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Versions: 00 01 02 03 04 RFC 6671

Network Working Group                                          M. Betts
Internet Draft                                                      ZTE
Intended status: Informational                         January 16, 2012
Expires: July 16, 2012

      Allocation of an Associated Channel Code Point for Use by ITU-T
                            Ethernet based OAM

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on July 16, 2012.

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   This document assigns an Associated Channel Type code point for
   carrying Ethernet based Operations, Administration, and Management
   messages in the MPLS Generic Associated Channel (G-ACh).

1. Introduction

   MPLS-TP is a profile of MPLS technology for use in packet transport
   networks. The MPLS-TP profile includes a set of Operations,
   Administration, and Management (OAM) tools defined by the IETF
   [I-D.ietf-mpls-tp-oam-analysis], that are intended to meet the OAM
   functional requirements defined in [RFC5860].

   The ITU-T has documented, in draft new Recommendation [G.8113.1], the
   use of Ethernet based OAM mechanisms, originally defined in [Y.1731],
   carried in the MPLS Generic Associated Channel (G-ACh). This approach
   requires the allocation of an ACH Type from the registry of ACH types
   maintained by IANA in order that the messages that will be described
   in [G.8113.1] can be identified by an implementation.

   To fulfill the request from ITU-T SG15 and to allow deployment of an
   Ethernet based OAM solution without continuing to resorting to the
   use of an experimental ACH Type, this document requests IANA to
   assign an ACH Type code point for use by the ITU-T. The ACH type
   shall be known as the Ethernet based OAM ACH Type.

   A number of experts in the IETF do not consider that the development
   or deployment of a second protocol solution within the same
   architectural problem space is necessary or advisable
   [I-D.sprecher-mpls-tp-oam-considerations]. However, this view is not
   shared by the ITU-T.

2. Scope of the Ethernet based OAM ACH Type

   The code point allocated by this document is intended to be used for
   Ethernet based OAM messages, defined in the ITU-T Recommendation
   [G.8113.1], carried in the G-ACh . These Ethernet based OAM messages
   and procedures, address the OAM functional requirements defined in

   This code point may be used on any transport construct that uses the
   G-ACh, e.g., MPLS-TP Sections, MPLS-TP LSPs or PWs. The actual
   applicability of each message to different transport constructs is

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   outside the scope of this document and will be defined in the ITU-T
   Recommendation [G.8113.1].

   All ITU-T Recommendations are subject to revisions. Therefore, the
   code point allocated by this document may be used for future versions
   of [G.8113.1].

3. Security Considerations

   As noted in [RFC5586], when new ACH Types are defined the "security
   considerations must be described in the relevant associated channel
   type." Thus, any specification of messages to be carried on the
   Ethernet OAM ACH Type must include the necessary security
   considerations. The IETF takes this opportunity to remind the ITU-T
   of the need to describe security considerations in [G.8113.1].

4. IANA Considerations

   IANA maintains a registry of Pseudowire Associated Channel Types as a
   subregistry of the Pseudowire Name Spaces registry.

   IANA is requested to allocate a new code point as follows:

      Value        Description              TLV Follows  Reference

      -----------  -----------------------  -----------  ---------

      TBD          Ethernet based OAM         No           [This.I-D]

   A value of 0x8902 is suggested.

5. References

5.1. Normative References

   [RFC5586] Vigoureux, M., Bocci, M., Swallow, G., Ward, D., Aggarwal,
             R., "MPLS Generic Associated Channel", RFC 5586, June 2009

   [RFC5860] Requirements for Operations, Administration, and
             Maintenance (OAM) in MPLS Transport Networks, RFC5860, May

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5.2. Informative References

             Sprecher, N., and Fang, L., "An Overview of the OAM Tool
             Set for  MPLS based Transport Networks", draft-ietf-mpls-
             tp-oam-analysis, work in progress.

             Sprecher, N. and Hong, KY., "The Reasons for Selecting a
             Single Solution for MPLS-TP OAM", draft-sprecher-mpls-tp-
             oam-considerations, work in progress.

   [G.8113.1] Operations, Administration and Maintenance mechanism for
             MPLS-TP in Packet Transport Network (PTN)

   [Y.1731] OAM functions and mechanisms for Ethernet based networks

6. Acknowledgments

   This document was prepared using 2-Word-v2.0.template.dot.

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Authors' Addresses

   Malcolm Betts

   Email: malcolm.betts@zte.com.cn

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