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Re: [CCAMP] I-D Action: draft-ietf-ccamp-flexible-grid-ospf-ext-01.txt

Lou Berger <lberger@labn.net> Wed, 04 March 2015 13:12 UTC

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Date: Wed, 04 Mar 2015 08:12:15 -0500
From: Lou Berger <lberger@labn.net>
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To: Daniele Ceccarelli <daniele.ceccarelli@ericsson.com>, Ramon Casellas <ramon.casellas@cttc.es>, Rajan Rao <rrao@infinera.com>, "adrian@olddog.co.uk" <adrian@olddog.co.uk>, "'Zhangxian (Xian)'" <zhang.xian@huawei.com>, 'CCAMP' <ccamp@ietf.org>
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Cc: Iftekhar Hussain <IHussain@infinera.com>
Subject: Re: [CCAMP] I-D Action: draft-ietf-ccamp-flexible-grid-ospf-ext-01.txt
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On 03/04/2015 07:23 AM, Daniele Ceccarelli wrote:
> Hi Lou,
> 
> Section 2.4.4 of RFC4202 says:
> 
>    The additional information includes Reservable Bandwidth per
>    priority, which specifies the bandwidth of an LSP that could be
>    supported by the interface at a given priority number.
> 
> And 3.7, for example, says:
> 
>       Interface Switching Capability Descriptor:
>          Interface Switching Capability = LSC
>          Encoding = Lambda (photonic)
>          Reservable Bandwidth = Determined by optical technology limits
> 
> It is all about the bitrate of a lambda, not the amount of spectrum that a lambda can take. I think these are two different dimensions on the problem. Aren't they?
> I would say that RFC4202 comes into play when we speak about the signal layer rather than the media layer.
> 

I think we've been here before.  Consider the cases of waveband switches
or mems+awg, both of which switched/covered ranges of the spectrum...

Lou

> Daniele
> 
> 
>> -----Original Message-----
>> From: Lou Berger [mailto:lberger@labn.net]
>> Sent: mercoledì 4 marzo 2015 13:08
>> To: Daniele Ceccarelli; Ramon Casellas; Rajan Rao; adrian@olddog.co.uk;
>> 'Zhangxian (Xian)'; 'CCAMP'
>> Cc: Iftekhar Hussain
>> Subject: Re: [CCAMP] I-D Action: draft-ietf-ccamp-flexible-grid-ospf-ext-
>> 01.txt
>>
>> Daniele,
>>
>> On 3/4/2015 6:53 AM, Daniele Ceccarelli wrote:
>>>
>>> Hi Ramon,
>>>
>>>
>>>
>>> Yes, I think that was implicitly clear. BTW just to be sure, let's
>>> call it frequency slot slot width, chunck of spectrum or water.just to
>>> make it explicit.
>>>
>>>
>>>
>>> My point regards the quote of RFC4202 and RFC4203 where bandwidth
>>> means bandwidth and not portions of the spectrum.
>>>
>>>
>>>
>>
>> I'm not sure what you mean.  In the generic portion of the advertisements
>> defined in 4202/3, the available lambdas/timeslots/etc (and perhaps now
>> spectrum) have always been advertised as aggregate BW.
>>
>> Lou
>>
>>> Daniele
>>>
>>
> 
>

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