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Versions: (draft-farrel-mpls-tp-mib-management-overview) 00 01 02 03 04 05 06 07 08 RFC 6639

Network Working Group                                   D. King (Editor)
Internet-Draft                                        Old Dog Consulting
Intended status: Informational                    M. Venkatesan (Editor)
Expires: November 12, 2011                                       Aricent
                                                           June 12, 2011


        Multiprotocol Label Switching Transport Profile (MPLS-TP)
                       MIB-based Management Overview
             draft-ietf-mpls-tp-mib-management-overview-04.txt

Abstract

   A range of Management Information Base (MIB) modules has been
   developed to help model and manage the various aspects of
   Multiprotocol Label Switching (MPLS) networks.  These MIB modules are
   defined in separate documents that focus on the specific areas of
   responsibility of the modules that they describe.

   The MPLS Transport Profile (MPLS-TP) is a profile of MPLS
   functionality specific to the construction of packet-switched
   transport networks.

   This document describes the MIB-based architecture for MPLS-TP,
   and indicates the interrelationships between different existing MIB
   modules that can be leveraged for MPLS-TP network management and
   identifies areas where additional MIB modules would be required.


Status of this Memo

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

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups.  Note that
   other groups may also distribute working documents as Internet-
   Drafts.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   The list of current Internet-Drafts can be accessed at
   http://www.ietf.org/ietf/1id-abstracts.txt.

   The list of Internet-Draft Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html.

   This Internet-Draft will expire on June 12, 2011.


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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
   1.1 MPLS-TP Management Function.................................4
   2. Terminology..................................................4
   3. The SNMP Management Framework................................4
   4. Overview of Existing Work....................................5
      4.1. MPLS Management Overview and Requirements...............5
      4.2. An Introduction to the MPLS and Pseudowire MIB Modules..5
           4.2.1. Structure of the MPLS MIB OID Tree...............5
           4.2.2. Textual Convention Modules.......................6
           4.2.3. Label Edge Router (LER) Modules..................7
           4.2.4. Label Switching Router Modules...................7
           4.2.5. Label Switched Path Modules......................7
           4.2.6. Pseudowire Modules...............................8
           4.2.7. Routing and Traffic Engineering..................9
           4.2.8. Resiliency.......................................9
           4.2.9. Fault Management and Performance Management......10
           4.2.10. MIB Module Interdependencies....................11
           4.2.11. Dependencies on External MIB Modules............13
   5. Applicability of MPLS MIB modules to MPLS-TP.................14
      5.1 MPLS-TP Tunnel...........................................14
          5.1.1 Gap Analysis.......................................14
          5.1.2 Recommendations....................................15
      5.2 MPLS-TP Pseudowire.......................................15
          5.2.1 Gap Analysis.......................................15
          5.2.2 Recommendations....................................15
      5.3 MPLS-TP Sections.........................................15
          5.3.1 Gap Analysis.......................................15
          5.3.2 Recommendations....................................15
      5.4 MPLS-TP OAM..............................................16
          5.4.1 Gap Analysis.......................................16
          5.4.2 Recommendations....................................16



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      5.5 MPLS-TP Protection Switching and Recovery................16
          5.5.1 Gap Analysis.......................................16
          5.5.2 Recommendations....................................16
      5.6 MPLS-TP Interfaces.......................................16
          5.6.1 Gap Analysis.......................................16
          5.6.2 Recommendations....................................17
   6. An Introduction to the MPLS-TP MIB Modules...................17
      6.1 MPLS-TP MIB Modules......................................17
           6.1.1 Structure of the MPLS-TP MIB OID Tree.............17
           6.1.2 Textual Conventions for MPLS-TP...................18
           6.1.3 Identifiers for MPLS-TP...........................18
           6.1.4 LSR MIB Extensions for MPLS-TP....................18
           6.1.5 Tunnel Extensions for MPLS-TP.....................18
      6.2 PWE3 MIB Modules for MPLS-TP.............................18
           6.2.1 Structure of the PWE3 MIB OID Tree for MPLS-TP....19
           6.2.2 Pseudowire Textual Conventions for MPLS-TP........19
           6.2.3 Pseudowire Extensions for MPLS-TP.................19
           6.2.4 Pseudowire MPLS Extensions for MPLS-TP............19
      6.3 OAM MIB Modules for MPLS-TP..............................19
           6.3.1 Structure of the OAM MIB OID Tree for MPLS-TP.....19
           6.3.2 LSP Ping MIB module...............................20
           6.3.3 BFD MIB module....................................20
           6.3.4 Common OAM MIB modules............................20
      6.4. Protection Switching and Recovery MIB Modules
           for MPLS-TP.............................................20
           6.4.1 Structure of the Protection Switching
                 and Recovery MIB OID Tree for MPLS-TP.............21
           6.4.2 Linear Protection Switching MIB module............21
           6.4.3 Ring Protection Switching MIB module..............21
           6.4.4 Mesh Protection Switching MIB module..............21
   7. Management Options...........................................21
   8. Security Considerations......................................21
   9. IANA Considerations..........................................22
   10. Acknowledgements............................................22
   11. References..................................................22
      11.1. Normative References...................................22
      11.2. Informational References...............................24
   12. Authors' Addresses..........................................26


1. Introduction

   The MPLS Transport Profile (MPLS-TP) is a packet transport
   technology based on a profile of the MPLS functionality specific
   to the construction of packet-switched transport networks.
   MPLS is described in [RFC3031] and requirements for MPLS-TP are
   specified in [RFC5654].




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   A range of Management Information Base (MIB) modules has been
   developed to help model and manage the various aspects of
   Multiprotocol Label Switching (MPLS) networks. These MIB modules
   are defined in separate documents that focus on the specific areas of
   responsibility of the modules that they describe.

   An MPLS-TP network can be operated via static provisioning of
   transport paths, or the elective use of a Generalized MPLS (GMPLS)
   control plane to support dynamic provisioning of transport paths.

   This document describes the MIB-based management architecture for
   MPLS-TP and indicates the interrelationships between different
   existing MIB modules that should be leveraged for MPLS-TP network
   management, if SNMP is used for the management interface and
   identifies areas where additional MIB modules would be required. Note
   that [RFC5951] does not specify a preferred management interface
   protocol to be used as the standard protocol for managing MPLS-TP
   networks.

1.1 MPLS-TP Management Function

   The management of the MPLS-TP networks is inseparable from that of
   its client networks so that the same means of management can be used
   regardless of the client. The management functions of MPLS-TP
   includes fault management, configuration management, performance
   monitoring, and security management.

