Re: [CCAMP] draft-ali-ccamp-rc-objective-function-metric-bound-03.txt

"Zafar Ali (zali)" <> Fri, 09 August 2013 16:52 UTC

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From: "Zafar Ali (zali)" <>
To: Fatai Zhang <>, John E Drake <>, "CCAMP (" <>
Thread-Topic: [CCAMP] draft-ali-ccamp-rc-objective-function-metric-bound-03.txt
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Date: Fri, 9 Aug 2013 16:46:16 +0000
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Subject: Re: [CCAMP] draft-ali-ccamp-rc-objective-function-metric-bound-03.txt
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Hi John/ Fatai-

ERO expansion is an already supported functionality since early days of
RSVP-TE and is widely deployed. There is a new requirement to convey
latency bound in TE networks. Hence a very simple and logical extension in
RSVP TE to support the newly defined TE (latency) metrics.

If we go with your logic, any operator that wants to deploy latency metric
will be forced to deploy a PCE (including in the existing deployments)
which is a no-go. Especially given the RSVP TE extensions are so simple.

Latency is an important "traffic engineering" metric and suggesting not to
support it in RSVP-TE ("traffic engineering") is much odd. If we go with
your logic, we should just simply retire RSVP-TE and FORCE every SP to
deploy PCE (in addition of RSVP-TE) for TE.


Regards Š Zafar

-----Original Message-----
From: Fatai Zhang <>
Date: Thursday, August 8, 2013 10:04 PM
To: "" <>et>, ""
Subject: Re: [CCAMP]

>Hi John,
>Completely agree. 
>I also raised this comment in front of the mic during Berlin meeting.
>Best Regards
>-----Original Message-----
>From: [] On Behalf Of
>John E Drake
>Sent: Friday, August 09, 2013 1:49 AM
>To: CCAMP (
>Subject: [CCAMP] draft-ali-ccamp-rc-objective-function-metric-bound-03.txt
>I have a real concern with this draft because it appears to be heading us
>down the road of re-inventing PCEP in RSVP signaling with the dubious
>justification that it is needed in those situations in which a PCE is not
>available.  However, if you re-invent PCEP in RSVP signaling, then you
>have effectively ensured that there are no situations in which a PCE or
>its signaling equivalent are not available.
>Why is this better than simply ensuring that a PCE is available in those
>situations in which it is needed?
>Yours Irrespectively,
>CCAMP mailing list
>CCAMP mailing list