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

Jorge E. López de Vergara Méndez <jorge.lopez_vergara@uam.es> Fri, 21 July 2017 15:01 UTC

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Subject: Re: [CCAMP] Connectivity-matrix in YANG models for WSON devices
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     Hi Dieter, all,

     I agree with the comments provided by Young. In any case, for the 
following version we will see how to augment the matrix from 
draft-ietf-teas-yang-te-topo.

     Best regards,

     -Jorge


El 21/07/2017 a las 15:11, Leeyoung escribió:
>
> 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
>
>
>
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-- 
__     _         __   __  Jorge E. López de Vergara Méndez, Ph.D.
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