   The purpose of the management function is to provide control and
   monitoring over the protocol mechanisms and procedures that
   constitute the building blocks for a transport profile of MPLS.
   The requirements for the network management functionality are
   found in [RFC5951].  A description of the network and element
   management architectures that can be applied to the management
   of MPLS-based transport networks is found in [RFC5950].


2. Terminology

   This document also uses terminology from the MPLS architecture
   document [RFC3031] and the following MPLS related MIB modules:
   MPLS TC MIB [RFC3811], MPLS LSR MIB [RFC3813], MPLS TE MIB [RFC3812],
   MPLS LDP MIB [RFC3815], MPLS FTN MIB [RFC3814] and TE LINK MIB
   [RFC4220].


3. The SNMP Management Framework

   Managed objects are accessed via a virtual information store, termed
   the Management Information Base or MIB.  MIB objects are generally
   accessed through the Simple Network Management Protocol (SNMP).
   Objects in the MIB are defined using the mechanisms defined in the
   Structure of Management Information (SMI).

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   For a detailed overview of the documents that describe the current
   Internet-Standard Management Framework, please refer to section 7 of
   RFC 3410 [RFC3410].

   This document discusses MIB modules that are compliant to the SMIv2,
   which is described in [RFC2578], [RFC2579] and [RFC2580].


4. Overview of Existing Work

   This section describes the existing tools and techniques for
   managing and modeling MPLS networks, devices, and protocols. It is
   intended to provide a description of the tool kit that is already
   available.

   Section 5 of this document outlines the applicability of existing
   MPLS MIB modules to MPLS-TP, describes the optional use of GMPLS MIB
   modules in MPLS-TP networks, and examines the additional MIB modules
   and objects that would be required for managing an MPLS-TP network.

4.1. MPLS Management Overview and Requirements

   [RFC4378] outlines how data plane protocols can assist in providing
   the Operations and Management (OAM) requirements outlined in
   [RFC4377] and how it is applied to the management functions of fault,
   configuration, accounting, performance, and security (commonly known
   as FCAPS) for MPLS networks.

   [RFC4221] describes the management architecture for MPLS. In
   particular, it describes how the managed objects defined in various
   MPLS-related MIB modules model different aspects of MPLS, as well as
   the interactions and dependencies between each of these MIB modules.

   [RFC4377] describes the requirements for user and data plane OAM and
   applications for MPLS.

   [RFC5654] describes the requirements for the optional use of a
   control plane to support dynamic provisioning of MPLS-TP transport
   paths. The MPLS-TP LSP control plane is based on GMPLS and is
   described in [RFC3945].

4.2. An Introduction to the MPLS and Pseudowire MIB Modules

4.2.1. Structure of the MPLS MIB OID Tree

   The MPLS MIB OID tree has the following structure. It is based on the
   tree originally set out in section 4.1 of [RFC4221] and has been
   enhanced to include other relevant MIB modules.


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    mib-2 -- RFC 2578 [RFC2578]
     |
     +-transmission
     |  |
     |  +- mplsStdMIB
     |  |    |
     |  |    +- mplsTCStdMIB -- MPLS-TC-STD-MIB [RFC3811]
     |  |    |
     |  |    +- mplsLsrStdMIB -- MPLS-LSR-STD-MIB [RFC3813]
     |  |    |
     |  |    +- mplsTeStdMIB -- MPLS-TE-STD-MIB [RFC3812]
     |  |    |
     |  |    +- mplsLdpStdMIB -- MPLS-LDP-STD-MIB [RFC3815]
     |  |    |
     |  |    +- mplsLdpGenericStdMIB
     |  |    |                -- MPLS-LDP-GENERIC-STD-MIB [RFC3815]
     |  |    |
     |  |    +- mplsFTNStdMIB -- MPLS-FTN-STD-MIB [RFC3814]
     |  |    |
     |  |    +- gmplsTCStdMIB -- GMPLS-TC-STD-MIB [RFC4801]
     |  |    |
     |  |    +- gmplsTeStdMIB -- GMPLS-TE-STD-MIB [RFC4802]
     |  |    |
     |  |    +- gmplsLsrStdMIB -- GMPLS-LSR-STD-MIB [RFC4803]
     |  |    |
     |  |    +- gmplsLabelStdMIB -- GMPLS-LABEL-STD-MIB [RFC4803]
     |  |
     |  +- teLinkStdMIB -- TE-LINK-STD-MIB [RFC4220]
     |  |
     |  +- pwStdMIB -- PW-STD-MIB [RFC5601]
     |
     +- ianaGmpls -- IANA-GMPLS-TC-MIB [RFC4802]
     |
     +- ianaPwe3MIB -- IANA-PWE3-MIB [RFC5601]
     |
     +- pwEnetStdMIB -- PW-ENET-STD-MIB [RFC5603]
     |
     +- pwMplsStdMIB -- PW-MPLS-STD-MIB [RFC5602]
     |
     +- pwTDMMIB -- PW-TDM-MIB [RFC5604]
     |
     +- pwTcStdMIB -- PW-TC-STD-MIB [RFC5542]

   Note: The OIDs for MIB modules are assigned and managed by IANA.
   They can be found in the referenced MIB documents.


4.2.2. Textual Convention Modules



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   MPLS-TC-STD-MIB [RFC3811], GMPLS-TC-STD-MIB [RFC4801],
   IANA-GMPLS-TC-MIB [RFC4802] and PW-TC-STD-MIB [RFC5542] contains the
   Textual Conventions for MPLS and GMPLS networks.  These Textual
   Conventions should be imported by MIB modules which manage MPLS
   and GMPLS networks. Section 3.2.11. highlights dependencies on
   additional external MIB modules

4.2.3. Label Edge Router (LER) Modules

   Label Edge Router (LER) Module helps in mapping data to LSP's
   based on the network layer header. The ingress device of the MPLS
   network is called Label Edge Routers (LER).

   At the LER when an unlabelled packet enters the ingress interface,
   network layer header is parsed to classify the packet to a forwarding
   equivalence class (FEC). Each FEC is mapped to an LFIB entry to
   encapsulate the unlabelled packet with one or more label entries
   referred to as the label stack. Each label stack entry consists of a
   label, the 3 TC-bits for classifying the Traffic Class, the bottom of
   stack bit, and TTL.

   MPLS-FTN-STD-MIB [RFC3814] describes the managed objects for mapping
   FEC's to label bindings.

