Internet Engineering Task Force (IETF) M. Betts
Request for Comments: 6671 ZTE
Category: Informational November 2012
Allocation of a Generic Associated Channel Type for ITU-T
MPLS Transport Profile Operation, Maintenance, and Administration
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
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
The IESG notes that the IETF has developed a set of OAM tools for
MPLS-TP that have been published as Standards Track RFCs. A list of
the relevant RFCs can be found in RFC 6669. The approval of this
document and the assignment of an ACh Type does not constitute
endorsement by the IETF of the alternate MPLS-TP OAM documented in
G.8113.1. The IESG recommends instead that the RFCs noted above
should be implemented.
Betts Informational [Page 1]RFC 6671 G-ACh Type for G.8113.1 OAM November 2012Copyright Notice
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described in the Simplified BSD License.
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 [RFC6669] 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, IANA has assigned a G-ACh Type <0x8902> for
use by the ITU-T for [G.8113.1]. This G-ACh Type is 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 [RFC6670].
Betts Informational [Page 2]RFC 6671 G-ACh Type for G.8113.1 OAM November 20122. Conventions Used in This Document2.1. 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].
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, as defined in the ITU-T Recommendation [G.8113.1], carried
in the G-ACh. The OAM messages and procedures carried behind this