[CCAMP] Fwd: slides for draft-ietf-ccamp-flexi-grid-fwk-01

Oscar González de Dios <ogondio@tid.es> Wed, 05 March 2014 13:53 UTC

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Subject: [CCAMP] Fwd: slides for draft-ietf-ccamp-flexi-grid-fwk-01
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FYI

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Inicio del mensaje reenviado:

De: Maarten vissers <maarten.vissers@huawei.com<mailto:maarten.vissers@huawei.com>>
Fecha: 5 de marzo de 2014 13:47:43 GMT
Para: Ramon Casellas <ramon.casellas@cttc.es<mailto:ramon.casellas@cttc.es>>, "fu.xihua@zte.com.cn<mailto:fu.xihua@zte.com.cn>" <fu.xihua@zte.com.cn<mailto:fu.xihua@zte.com.cn>>, Iftekhar Hussain <IHussain@infinera.com<mailto:IHussain@infinera.com>>
Cc: Daniele Ceccarelli <daniele.ceccarelli@ericsson.com<mailto:daniele.ceccarelli@ericsson.com>>, "Malcolm.BETTS@zte.com.cn<mailto:Malcolm.BETTS@zte.com.cn>" <Malcolm.BETTS@zte.com.cn<mailto:Malcolm.BETTS@zte.com.cn>>, Oscar González de Dios <ogondio@tid.es<mailto:ogondio@tid.es>>, "Zhangxian (Xian)" <zhang.xian@huawei.com<mailto:zhang.xian@huawei.com>>, Fatai Zhang <zhangfatai@huawei.com<mailto:zhangfatai@huawei.com>>
Asunto: RE: slides for draft-ietf-ccamp-flexi-grid-fwk-01

Hi Ramon,

A GMPLS LSP per network media channel is indeed **not** the right approach.

The GMPLS LSP has to represent the one optical channel layer connection that carries the complete OTUCn and thus encompasses all the associated network media channels; this GMPLS LSP is to be signaled with a list of frequency slots that are occupied by this optical channel layer connection. I.e. use an approach that is similar to the approach for signaling the set up of a multi-time slot ODUk connection.
See also Xihua’s email which was CC’ed to ccamp.

As you already know how to signal a multi-time slot ODUk connection, you essentially know how to signal a multi-frequency slot optical channel layer connection. The main difference is that a frequency slot is defined by a <nominal center frequency and slot width>-tuple and not by a simple <slot number> as in the ODUk case.

Regards,
Maarten

From: Ramon Casellas [mailto:ramon.casellas@cttc.es]
Sent: woensdag 5 maart 2014 08:29
To: Maarten vissers; fu.xihua@zte.com.cn<mailto:fu.xihua@zte.com.cn>; Iftekhar Hussain
Cc: Daniele Ceccarelli; Malcolm.BETTS@zte.com.cn<mailto:Malcolm.BETTS@zte.com.cn>; Oscar González de Dios; Zhangxian (Xian); Fatai Zhang
Subject: Re: slides for draft-ietf-ccamp-flexi-grid-fwk-01

El 05/03/2014 0:33, Maarten vissers escribió:
Ramon,

My suggestion is to focus on the optical channel layer connection and not on the media channel as described in my response to Xihua about an hour ago. An optical channel layer connection encompasses one or more network media channels. You have to configure optical channel layer cross connects in each NE in the computed path. An optical channel layer cross connect connects one or more frequency slots <FS1,FS2,..,FSn> between two or more ports.

Awareness of network media channels is only required in the PCE, during optical channel layer path computation as described in my previous email.

Hi again,


In short, I want to understand whether, provided that the path computation function is able to compute a set of network media channels that are logically associated and that satisfy your constraints (i.e., compute the optical channel layer route), you think that having an LSP per network media channel where the label represents the frequency slot and associating them somehow (the method is still to be defined, channel sets, association, virtual concat, just to echo some terms) is *not* the right approach?

R.

Note: We should  CCccamp as requested in the past by AD & WG chairs to avoid parallel discussions.


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