4.2.4. Label Switching Router Modules

   A router which performs MPLS forwarding is known as an LSR. An LSR
   receives a labelled packet and performs forwarding action based on
   the label received.

   LSR maintains a mapping of an incoming label and incoming interface
   to one or more outgoing label and outgoing interfaces in its
   forwarding database. When a labelled packet is received, LSR examines
   the topmost label in the label stack and then does 'swap', 'push' or
   'pop' operation based on the contents.

   MPLS-LSR-STD-MIB [RFC3813] describes the managed objects for modeling
   a Multiprotocol Label Switching (MPLS) [RFC3031] LSR.
   MPLS-LSR-STD-MIB [RFC3813] contains the managed objects to maintain
   mapping of in-segments to out-segments.

4.2.5. Label Switched Path Modules

   The path taken through the MPLS domain by a packet is referred to as
   a label switched path (LSP). It is possible that this path may not be
   understood or completely stored in any one LSR within the MPLS
   domain.

   MPLS-LSR-STD-MIB [RFC3813] describes the required objects to define
   the LSP.

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4.2.6. Pseudowire Modules

   The PW (Pseudowire) MIB architecture provides a layered
   modular model into which any supported emulated service such as Frame
   Relay, ATM, Ethernet, TDM and SONET/SDH can be connected to any
   supported packet switched network (PSN) type. This MIB architecture
   is modeled based on PW3 architecture [RFC3985].

   Emulated Service Layer, Generic PW Layer and PSN VC Layer constitute
   the different layers of the model. A combination of the MIB modules
   belonging to each layer provides the glue for mapping the emulated
   service onto the native PSN service. At least three MIB modules each
   belonging to a different layer are required to define a PW emulated
   service.

   o Service-Specific module is dependent on the emulated signal type
     and helps in modeling emulated service layer.

   PW-ENET-STD-MIB [RFC5603] describes a model for managing Ethernet
   pseudowire services for transmission over a PSN. This MIB module is
   generic and common to all types of PSNs supported in the Pseudowire
   Emulation Edge-to-Edge (PWE3) architecture [RFC3985], which describes
   the transport and encapsulation of L1 and L2 services over supported
   PSN types.

   In particular, the MIB module associates a port or specific VLANs on
   top of a physical Ethernet port or a virtual Ethernet interface (for
   Virtual Private LAN Service (VPLS)) to a point-to-point PW.  It is
   complementary to the PW-STD-MIB [RFC5601], which manages the generic
   PW parameters common to all services, including all supported PSN
   types.

   PW-TDM-MIB [RFC5604] describes a model for managing TDM pseudowires,
   i.e., TDM data encapsulated for transmission over a Packet Switched
   Network (PSN).  The term TDM in this document is limited to the
   scope of Plesiochronous Digital Hierarchy (PDH).  It is currently
   specified to carry any TDM Signals in either Structure Agnostic
   Transport mode (E1, T1, E3, and T3) or in Structure Aware
   Transport mode (E1, T1, and NxDS0) as defined in the Pseudowire
   Emulation Edge-to-Edge (PWE3) TDM Requirements document [RFC4197].

   o Generic PW Module configures general parameters of the PW that are
     common to all types of emulated services and PSN types.

   PW-STD-MIB [RFC5601] defines a MIB module that can be
   used to manage pseudowire (PW) services for transmission over a
   Packet Switched Network (PSN) [RFC3931] [RFC4447].  This MIB module
   provides generic management of PWs that is common to all types of
   PSN and PW services defined by the IETF PWE3 Working Group.


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   o PSN-specific module associate the PW with one or more "tunnels"
     that carry the service over the PSN.  There is a different module
     for each type of PSN.

   PW-MPLS-STD-MIB [RFC5602] describes a model for managing pseudowire
   services for transmission over different flavors of MPLS tunnels.
   The general PW MIB module [RFC5601] defines the parameters global to
   the PW regardless of the underlying Packet Switched Network (PSN)
   and emulated service.  This document is applicable for PWs that use
   MPLS PSN type in the PW-STD-MIB. Additionally this document describes
   the MIB objects that define pseudowire association to the MPLS PSN,
   that is not specific to the carried service.

   Together, [RFC3811], [RFC3812] and [RFC3813] describe the modeling of
   an MPLS tunnel, and a tunnel's underlying cross-connects.  This MIB
   module supports MPLS-TE PSN, non-TE MPLS PSN (an outer tunnel created
   by the Label Distribution Protocol (LDP) or manually), and MPLS PW
   label only (no outer tunnel).

4.2.7. Routing and Traffic Engineering

   In MPLS traffic engineering, it's possible to specify explicit routes
   or choose routes based on QOS metrics in setting up a path such that
   some specific data can be routed around network hot spots. TE LSPs
   can be setup through a management plane or a control plane.

   MPLS-TE-STD-MIB [RFC3812] describes managed objects for modeling a
   Multiprotocol Label Switching (MPLS) [RFC3031] based traffic
   engineering.  This MIB module should be used in conjunction with the
   companion document [RFC3813] for MPLS based traffic engineering
   configuration and management.

4.2.8. Resiliency

   An MPLS resiliency is to make sure that there is no interruption to
   traffic when the failure occurs within the system or network.

   Various components of MPLS resiliency solutions are,
   1) Graceful restart in LDP and RSVP-TE modules
   2) Make Before Break
   3) Protection Switching for LSPs
   4) Fast ReRoute for LSPs
   5) PW redundancy

   The below modules only support the SNMP based mib management
   for MPLS resiliency.

   MPLS Fast Reroute is a restoration network resiliency mechanism used
   in MPLS TE to redirect the traffic onto the backup LSP's in 10s of
   milliseconds in case of link or node failure across the LSP.

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   MPLS-FRR-GENERAL-STD-MIB [draft-ietf-mpls-fastreroute-mib-14]
   contains objects that apply to any MPLS LSR implementing MPLS TE fast
   reroute functionality.

   MPLS-FRR-ONE2ONE-STD-MIB [draft-ietf-mpls-fastreroute-mib-14]
   contains objects that apply to one-to-one backup method.
   MPLS-FRR-FACILITY-STD-MIB [draft-ietf-mpls-fastreroute-mib-14]
   contains objects that apply to facility backup method.

   Protection Switching mechanisms have been designed to provide network
   resiliency for MPLS network. Different types of protection switching
   mechanisms such as 1:1, 1:N, 1+1 have been designed.

4.2.9. Fault Management and Performance Management

   MPLS manages the LSP and pseudowire faults through the use of LSP
   ping [RFC4379], VCCV [RFC5085], BFD for LSPs [RFC5884] and BFD for
   VCCV [RFC5885] tools.

