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Re: [Pce] My Comment on draft-lee-pce-flexible-grid

Leeyoung <leeyoung@huawei.com> Thu, 20 July 2017 08:42 UTC

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From: Leeyoung <leeyoung@huawei.com>
To: Julien Meuric <julien.meuric@orange.com>, "pce@ietf.org" <pce@ietf.org>, "draft-lee-pce-flexible-grid@ietf.org" <draft-lee-pce-flexible-grid@ietf.org>
Thread-Topic: My Comment on draft-lee-pce-flexible-grid
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Date: Thu, 20 Jul 2017 08:41:15 +0000
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Subject: Re: [Pce] My Comment on draft-lee-pce-flexible-grid
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Hi Julien,

I agree. A New flag on the object header (WA Object, I assume that is what you are pointing to) where we have a flag to indicate if this is fixed (WSON) or flexi-grid is reasonable instead of creating a new object for a new Spectrum Assignment Object.

TLVs require a bit different encoding due to the nature of additional parameters for flexi-grid. So strict re-use of WSON TLV may not be sufficient for some cases in flexi-grid. 

Best regards,
Young

-----Original Message-----
From: Julien Meuric [mailto:julien.meuric@orange.com] 
Sent: Thursday, July 20, 2017 10:28 AM
To: pce@ietf.org; draft-lee-pce-flexible-grid@ietf.org
Subject: My Comment on draft-lee-pce-flexible-grid

Hi,

The discussion during the meeting suggests that I need to clarify my comment about draft-lee-pce-flexible-grid.

This I-D is very similar to draft-ietf-pce-wson-rwa-ext, which addresses the exact same problem over a slightly different WDM label space (running a side-by-side diff between them appears to be very practical).
This new I-D requests the creation of one object and 3 TLVs, which are identical to the ones created in the WSON.
As a result, I believe the latter should be reused as a starting popint.
Covering the flexi-grid case may just need to allocate new flag in the object header to identify the WDM type we're dealing with, and document the flexi-grid-specific assumptions (if any).

Thanks,

Julien

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