3. Configuration Considerations .......................38
      5.2. Remote Defect Indication ..................................40