   Current MPLS focuses on the in and/or out packet counters,
   errored packets, discontinuity time.

   Some of the MPLS and Pseudowire performance tables used for
   performance management are given below.

   mplsTunnelPerfTable provides several counters (packets forwarded,
   packets dropped because of errors) to measure the performance of
   the MPLS tunnels.

   mplsInterfacePerfTable provides performance information (incoming and
   outgoing labels in use and lookup failures) on a per-interface basis.

   mplsInSegmentPerfTable contains statistical information (total
   packets received by the insegment, total errored packets received,
   total packets discarded, discontinuity time) for incoming MPLS
   segments to an LSR.

   mplsOutSegmentPerfTable contains statistical information (total
   packets received, total errored packets received, total packets
   discarded, discontinuity time) for outgoing MPLS segments from an
   LSR.

   mplsFTNPerfTable contains performance information for the specified
   interface and an FTN entry mapped to this interface.

   mplsLdpEntityStatsTable and mplsLdpSessionStatsTable contain
   statistical information (session attempts, errored packets,
   notifications) about an LDP entity.



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   pwPerfCurrentTable, pwPerfIntervalTable, pwPerf1DayIntervalTable
   provides pseudowire performance information (in and/or out packets)
   based on time (current interval, preconfigured specific interval,
   1day interval).

   pwEnetStatsTable contains statistical counters specific for Ethernet
   PW.

   pwTDMPerfCurrentTable, pwTDMPerfIntervalTable and
   pwTDMPerf1DayIntervalTable contain statistical informations
   accumulated per 15-minute, 24 hour, 1 day respectively.
   gmplsTunnelErrorTable and gmplsTunnelReversePerfTable provides
   information about performance errored packets and in/out packet
   counters.

4.2.10. MIB Module Interdependencies

   This section provides an overview of the relationship between the
   MPLS MIB modules for managing MPLS networks. More details of these
   relationships are given below.

   [RFC4221] mainly focuses on the MPLS MIB module interdependencies,
   this section also highlights the GMPLS and PW MIB modules
   interdependencies.

   The relationship "A --> B" means A depends on B and that MIB module
   A uses an object, object identifier, or textual convention defined
   in MIB module B, or that MIB module A contains a pointer (index or
   RowPointer) to an object in MIB module B.






















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   +-------> MPLS-TC-STD-MIB <-----------------------------------------+
   |            ^                                                      |
   |            |                                                      |
   |         MPLS-LSR-STD-MIB <--------------------------------+       |
   |                                                           |       |
   +<----------------------- MPLS-LDP-STD-MIB ---------------->+       |
   |                                    ^                      |       |
   |                                    |                      |       |
   +<-- MPLS-LDP-GENERIC-STD-MIB ------>+                      |       |
   |                                                           |       |
   +<------ MPLS-FTN-STD-MIB ---------+----------------------->+       |
   |                 |                |                                |
   |                 V                |                                |
   +<------------- MPLS-TE-STD-MIB  ->+                                |
                                      |  GMPLS-TC-STD-MIB ------------>+
                                      |    ^                           |
                                      |    |                           |
                                  +---+    +<-- GMPLS-LABEL-STD-MIB -->+
                                  |   ^    ^      ^                    |
                                  |   |    |      |                    |
   +----> PW-TC-STD-MIB           |  GMPLS-LSR-STD-MIB --------------->+
   |                              |      ^       ^                     |
   |                              |      |       |                     |
   |   IANA-PWE3-MIB              |      |       | IANA-GMPLS-TC-MIB   |
   |         ^                    |      |       |    ^                |
   |         |                    |      |       |    |                |
   |         |                    +<--- GMPLS-TE-STD-MIB ------------->+
   |         |                    ^                                    |
   +<--- PW-STD-MIB <------+      |                                    |
   |                       |      |                                    |
   +<--- PW-ENET-STD-MIB ->+      |                                    |
   |                       ^      |                                    |
   |                       |      |                                    |
   +<---------------- PW-MPLS-STD-MIB -------------------------------->+

   Thus:

   -  All the MPLS MIB modules depend on MPLS-TC-STD-MIB.

   -  All the GMPLS MIB modules depend on GMPLS-TC-STD-MIB.

   -  All the PW MIB modules depend on PW-TC-STD-MIB.

   -  MPLS-LDP-STD-MIB, MPLS-TE-STD-MIB, MPLS-FTN-STD-MIB,
      GMPLS-LSR-STD-MIB, and PW-MPLS-STD-MIB contain references to
      objects in MPLS-LSR-STD-MIB.

   -  MPLS-LDP-GENERIC-STD-MIB contains references to objects in
      MPLS-LDP-STD-MIB.


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   -  MPLS-FTN-STD-MIB, PW-MPLS-STD-MIB, and GMPLS-TE-STD-MIB contain
      references to objects in MPLS-TE-STD-MIB.

   -  PW-MPLS-STD-MIB, and PW-ENET-STD-MIB contains references to
      objects in PW-STD-MIB.

   -  PW-STD-MIB contains references to objects in IANA-PWE3-MIB.

   -  GMPLS-TE-STD-MIB contains references to objects in
      IANA-GMPLS-TC-MIB.

   -  GMPLS-LSR-STD-MIB contains references to objects in
      GMPLS-LABEL-STD-MIB.

   Note that there is a textual convention (MplsIndexType) defined in
   MPLS-LSR-STD-MIB that is imported by MPLS-LDP-STD-MIB.

4.2.11. Dependencies on External MIB Modules

   With the exception of MPLS-TC-STD-MIB, all the MPLS MIB modules have
   dependencies on the Interfaces MIB [RFC2863].  MPLS-FTN-STD-MIB
   references IP-capable interfaces on which received traffic is to be
   classified using indexes in the Interface Table (ifTable) of IF-MIB
   [RFC2863].  The other MPLS MIB modules reference MPLS-capable
   interfaces in ifTable.

   The Interfaces Group of IF-MIB [RFC2863] defines generic managed
   objects for managing interfaces.  The MPLS MIB modules contain
   media-specific extensions to the Interfaces Group for managing MPLS
   interfaces.

   The MPLS MIB modules assume the interpretation of the Interfaces
   Group to be in accordance with [RFC2863], which states that ifTable
   contains information on the managed resource's interfaces and that
   each sub-layer below the internetwork layer of a network interface is
   considered an interface.  Thus, the MPLS interface is represented as
   an entry in ifTable.

