Re: [CCAMP] Objective function draft
Julien Meuric <julien.meuric@orange.com> Mon, 17 September 2012 13:37 UTC
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Date: Mon, 17 Sep 2012 15:37:25 +0200
From: Julien Meuric <julien.meuric@orange.com>
Organization: France Telecom
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To: "George Swallow (swallow)" <swallow@cisco.com>
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Subject: Re: [CCAMP] Objective function draft
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Hi George. Sorry for the late response. You are right: the minutes are not enough to trace the full discussion (which we also resumed right after the meeting). Let us start by thanking Adrian (as AD? former PCE co-chair? author of... ;-) ) for bringing the PCE-associated vocabulary to a common understanding. Actually my concern is sustained by 2 points: 1- The scope of the draft is about giving control of the routing objective function to the client node facing a transport layer. I see already several existing solution to achieve it: - a PCEP request from the signaling head node is an option (which is associated to the advertisement of the supported objectives in PCEP); - building IGP adjacencies between client and transport edge nodes (a.k.a. "border model") is another one. In this context, it do not think extending RSVP-TE for this kind of application is worth the effort, since the requirement can already be addressed. 2- There are cases when previous options are ruled out of a given deployment. I do believe that it is not simply due to protocol exclusion, but rather to the fact that the SP wants transport routing decisions to remain entirely within the transport network (in order to fully leave the routing policy in the hands of people doing the layer dimensioning). Thus, I feel this trade-off in path selection tuning is rather unlikely to happen and I fear we may be talking about RSVP-TE over-engineering here. (That is also why I preferred to consider your I-Ds separately during the CCAMP meeting.) However, my comments are mostly related to the client/transport relationship. If the I-D is extended to cover more use cases with wider scopes (Adrian has made interesting suggestions), turning the overlay interconnection into one among a longer list, then my conclusion may be different. Regards, Julien Le 11/09/2012 21:28, George Swallow (swallow) a écrit : > Julien - > > Reading the CCAMP notes (which capture little of the actual > discussion) I see that there may have been a perception in the room > that PCE functionality at the UNI-N was assumed (actual or proxy). > > This is not the case. The reason for our draft is that with the UNI, > much of the functionality that resides at the headend is moved to the > UNI-N. So the UNI-C needs a way to express an objective function even > if there is no PCE. > > Operationally it seems burdensome to require a PCEP at the UNI-C and a > PCEP at the UNI-N, when all that is being done is enabling the UNI-N > to perform what the client would do if it were connected to the > network via a normal link. > > Do you still object to the draft? > > Thanks, > > …George
- Re: [CCAMP] Objective function draft George Swallow (swallow)
- [CCAMP] Objective function draft George Swallow (swallow)
- Re: [CCAMP] Objective function draft Adrian Farrel
- Re: [CCAMP] Objective function draft George Swallow (swallow)
- Re: [CCAMP] Objective function draft Daniele Ceccarelli
- Re: [CCAMP] Objective function draft Julien Meuric
- Re: [CCAMP] Objective function draft George Swallow (swallow)
- Re: [CCAMP] Objective function draft Dieter Beller
- Re: [CCAMP] Objective function draft Gert Grammel
- Re: [CCAMP] Objective function draft Dieter Beller
- Re: [CCAMP] Objective function draft Julien Meuric
- Re: [CCAMP] Objective function draft Daniele Ceccarelli
- Re: [CCAMP] Objective function draft Julien Meuric
- Re: [CCAMP] Objective function draft JP Vasseur (jvasseur)
- [CCAMP] R: Objective function draft BELOTTI, SERGIO (SERGIO)
- Re: [CCAMP] Objective function draft George Swallow (swallow)
- Re: [CCAMP] Objective function draft Vishnu Pavan Beeram
- Re: [CCAMP] Objective function draft Ong, Lyndon
- Re: [CCAMP] Objective function draft Igor Bryskin
- Re: [CCAMP] Objective function draft John E Drake
- Re: [CCAMP] UNI/NNI (was: Objective function draf… Julien Meuric
- Re: [CCAMP] UNI/NNI (was: Objective function draf… Daniele Ceccarelli
- Re: [CCAMP] Objective function draft Gert Grammel
- Re: [CCAMP] Objective function draft John E Drake
- Re: [CCAMP] UNI/NNI Julien Meuric
- Re: [CCAMP] Objective function draft Lou Berger
- Re: [CCAMP] Objective function draft Julien Meuric
- Re: [CCAMP] Objective function draft John E Drake
- Re: [CCAMP] Objective function draft Julien Meuric
- Re: [CCAMP] Objective function draft Igor Bryskin
- Re: [CCAMP] Objective function draft Gert Grammel
- Re: [CCAMP] Objective function draft Lou Berger
- Re: [CCAMP] Objective function draft Igor Bryskin
- Re: [CCAMP] Objective function draft Lou Berger
- Re: [CCAMP] Objective function draft Dieter Beller
- Re: [CCAMP] Objective function draft John E Drake
- Re: [CCAMP] Objective function draft Igor Bryskin