Internet DRAFT - draft-betts-itu-oam-ach-code-point
draft-betts-itu-oam-ach-code-point
Network Working Group M. Betts
Internet Draft ZTE
Intended status: Informational April 10, 2012
Expires: October 10, 2012
Allocation of a Generic Associated Channel Type for ITU-T MPLS
Transport Profile Operation, Maintenance, and Administration
(MPLS-TP OAM)
draft-betts-itu-oam-ach-code-point-04.txt
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Abstract
This document assigns a Generic Associated Channel (G-ACh) Type for
carrying ITU-T MPLS Transport Profile Operations, Administration, and
Management (MPLS-TP OAM) messages in the MPLS Generic Associated
Channel.
1. Introduction
The Transport Profile of MPLS (MPLS-TP) defined in [RFC5654] 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 used to meet the OAM
functional requirements defined in [RFC5860].
ITU-T Recommendation [G.8113.1] documents MPLS-TP OAM. This
Recommendation builds upon Ethernet OAM as documented in [Y.1731].
The messages in [G.8113.1] are defined to be carried in a new
Generic Associated Channel (G-ACh) Type in the MPLS Generic
Associated Channel. In order to carry these messages in an
interoperable fashion, a Generic Associated Channel Type from the
IANA maintained registry "Pseudowire Associated Channel Types'' is to
be used.
To fulfill the request from ITU-T SG15 in [LS370] and to allow
deployment of the [G.8113.1] OAM solution without using an
experimental G-ACh Type, this document requests IANA to assign a G-
ACh Type for use by the ITU-T for [G.8113.1]. This G-ACh type shall
be known as the G.8113.1 OAM G-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. Conventions used in this document
2.1. Requirements notation
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
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3. Scope of the G.8113.1 OAM G-ACh Type
The G-ACh Type assigned by this document MUST only be used for OAM
messages, defined in the ITU-T Recommendation [G.8113.1], carried in
the G-ACh. The OAM messages and procedures carried behind this G-ACh
type, are restricted to only those that address the OAM functional
requirements defined in [RFC5860]. Other message types MUST NOT be
carried behind this G-ACh type.
All ITU-T Recommendations are subject to updates by errata,
corrigenda, amendments or complete revisions. In any update of
[G.8113.1] the G-ACh Type assigned by this document MUST NOT be used
for any functions not identified as OAM functional requirements in
[RFC5860]. An update of [G.8113.1] may use the G-ACh Type assigned
by this document to support the OAM functions identified in
[RFC5860]. When an amendment or complete revision of G.8113.1 is
approved the reference to [G.8113.1], provided in this document,
should be updated to show the approval date of the new version.
The G-ACh Type assigned by this document may be used on any
transport construct that uses the G-ACh, e.g., MPLS-TP Sections,
MPLS-TP LSPs or PWs as described in [G.8113.1].
4. Security Considerations
As noted in [RFC5586], when new G-ACh Types are defined, the
"security considerations MUST be described in the relevant
associated channel type specification." The IETF takes this
opportunity to remind the ITU-T of the need to describe security
considerations in [G.8113.1].
5. 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 G-ACh Type as follows:
Value Description TLV Follows Reference
----------- ----------------------- ----------- ---------
TBD G.8113.1 OAM No [This.I-D]
A value of 0x8902 is suggested.
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6. References
6.1. Normative References
[RFC2119] Key words for use in RFCs to Indicate Requirement Levels,
BCP 14, RFC 2119, March 1997
[RFC5586] MPLS Generic Associated Channel, RFC 5586, June 2009
[RFC5654] Requirements of an MPLS Transport Profile, September 2009
[RFC5860] Requirements for Operations, Administration, and
Maintenance (OAM) in MPLS Transport Networks, RFC5860, May
2010
[G.8113.1] ITU-T Recommendation ''Operations, Administration and
Maintenance mechanism for MPLS-TP in Packet Transport
Network (PTN)'' 10/12,
http://www.itu.int/rec/T-REC-G.8113.1/en
(Note to RFC editor: This link will become valid after
G.8113.1 is approved)
[Y.1731] ITU-T Recommendation ''OAM functions and mechanisms for
Ethernet based networks'' 7/2007 as updated by Corrigendum
1, 10/2011, http://www.itu.int/rec/T-REC-Y.1731/en
6.2. 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.
7. Acknowledgments
This document was prepared using 2-Word-v2.0.template.dot.
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Author's Address
Malcolm Betts
ZTE
Email: malcolm.betts@zte.com.cn
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