   The interrelation of entries in ifTable is defined by the Interfaces
   Stack Group defined in [RFC2863].

   The MPLS MIB modules have dependencies with the TE-LINK-STD-MIB
   for maintaining the traffic engineering information.

   The MPLS MIB modules depend on the constrained shortest path first
   (CSPF) module to obtain the path required for an MPLS tunnel to reach
   the end point of the tunnel and BFD module to verify the data-plane
   failures of LSPs and PWs.



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   Finally, all of the MIB modules import standard textual conventions
   such as integers, strings, timestamps, etc., from the MIB modules in
   which they are defined.

5. Applicability of MPLS MIB modules to MPLS-TP

   This section and its sub sections focus on the possible gaps that
   exist in the MPLS MIB modules to extend its use to MPLS-TP networks.

   [RFC5951] specifies the requirements for the management of
   equipment used in networks supporting an MPLS-TP. It also details the
   essential network management capabilities for operating networks
   consisting of MPLS-TP equipment.

   [RFC5950] provides the network management framework for
   MPLS-TP. The document explains how network elements and networks that
   support MPLS-TP can be managed using solutions that satisfy the
   requirements defined in [RFC5951]. The relationship between
   MPLS-TP management and OAM is described in the MPLS-TP framework
   [RFC5950] document.

   The MPLS mib modules MPLS-TE-STD-MIB [RFC3812], PW-STD-MIB [RFC5601]
   and MPLS-LSR-STD-MIB [RFC3813] and their associated mib modules are
   reused for MPLS based transport network management.

   Fault management and performance management form key parts of
   Operations, Administration, and Maintenance (OAM) function. MPLS-TP
   OAM is described in [MPLS-TP-OAM-FWK].

   A seperate draft will provide an MPLS-TP abstract model and use a
   formal language to define the terminology, the information that
   must be retrieved and method for storing.

5.1 MPLS-TP Tunnel

5.1.1 Gap Analysis

  MPLS-TP tunnel can be operated over IP and/or ICC environments,
  below points capture the gaps in existing MPLS mib modules
  for managing the MPLS-TP networks.

   o IP based environment
      i. MPLS-TE-STD-MIB [RFC3812] does not support
         tunnel LSR identifier based on Global_ID and Node_ID.
      ii. MPLS-TE-STD-MIB [RFC3812] does not support
          corouted/associated bidirectional tunnel configurations.





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   o ICC based environment
      i. MPLS-TE-STD-MIB [RFC3812] does not support
         tunnel LSR identifier based on ICC.
     ii. MPLS tunnel does not support forwarding other
         than the nexthop IP address.

5.1.2 Recommendations

   o New MIB definitions can be created for Global_Node_ID and/or
     ICC configurations.
   o MPLS-LSR-STD-MIB [RFC3813] mib module can be enhanced to identify
     the nexthop based on MAC address for IP-less environment.
   o MPLS-TE-STD-MIB [RFC3812] and MPLS-LSR-STD-MIB should be
     enhanced to provide static and signalling mib module
     extensions for corouted/associated bidirectional LSPs.

5.2 MPLS-TP Pseudowire

5.2.1 Gap Analysis

   MPLS-TP Pseudowire can be operated over IP and/or ICC environments,
   below points capture the gaps in existing PW mib modules
   for managing the MPLS-TP networks.

   o IP based environment
      i. PW-STD-MIB [RFC5601] does not support
         PW end point identifier based on Global_ID and Node_ID.
      ii. PW-MPLS-STD-MIB [RFC5602] does not support
         its opeation over corouted/associated bidirectional tunnels.

   o ICC based environment
      i. PW-STD-MIB [RFC5601] does not support
         PW end point identifier based on ICC.
     ii. Pseudowire does not support forwarding other
         than the nexthop IP address.

5.2.2 Recommendations

   o PW-MPLS-STD-MIB [RFC5602] can be enhanced to operate over
     corouted/associated bi-directional tunnel.
   o Pseudowire 129 FEC type-2 can be used in non-IP and IP
     environments with the required changes.

5.3 MPLS-TP Sections

5.3.1 Gap Analysis

   The existing MPLS MIB modules does not support MPLS-TP sections.

5.3.2 Recommendations

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   Link specific and/or path/segment specific sections can be achieved
   by enhancing the IF-MIB [RFC2863], MPLS-TE-STD-MIB [RFC3812] and
   PW-STD-MIB [RFC5601] mib modules.

5.4 MPLS-TP OAM

5.4.1 Gap Analysis

   MPLS manages the LSP and pseudowire faults through LSP ping
   [RFC4379], VCCV [RFC5085], BFD for LSPs [RFC5884] and BFD for VCCV
   [RFC5885] tools.

   The MPLS mib modules do not support the below MPLS-TP OAM functions,
    o Continuity Check and Connectivity Verification
    o Remote Defect Indication
    o Route Tracing
    o Alarm Reporting
    o Lock Reporting
    o Lock Instruct
    o Client Failure Indication
    o Packet Loss Measurement
    o Packet Delay Measurement

5.4.2 Recommendations

   New mib modules for BFD and LSP Ping can be created to address
   all the gaps mentioned in the 5.4.1 Gap Analysis section.

5.5 MPLS-TP Protection Switching and Recovery

5.5.1 Gap Analysis

   An important aspect that MPLS-TP technology provides is protection
   switching. In general, the mechanism of protection switching
   can be described as the substitution of a protection or standby
   facility for a working or primary facility.

   The MPLS mib modules do not provide support for protection switching
   and recovery of three different topologies (linear, ring and mesh)
   available.

5.5.2 Recommendations

   New mib modules can be created to address all the gaps mentioned
   in the 5.5.1 Gap Analysis section.

5.6 MPLS-TP Interfaces

5.6.1 Gap Analysis


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   As per [MPLS-TP-IDENTIFIERS], an LSR requires identification of the
   node itself and of its interfaces.  An interface is the attachment
   point to a server layer MPLS-TP section or MPLS-TP tunnel.

   The MPLS mib modules do not provide support for configuring
   the interfaces within the context of an operator.

5.6.2 Recommendations

   New mib defintions can be created to address the gaps mentioned
   in the 5.6.1 Gap Analysis section.

6. An Introduction to the MPLS-TP MIB Modules

   This section highlights new MIB modules that have been identified
   as being required for MPLS-TP. This section also provides an overview
   of the following:

   -  the MPLS Object Identifier (OID) tree structure and the position
      of different MPLS related MIB modules on this tree;

   -  the purpose of each of the MIB modules within the MIB documents,
      what it can be used for, and how it relates to the other MIB
      modules.

