Re: [CCAMP] Vendor-Specific Application Code in draft-ietf-ccamp-rwa-wson-encode

Huub van Helvoort <huubatwork@gmail.com> Thu, 29 January 2015 13:49 UTC

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Date: Thu, 29 Jan 2015 14:49:12 +0100
From: Huub van Helvoort <huubatwork@gmail.com>
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Cc: ccamp@ietf.org, ccamp-chairs@tools.ietf.org, draft-ietf-ccamp-rwa-wson-encode.all@tools.ietf.org
Subject: Re: [CCAMP] Vendor-Specific Application Code in draft-ietf-ccamp-rwa-wson-encode
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All,

I agree with Adrians assessment.

+1 for option 2.

Regards, Huub.

========
On 29-01-15 14:23, Adrian Farrel wrote:
> Hi again,
>
>> There is always a priori knowledge in optical network domain as to who
>> are you interfacing with. So you know which vendor you are interfacing.
>> If you do not know, then you are in trouble.
>
> Hmmm. It is exactly type of trouble we are trying to detect and protect against.
>
> I refute your statement of a priori knowledge. I think there is a priori intention, but not knowledge. Unless you have very good eyesight or someone at the other end of the fiber when you give it a tug, you don't know. And even then. Fibering errors happen from time to time. Consider, in particular a patch panel.
>
>> Now, what is the purpose of standard FECs and modulations in the AI? Given
>> several choices each vendor may support in its device, the path computation
>> would find a matched types for FEC and modulation for a given optical path.
>> This is what is intended when optical signal processing constraints were
>> proposed as part of path computation constraints in optical networks.
>
>
> The case you are making here is for no standard control plane!
> What is the point of standardising if there is never any interworking?
> But actually, we know about interworking at the physical layer, and (more important) we know about a single, end-to-end control plane that spans multiple vendor devices. It all exists.
>
> Of course, we can fall back into the old-style vendor islands, and many like to do so. But it is not a compulsory deployment model.
>
>> There is very little chance for vendor specific FECs and Modulations will match
>> even if they are identified with the OUI code.
>
> You have it the wrong way round!
> The OUI is largely to protect against expectations of interworking when none can exist.
> It might (much less frequently) be used to describe the way that vendorA and vendorB pick FECs and modulations in order to achieve interworking.
>
> Adrian
>
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