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Liaison statement
Broadband Forum NMDA Questions

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State Posted
Submitted Date 2017-09-20
From Contact Michael Fargano
To Groups netmod, OPS
To Contacts Warren Kumari <>
Benoit Claise <>
Jürgen Schönwälder <>
Tom Nadeau <>
Cc David Sinicrope <>
Kent Watsen <>
Warren Kumari <>
The IETF Chair <>
Lou Berger <>
Benoit Claise <>
Network Modeling Discussion List <>
Response Contact
Purpose For comment
Deadline 2017-11-27 Action Needed
Attachments 41;.final
Dear all,

The Broadband Forum has been considering the impact of NMDA (Network Management
Datastore Architecture) on its YANG work.

Many of our standard and draft YANG modules are dependent on the
ietf-interfaces (RFC 7223) and ietf-hardware (draft-ietf-netmod-entity) YANG
modules, both of which will be impacted by NMDA. Therefore we need to decide
whether (and, if so, how) we should update our published and draft YANG
modules. We see three possible approaches: • Ignore NMDA, relying on the fact
that updated IETF YANG modules will retain backwards compatibility. • Embrace
NMDA, updating all our YANG modules to use single trees (no separate state
trees). • Support NMDA, while retaining backwards compatibility in the same way
as IETF YANG modules will do so.

Our decision will be affected by:
• Our level of confidence that NMDA will be the "last big change" to the way in
which IETF YANG modules are written. • The timescales on which NMDA-compliant
versions of the ietf-interfaces and ietfhardware YANG modules will be published
as RFCs (we note that NMDA-compliant versions of these modules are now

We would much appreciate your feedback on our analysis of the possible
approaches and on our concerns as expressed above.

Michael Fargano
Broadband Forum Technical Committee Chair

David Sinicrope, BBF / IETF Liaison Officer/Manager,
<> Sven Ooghe, BBF Common YANG Project Stream
Leader, <> William Lupton, BBF Common YANG Project Stream
Leader, <wlupton@broadbandforum. org> Robin Mersh, Broadband Forum CEO
<> Gabrielle Bond, Broadband Forum Secretariat
<> Statements at IETF <> Liaisons
at BBF <>

Next Meetings of the Broadband Forum

Reference: LIAISE-83

Attachments: none