   Note that each new MIB module (apart from Textual Conventions
   modules) will contain one or more Compliance Statements to indicate
   which objects must be suppor in what manner to claim a specific level
   of compliance. Additional text, either in the documents that define
   the MIB modules or in separate Applicability Statements, will define
   which Compliance Statements need tbe conformed to in order to provide
   specific MPLS-TP function. This document does not set any
   requirements in that respect although some recommendations are
   included in the sections that follow.

6.1 MPLS-TP MIB Modules

6.1.1 Structure of the MPLS-TP MIB OID Tree

   The MPLS-TP MIB OID tree has the following structure.

      transmission -- RFC 2578 [RFC2578]
        |
        +- mplsStdMIB
             |
             +- Textual Conventions for MPLS-TP
             |
             +- Identifiers for MPLS-TP
             |
             +- LSR MIB Extensions for MPLS-TP
             |
             +- TE MIB Extensions for MPLS-TP

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   Note that the mib modules mentioned here are applicable
   for MPLS operations as well.

   Note: The OIDs for MIB modules are yet to be assigned and managed by
   IANA.

6.1.2 Textual Conventions for MPLS-TP

   New textual convention mib module defines textual
   conventions [RFC2579] for MPLS-TP related MIB modules.
   These conventions allow multiple MIB modules to use the
   same syntax and format for a concept that is shared between
   the MIB modules.

   For example, MEP identifier is used to identify maintenance entity
   group end point within MPLS-TP networks. The textual convention
   representing the MEP identifier is defined in new textual convention
   mib module.

   All new extensions related to MPLS-TP are defined in the MIB module
   and will be referenced by other MIB modules to support MPLS-TP.

6.1.3 Identifiers for MPLS-TP

   New Identifiers describe managed objects that are used to model
   common MPLS-TP identifiers [MPLS-TP-IDENTIFIERS].

6.1.4 LSR MIB Extensions for MPLS-TP

   MPLS-LSR-STD-MIB describes managed objects for modeling an MPLS Label
   Switching Router (LSR).  This puts it at the heart of the management
   architecture for MPLS.

   In the case of MPLS-TP, the MPLS-LSR-STD-MIB is extended to support
   the MPLS-TP LSP's, which are corouted or associated bidirectional.
   This extended MIB is also applicable for modeling MPLS-TP tunnels.

6.1.5 Tunnel Extensions for MPLS-TP

   MPLS-TE-STD-MIB describes managed objects that are used to model and
   manage MPLS Traffic Engineered (TE) Tunnels.

   MPLS-TP tunnels are much similar to MPLS-TE tunnels, but are
   bidirectional and could be co-routed or associated.
   The MPLS-TE-STD-MIB is extended to support the MPLS-TP specific
   attributes for the tunnel.

6.2 PWE3 MIB Modules for MPLS-TP

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   This section provides an overview of Pseudowire extension mib
   modules to meet the MPLS based transport network requirements.

6.2.1 Structure of the PWE3 MIB OID Tree for MPLS-TP

    mib-2 -- RFC 2578 [RFC2578]
     |
     +-transmission
     |  |
     |  +- Pseudowire Extensions for MPLS-TP
     |
     +- Pseudowire MPLS Extensions for MPLS-TP
     |
     +- Pseudowire Textual Conventions for MPLS-TP

   Note: The OIDs for MIB modules are yet to be assigned and managed by
   IANA.

6.2.2 Pseudowire Textual Conventions for MPLS-TP

   PW-TC-STD-MIB MIB defines textual conventions used for pseudowire
   (PW) technology and for Pseudowire Edge-to-Edge Emulation (PWE3) MIB
   Modules. New textual convention mib module defines textual
   definitions for MPLS-TP specific Pseudowire attributes.

6.2.3 Pseudowire Extensions for MPLS-TP

   PW-STD-MIB describes managed objects for modeling of Pseudowire
   Edge-to-Edge services carried over a general Packet Switched Network.
   This MIB module is extended to support MPLS-TP specific attributes
   related to Pseudowires.

6.2.4 Pseudowire MPLS Extensions for MPLS-TP

   PW-MPLS-STD-MIB defines the managed objects for Pseudowire
   operations over MPLS LSR's. This MIB supports both,
   manual and dynamically signaled PW's, point-to-point connections,
   enables the use of any emulated service, MPLS-TE as outer tunnel
   and no outer tunnel as MPLS-TE.

   The newly extended MIB defines the managed objects,
   extending PW-MPLS-STD-MIB, by supporting with or without
   MPLS-TP as outer tunnel.

6.3 OAM MIB Modules for MPLS-TP

   This section provides an overview of Operations, Administration,
   and Maintenance (OAM) mib modules for MPLS LSPs and Pseudowires.

6.3.1 Structure of the OAM MIB OID Tree for MPLS-TP

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  mib-2 -- RFC 2578 [RFC2578]
     |
     +-transmission
        |
        +- LSP Ping MIB module
        |
        +- BFD MIB module
        |
        +- OAM MIB module

   Note: The OIDs for MIB modules are yet to be assigned and managed by
   IANA.

6.3.2 LSP Ping MIB module

   LSP ping is defined in [RFC4379] to validate data plane consistency
   of MPLS LSP's. It defines how LSP ping and Trace Route could be
   performed across MPLS networks to identify and diagnose faults
   within MPLS networks. This OAM functionality is performed on demand
   basis for verification purposes.

   New mib module defines managed objects for modeling LSP ping
   protocol. It allows user to perform on demand operations based on
   [RFC4379].

   For example, a MPLS-TP tunnel LSP is to be pinged, a SNMP request
   issued using the MIB for the tunnel in test. The results for the
   operation could be queried using the managed objects defined in the
   MIB module.

6.3.3 BFD MIB module

   BFD-STD-MIB defines managed objects for performing BFD operation in
   IP networks. This MIB is modeled to support BFD protocol [RFC5880].
   New mib module is an extension to BFD-STD-MIB managed objects
   to support BFD operations on MPLS LSPs and PWs.

6.3.4 Common OAM MIB modules

   New mib module defines managed objects for OAM maintenance
   identifiers i.e. Maintenance Entity Group Identifiers (MEG),
   Maintenance Entity Group End-point (MEP), Maintenance Entity Group
   Intermediate Point (MIP). Maintenance points are uniquely
   associated with a MEG. Within the context of a MEG, MEPs and MIPs
   must be uniquely identified.

