Re: [CCAMP] Connectivity-matrix in YANG models for WSON devices

Leeyoung <leeyoung@huawei.com> Fri, 21 July 2017 13:11 UTC

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From: Leeyoung <leeyoung@huawei.com>
To: Dieter Beller <Dieter.Beller@nokia.com>, "ccamp@ietf.org" <ccamp@ietf.org>
Thread-Topic: [CCAMP] Connectivity-matrix in YANG models for WSON devices
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Date: Fri, 21 Jul 2017 13:11:42 +0000
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Subject: Re: [CCAMP] Connectivity-matrix in YANG models for WSON devices
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Hi Dieter,

Please see inline for my comment.

Thanks.
Young

From: CCAMP [mailto:ccamp-bounces@ietf.org] On Behalf Of Dieter Beller
Sent: Friday, July 21, 2017 1:20 PM
To: ccamp@ietf.org
Subject: [CCAMP] Connectivity-matrix in YANG models for WSON devices

Hi CCAMPers,

during the joint session an YANG and the CCAMP session yesterday, I commented that the following two drafts are defining a connectivity matrix in the
YANG models for WSON devices:
https://datatracker.ietf.org/doc/draft-ietf-ccamp-wson-yang/
https://datatracker.ietf.org/doc/draft-vergara-ccamp-flexigrid-yang/

I was suggesting to have a look at the definition of the connectivity-matrix in https://datatracker.ietf.org/doc/draft-ietf-teas-yang-te-topo/ and re-use
that definition unless there are good reasons to define the connectivity matrix for WSON devices differently.
YL>> We have not finished the model. We will add a few items to the Conn. Matrix which are physical layer specific information augmentation. I can foresee the ports/interfaces in and out of the device may be associated with FEC/Modulation constraints and other impairment aspect as well. I also foresee within a device, we may have embedded resource pool models, etc. But as you say, anything has defined in the TE-topo will be augmented and we will only describe additional properties peculiar to optical.

Moreover, the connectivity-matrix of a WSON device (e.g. a ROADM) typically reflects the connectivity limitations of the wavelength selective switching
fabric of the device and hence should be read-only (ro) as opposed to read-writable (rw). Why would an operator further restrict  the connectivity
capabilities of a WSON device?
YL>> With the physical data added, there may be administrative issues where some restriction would apply. We don’t have specific use-case at this moment, but leaving +rw may be sensible thing.


Thanks,
Dieter