Network Working Group M. Betts
Internet Draft ZTE
Intended status: Informational February 20, 2012
Expires: August 20, 2012
Allocation of an Associated Channel Code Point for Use by ITU-T
Ethernet based OAM
draft-betts-itu-oam-ach-code-point-03.txt
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Abstract
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 in [LS370] 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].
2. Scope of the Ethernet based OAM ACH Type
The code point allocated by this document is intended to be used only
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
[RFC5860]. Other message types should not be carried behind this code
point.
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.
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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
2010
[G.8113.1] Determined ITU-T draft Recommendation "Operations,
Administration and Maintenance mechanism for MPLS-TP in
Packet Transport Network (PTN)",
https://datatracker.ietf.org/documents/LIAISON/file1307.pdf
[Y.1731] ITU-T Recommendation "OAM functions and mechanisms for
Ethernet based networks" 7/2007 as updated by Corrigendum
1, 10/2011, https://datatracker.ietf.org/liaison/1100/
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5.2. Informative References
[LS370] Liaison statement from ITU-T SG 15,
https://datatracker.ietf.org/liaison/1125/
[I-D.ietf-mpls-tp-oam-analysis]
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.
[I-D.sprecher-mpls-tp-oam-considerations]
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.
6. Acknowledgments
This document was prepared using 2-Word-v2.0.template.dot.
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Authors' Addresses
Malcolm Betts
ZTE
Email: malcolm.betts@zte.com.cn
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