6.4. Protection Switching and Recovery MIB Modules for MPLS-TP

   This section provides an overview of protection switching and
   recovery MIB modules for MPLS LSPs and Pseudowires.

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6.4.1 Structure of the MPLS Protection Switching and Recovery MIB OID
      Tree for MPLS-TP

    mib-2 -- RFC 2578 [RFC2578]
     |
     +-transmission
        |
        +- Linear Protection Switching MIB module
        |
        +- Ring Protection Switching MIB module
        |
        +- Mesh Protection Swithcing MIB module

   Note: The OIDs for MIB modules are yet to be assigned and managed by
   IANA.

6.4.2 Linear Protection Switching MIB module

   New mib module defines managed objects for linear protection
   switching of MPLS LSPs and Pseudowires.

6.4.3 Ring Protection Switching MIB module

   New mib module defines managed objects for ring protection
   switching of MPLS LSPs and Pseudowires.

6.4.4 Mesh Protection Switching MIB module

   New mib module defines managed objects for Mesh protection
   switching of MPLS LSPs and Pseudowires.

7. Management Options

   This document applies only to scenarios where MIB modules are used to
   manage the MPLS-TP network. It is not the intention of this document
   to provide instructions or advice to implementers of management
   systems, management agents, or managed entities.  It is, however,
   useful to make some observations about how the MIB modules described
   above might be used to manage MPLS systems, if SNMP is used in the
   management interface.

   For MPLS specific management options, refer [RFC4221] Section 12
   (Management Options).


8. Security Considerations



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   This document describes the interrelationships amongst the different
   MIB modules relevant to MPLS-TP management and as such does not have
   any security implications in and of itself.

   Each IETF MIB document that specifies MIB objects for MPLS-TP must
   provide a proper security considerations section that explains the
   security aspects of those objects.

   The attention of readers is particularly drawn to the security
   implications of making MIB objects available for create or write
   access through an access protocol such as SNMP.  SNMPv1 by itself is
   an insecure environment.  Even if the network itself is made secure
   (for example, by using IPSec), there is no control over who on the
   secure network is allowed to access the objects in this MIB.  It is
   recommended that the implementers consider the security features as
   provided by the SNMPv3 framework.  Specifically, the use of the
   User-based Security Model STD 62, RFC3414 [RFC3414], and the
   View-based Access Control Model STD 62, RFC 3415 [RFC3415],
   is recommended.

   It is then a customer/user responsibility to ensure that the SNMP
   entity giving access to an instance of each MIB module is properly
   configured to give access to only those objects, and to those
   principals (users) that have legitimate rights to access them.


9. IANA Considerations

   This document makes no requests for IANA action.


10. Acknowledgements

   The authors would like to thank Eric Gray, Thomas Nadeau, Benjamin
   Niven-Jenkins and Saravanan Narasimhan for their valuable comments.

   This document benefited from review by participants in ITU-T Study
   Group 15.


11. References

11.1 Normative References

   [RFC2863]  McCloghrie, K. and F. Kastenholz, "The Interfaces Group
              MIB using SMIv2", RFC 2863, June 2000.

   [RFC3811]  Nadeau, T. and J. Cucchiara, "Definition of Textual
              Conventions and for Multiprotocol Label Switching (MPLS)
              Management", RFC 3811, June 2004.

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   [RFC3812]  Srinivasan, C., Viswanathan, A., and T. Nadeau,
              "Multiprotocol Label Switching (MPLS) Traffic
              Engineering (TE) Management Information Base (MIB)",
              RFC 3812, June 2004.

   [RFC3813]  Srinivasan, C., Viswanathan, A., and T.  Nadeau,
              "Multiprotocol Label Switching (MPLS) Label Switching
              (LSR) Router Management Information Base (MIB)", RFC 3813,
              June 2004.

   [RFC3814]  Nadeau, T., Srinivasan, C., and A.  Viswanathan,
              "Multiprotocol Label Switching (MPLS) FEC-To-NHLFE
              (FTN) Management Information Base", RFC3814, June
              2004.

   [RFC3815]  Cucchiara, J., Sjostrand, H., and Luciani, J.,
              "Definitions of Managed Objects for the
              Multiprotocol Label Switching (MPLS), Label
              Distribution Protocol (LDP)", RFC 3815, June 2004.

   [RFC4220]  Dubuc, M., Nadeau, T., and J. Lang, "Traffic
              Engineering Link Management Information Base", RFC
              4220, November 2005.

   [RFC4221]  Nadeau, T., Srinivasan, C., and A. Farrel,
              "Multiprotocol Label Switching (MPLS) Management
              Overview", RFC 4221, November 2005.

   [RFC4801]  T. Nadeau and A. Farrel, Ed., "Definitions of Textual
              Conventions for Generalized Multiprotocol Label Switching
              (GMPLS) Management", RFC4801, Feb. 2007.

   [RFC4802]  T. D. Nadeau and A. Farrel, "Generalized Multiprotocol
              Label Switching (GMPLS) Traffic Engineering Management
              Information Base", RFC4802, Feb., 2007.

   [RFC4803]  T. D. Nadeau and A. Farrel, "Generalized Multiprotocol
              Label Switching (GMPLS) Label Switching Router (LSR)
              Management Information Base", RFC4803, Feb., 2007.

   [RFC5542]  Nadeau, T., Ed., Zelig, D., Ed., and O. Nicklass, Ed.,
              "Definitions of Textual Conventions for Pseudowire (PW)
              Management", RFC 5542, May 2009.

   [RFC5601]  Nadeau, T., Ed. and D. Zelig, Ed. "Pseudowire (PW)
              Management Information Base (MIB)", RFC 5601, July 2009.

   [RFC5602]  Zelig, D., Ed., and T. Nadeau, Ed., "Pseudowire (PW) over
              MPLS PSN Management Information Base (MIB)", RFC 5602,
              July 2009.

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   [RFC5603]  Zelig, D., Ed., and T. Nadeau, Ed., "Ethernet Pseudowire
              (PW) Management Information Base (MIB)", RFC 5603,
              July 2009.

   [RFC5604]  Nicklass, O., "Managed Objects for Time Division
              Multiplexing (TDM) over Packet Switched Networks (PSNs)",
              RFC5604, July 2009.

11.2 Informative References

   [RFC2578]  McCloghrie, K., Perkins, D., and J. Schoenwaelder,
              "Structure of Management Information Version 2
              (SMIv2)", STD 58, RFC 2578, April 1999.

   [RFC2579]  McCloghrie, K., Perkins, D., and J. Schoenwaelder,
              "Textual Conventions for SMIv2", STD 58, RFC 2579,
              April 1999.

