Subject: RE: [Pce] different version support for PCC-PCE communication?

From: "Don Fedyk" <[email-masked]>
Date: Mon, 25 Apr 2005 11:14:42 -0400

Hi Alia

I agree with the requirements. 
Perhaps the PCC/PCE should specify constraints as mandatory and optional (or
ordered/weighted). 
Constraints Can be exclusive, inclusive, minimizing or maximizing etc. 
In the past dealing with multiple minimization/maximization constraints has
been more difficult. An ordering or weight option might help. 

Regards,
Don

> -----Original Message-----
> From: [email-masked] 
> [mailto:[email-masked]] On Behalf Of Alia Atlas
> Sent: Monday, April 25, 2005 1:22 AM
> To: [email-masked]
> Subject: [Pce] different version support for PCC-PCE communication?
> 
> 
> There are naturally requirements for extensibility and policy 
> considerations such that different constraints can be 
> specified - and some 
> such constraints may not be considered at the initial time of 
> protocol design.
> 
> For incremental deployability of such new constraints, there 
> may want to be 
> a requirement describing the required interactions to handle unknown 
> constraints and capabilities.  For instance, does the PCE advertise 
> capabilities that define all the constraints the PCC is allow 
> to use?  In 
> such a case, if a PCC doesn't understand a capability, the 
> PCC should be 
> able probably to ignore one capability and consider the others.
> 
> Thoughts?
> 
> Alia
> 
> 
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