Hi Meral,

On May 24, 2006, at 12:46 PM, Meral Shirazipour wrote:

Dear Adrian,
   I apologize for the lack of clarity in my previous comment. I think Lucy has
a point. But I do not think the draft needs to me modified.
My comment on “the applicability of the PCE architecture in the Internet at
large” comes from the following lines in the Description of Working Group.

I was referring to:
“The PCE WG will work on application of this model within a single
domain
or within a small group of domains (where a domain is a layer, IGP area
or Autonomous System with limited visibility from the head-end LSR).
At this time, applying this model to large groups of domains such as
the
Internet is not thought to be possible, and the PCE WG will not spend
energy on that topic.”

This said, I think if our ultimate goal is to do inter-AS TE and path
optimization in a PCE-based architecture, we must consider TED updating issues
and PCE signaling responsiveness while we are still at the definition stage of
the architecture and signaling protocols.

Both items are indeed important.

TED update: do you see any reason to change the way the TED is updated by the IGP in a PCE context ?
Note that so called "distributed CSPF approach" is a specific instantiation of the PCE (LSR and PCE co-resident).

PCEP communication responsiveness: this is an key metric indeed that is been considered during the protocol design (in line with the requirement IDs). Note also that there's a WG item related to "Objective metrics" for which several expressed some interest. We can expect some work to be done in this area and you're obviously very welcome to contribute.

- Definition of objective metrics to evaluate various criteria such as
the measurement of path quality, response time, robustness and
scalability of path computation models.

Thanks.

JP.


Best regards,
  Meral Shirazipour



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