   [RFC2580]  McCloghrie, K., Perkins, D., and J. Schoenwaelder,
              "Conformance Statements for SMIv2", STD 58, RFC 2580,
              April 1999.

   [RFC3031]  Rosen, E., Viswanathan, A., and R. Callon,
              "Multiprotocol Label Switching Architecture", RFC 3031,
              March 2001.

   [RFC3410]  Case, J., Mundy, R., Partain, D. and B. Stewart,
              "Introduction and Applicability Statements for
              Internet-Standard Management Framework", RFC 3410,
              December 2002.

   [RFC3414]  Blumenthal, U. and B. Wijnen, "User-based Security
              Model (USM) for version 3 of the Simple Network
              Management Protocol (SNMPv3)", STD 62, RFC 3414,
              December 2002.

   [RFC3415]  Wijnen, B., Presuhn, R., and K. McCloghrie, "View-based
              Access Control Model (VACM) for the Simple Network
              Management Protocol (SNMP)", STD 62, RFC 3415, December
              2002.

   [RFC3812]  Srinivasan, C., Viswanathan, A., and T. Nadeau,
              "Multiprotocol Label Switching (MPLS) Traffic Engineering
              (TE) Management Information Base (MIB)", RFC 3812, June
              2004.

   [RFC3813]  Srinivasan, C., Viswanathan, A., and T. Nadeau,
              "Multiprotocol Label Switching (MPLS) Label Switching
              Router (LSR) Management Information Base (MIB)", RFC 3813,
              June 2004.

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   [RFC3931]  Lau, J., Townsley, M., and I. Goyret, "Layer Two Tunneling
              Protocol - Version 3 (L2TPv3)", RFC 3931, March 2005.

   [RFC3945]  Mannie, E. et.al., "Generalized Multi-Protocol Label
              Switching (GMPLS) Architecture", IETF RFC 3945, October
              2004.

   [RFC3985]  Bryant, S. and P. Pate, "Pseudo Wire Emulation Edge-to-
              Edge (PWE3) Architecture", RFC 3985, March 2005.

   [RFC4197]  Riegel, M., "Requirements for Edge-to-Edge Emulation of
              Time Division Multiplexed (TDM) Circuits over Packet
              Switching Networks", RFC4197, October 2005.

   [RFC4377]  Nadeau, T., Morrow, M., Swallow, G., Allan, D., and S.
              Matsushima, "Operations and Management (OAM) Requirements
              for Multi-Protocol Label Switched (MPLS) Networks",
              RFC 4377, March 2006.

   [RFC4378]  Allan, D. and T. Nadeau, "A Framework for Multi-Protocol
              Label Switching (MPLS) Operations and Management (OAM)",
              RFC 4378, March 2006.


   [RFC4379]  Kompella, K. and G. Swallow, "Detecting Multi-Protocol
              Label Switched (MPLS) Data Plane Failures", RFC 4379,
              March 2006.

   [RFC4447]  Martini, L., Rosen, E., El-Aawar, N., Smith, T., and
              G. Heron, "Pseudowire Setup and Maintenance Using the
              Label Distribution Protocol (LDP)", RFC 4447,
              April 2006.

   [RFC5085]  Nadeau, T. and C. Pignataro, "Pseudowire Virtual
              Circuit Connectivity Verification (VCCV): A Control
              Channel for Pseudowires", RFC 5085, December 2007.

   [RFC5601]  Nadeau, T., Ed. and D. Zelig, Ed. "Pseudowire (PW)
              Management Information Base (MIB)", RFC 5601, July 2009.

   [RFC5602]  Zelig, D., Ed., and T. Nadeau, Ed., "Pseudowire (PW) over
              MPLS PSN Management Information Base (MIB)", RFC 5602,
              July 2009.

   [RFC5654]  Niven-Jenkins, B., et al, "MPLS-TP Requirements",
              RFC5654, September 2009.

   [RFC5880]  Katz, D. and D. Ward, "Bidirectional Forwarding
              Detection", RFC 5880, June 2010.

King & Venkatesan,  et al.                                    [Page 25]

draft-ietf-mpls-tp-mib-management-overview-04.txt             June 2011


   [RFC5884]  Aggarwal, R., Kompella, K., Nadeau, T., and G. Swallow,
              "Bidirectional Forwarding Detection (BFD) For MPLS
              Label Switched Paths (LSPs)", RFC 5884, June 2010.

   [RFC5885]  Nadeau, T. and C. Pignataro, "Bidirectional
              Forwarding Detection (BFD) for the Pseudowire
              Virtual Circuit Connectivity Verification (VCCV)",
              RFC5885, June 2010.

   [RFC5950]  Gray, E., Mansfield, S., Lam, K.,
              "MPLS-TP Network Management Framework", RFC 5950,
              September 2010.



   [RFC5951]  Gray, E., Mansfield, S., Lam, K., "MPLS TP
              Network Management Requirements", RFC 5951, September
              2010.

   [MPLS-TP-IDENTIFIERS] Bocci, M., Swallow, G., "MPLS-TP Identifiers"
              draft-ietf-mpls-tp-identifiers-04, March 2011.

   [MPLS-TP-OAM-FWK] Busi, I. and B. Niven-Jenkins, "MPLS-TP OAM
              Framework and Overview", 2009,
              <draft-ietf-mpls-tp-oam-framework>.


12. Authors' Addresses

   Adrian Farrel
   Old Dog Consulting
   UK
   Email: adrian@olddog.co.uk

   Daniel King
   Old Dog Consulting
   UK
   Email: daniel@olddog.co.uk

   Venkatesan Mahalingam
   Aricent
   India
   Email: venkatesan.mahalingam@aricent.com

   Scott Mansfield
   Ericsson
   300 Holger Way,  San Jose, CA  95134,  US
   Phone: +1 724 931 9316
   Email: scott.mansfield@ericsson.com





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   Jeong-dong Ryoo
   ETRI
   161 Gajeong, Yuseong, Daejeon, 305-700, South Korea
   Phone: +82 42 860 5384
   Email: ryoo@etri.re.kr

   A S Kiran Koushik
   Cisco Systems Inc.
   Email: kkoushik@cisco.com

   A. Karmakar
   Cisco Systems Inc.
   Email: akarmaka@cisco.com

   Sam Aldrin
   Huawei Technologies, co.
   2330 Central Express Way,
   Santa Clara, CA 95051, USA
   Email:  aldrin.ietf@gmail.com
































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