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Liaison statement
Liaison response to ITU-T SG15 and MEF on YANG for CFM

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State Posted
Submitted Date 2017-06-19
From Group IEEE-802-1
From Contact Glenn Parsons
To Group OPS
To Contacts Warren Kumari <>
Benoit Claise <>
Cc Benoit Claise <>
Eric Gray <>
The IETF Chair <>
Warren Kumari <>
Response Contact Paul Nikolich <>
Glen Parsons <>
John Messenger <>
Purpose For information
Attachments liaison-response-CFM-YANG-0517-v01
We are thankful for the MEF Forum and ITU-T SG15 liaison responses to our March
16, 2017 liaison on progressing information and data modeling for Ethernet OAM.
We are appreciative of MEF Forum and ITU-T SG15 expressions of support for, and
acceptance of our proposal.

We also took MEF Forum and ITU-T SG15 feedback into consideration during the
development at our May 2017 interim meeting of the Project Authorization
Request for a new IEEE 802.1 project 802.1Qcx “YANG Data Model for Connectivity
Fault Management”. As such, we plan for project 802.1Qcx to: • Specify a UML
information model and YANG data model for IEEE Std 802.1Q-specified CFM
compatible with naming conventions used in IEEE 802.1, ITU-T SG15 and MEF
Forum; • Cover OpCode values 0-31 and 96-255 per ITU-T SG15 proposal as we also
agree that YANG modules should be developed within the organization that has
responsibility for the corresponding protocol; • Specify YANG modules providing
as much independence as possible from the underlying data plane to allow
applicability over the various transport networks that can support an Ethernet
service; • Be developed taking as input MEF 38 and MEF 39, as well as the
corresponding errata that MEF previously identified and communicated to us; •
Be progressed following the IEEE 802 standard development process and leverage
GitHub ( in
support of agile and collaborative development of the modules to be integrated
in the final specification.

Regarding the MEF Forum work above the Network Element level that could have
overlap in the objects and parameters with our work, we will share our work as
it progresses to facilitate alignment.

We look forward to joint participation in the development of information and
data modeling for CFM. IEEE 802.1 meets next 10-13 July 2017 in Berlin, Germany
and 5-8 September 2017 in St. John’s, Newfoundland, Canada.