Hi All,
As noted during the NETMOD session today, the BBF has sent a liaison
regarding their new project for Addressing ONU Management at Scale.
While not yet posted to IETF Statements
<https://datatracker.ietf.org/liaison/>, the liaison has the content
below and as noted in the meeting today, should have a response.
In the coming days, I'll be drafting the response on behalf of the
Chairs. Input is welcome.
Please let me know if you have questions
Thanks,
Dave Sinicrope
IETF Liaison Manager for the Broadband Forum
From the Chair's slides:
Liaisons and Communications
Incoming:
– From:Broadband Forum
– Received: 2023-03-09
– Title: New Project for Addressing ONU Management at Scale
– The Broadband Forum Fiber Access Networks (FAN) Work Area recently
agreed to initiate a new project for the optimization of management of
Optical Network Units (ONU) at scale. This project, called WT-505: ONU
Management at Scale, is intended to be an enhancement of the existing
specification, TR-385: ITU-T xPON YANG Modules. The following describes
the issues and considerations that led to the need for the new project.
– See list for attachment
Liaison content:
*Broadband Forum Liaison To: *
Kent Watsen, IETF NETMOD WG Co-Chair, <[email protected]>
Lou Berger, IETF NETMOD WG Co-Chair, <[email protected]>
Scott Mansfield, ITU-T Q14/15 Rapporteur, <[email protected]>
Liping Chen, ITU-T Q14/15 Associate Rapporteur, <[email protected]>
Paul Nikolich, IEEE 802 Chair, <[email protected]>
Glenn Parsons, IEEE 802.1 Chair, <[email protected]>
Jessy Rouyer, IEEE 802.1 Vice Chair, <[email protected]>
David Law, IEEE 802.3 Chair, <[email protected]>
Adam Healey, IEEE 802.3 Vice Chair, <[email protected]>
*From:*
Lincoln Lavoie
Broadband Forum Technical Committee Chair <[email protected]>
*Liaison Communicated* *By:*
Ken Ko
Broadband Forum Managing Director <[email protected]>
*Date:* 8^th June 2023
*Subject:* For Information: New Project for Addressing ONU Management at
Scale
The Broadband Forum Fiber Access Networks (FAN) Work Area recently
agreed to initiate a new project for the optimization of management of
Optical Network Units (ONU) at scale. This project, called WT-505: ONU
Management at Scale, is intended to be an enhancement of the existing
specification, TR-385: ITU-T xPON YANG Modules. The following describes
the issues and considerations that led to the need for the new project.
In contrast to many other transport technologies, a single PON interface
can multiplex as many as 128 ONUs. It is also typical for a single
Optical Line Termination (OLT) to contain many such PON interfaces.
At this level of dimensioning, the OLT YANG modeled configuration data
becomes very large due to the high number of ONUs to be managed. With
current TR-385 and TR-383 Broadband Forum YANG models, the management of
large OLTs suffers severe performance degradation. Examples of such
degradation are:
·Time to validate YANG constraints when configuring ONU data nodes
(e.g., due to very large OLT interface and hardware component lists)
·Time to delete an ONU (time to retrieve all data nodes of the ONU)
·Time to perform a <copy-config> of a full OLT configuration.
Many Broadband Forum contributions have been submitted and discussed
that demonstrate ONU management needs to be optimized to keep the OLT
manageable. It has been determined that efficient optimization of ONU
management requires the following measures:
·Collocate ONU data nodes per ONU, rather than have them interleaved
with OLT data nodes (e.g., in the same interface or hardware component
list) as per TR-385. This involves defining a list of ONUs in the OLT
where each ONU entry contains all ONU data nodes.
·Bring a strong reduction of the configuration data size per ONU. This
will be achieved using ONU templates combined with the use of shared ONU
profiles.
IETF schema mount was considered as a solution for collocating ONU data
nodes. There were drawbacks to this approach, however. The size of the
datastore was not improved as the same data nodes are mounted per ONU.
There is also a known lack of tooling that supports schema mount making
it difficult for this solution to be broadly implemented in a timely
manner. The following alternative has been agreed upon.
Complement current standard YANG models with new models that implement
optimization measures for the data nodes applicable to ONU devices.
These current models are found in Broadband Forum standards, e.g.,
TR-355, TR-383, TR-385, and standards from other organizations, e.g.,
IETF, IEEE, ITU-T.
This involves:
·Deriving from existing standard modules, the development of modules
defining a list of ONU templates.
·Deriving from existing standard modules, the development of modules
defining a list of ONU instances, where each instance refers to one or
more ONU templates and gives the possibility to complement or overrule
any data originating from templates.
·Deriving from existing standard modules, the definition of modules
defining ONU profiles that can be shared between ONUs templates and
instances. ONU profiles should be distinct from OLT profiles to allow
validation rules that are specific to ONUs.
Deriving from existing standard modules means the modules will not be
used as written. Rather, applicable portions of those modules are copied
into new modules defining templates, profiles, etc. The modules
developed in this project will reference the source YANG modules and
specifications, and provide any license text as required by the source
organization.
Sincerely,
Lincoln Lavoie,
Broadband Forum Technical Committee Chair
**
*CC:*
Liaisons at BBF <[email protected]>
Lincoln Lavoie, Broadband Forum Technical Committee Chair
<[email protected]>
Ken Ko, Broadband Forum Managing Director <[email protected]>
April Nowicki, Broadband Forum Member Support Manager
<[email protected]>
Marta Seda, Broadband Forum FAN Work Area Director <[email protected]>
Joey Boyd, Broadband Forum PON Management Project Stream Leader
<[email protected]>
**
*Broadband Forum Reference: *LIAISE-595**
**
*Date of Upcoming Broadband Forum* *Meetings: *See
https://www.broadband-forum.org/category_meetings_and_events/upcoming-meetings
**
_______________________________________________
netmod mailing list
[email protected]
https://www.ietf.org/mailman/listinfo/netmod
