PCE monitoring doc (was Re: [Pce] IPR PCE Monitoring)

[dimitri papadimitriou <[e-mail]>]

hi j-p

as far as i remember, this doc. is still open for discussion from San 
Diego and Prague mtg discussion.

here below for the record

<http://www3.ietf.org/proceedings/06nov/minutes/pce.txt>

v03 has been reworked but does not provide answer to the concerns 
expressed so far - quoting the doc.

 > In PCE-based environments, it is critical to monitor the state of the

critical for what ? if computation time is an issue why delegate it 
(isn't that the safest assumption ?)

 > path computation chain for troubeshooting and performance monitoring
 > purposes:

troubleshooting of what ? if there is congestion/troubles how would you 
ensure the information received back is accurate ?

 > liveness of each element (PCE) involved in the PCE chain,

if i well remember the PCE is a client-server model (fundamental 
assumption about the PCE approach) hence, why the client needs to know 
the "chain" of PCE servers ?

 > detection of potential resource contention states

a t[0] contention, at t[1] message for perf.mon -> are running 
conditions identical ? since probabilisticaly, not what is the 
expectation behind this mechanism ?

would it be possible to have a "curve" of the deterioration of the 
performance as with an increasing number of computed path the number of 
"monitoring messages" will also increase ?

 > statistics in term of path computation times are examples of such
 > metrics of interest.

interest to who and for which purpose (detection is fine but what is the 
issue to be solved) ? like any system, PCE requires suitable planning 
and dimensioning wrt to perf.objectives i have impression that these 
fundamental design steps are skipped.

let's start discussion with this.

side note: the document states "In this document we call a "state 
metric" a metric that characterizes a PCE state" -> need to define the 
latter.

thanks,
-d.


JP Vasseur wrote:
> Hi,
> 
> Just let you know about an IPR disclosure that has been filed with the 
> IETF in relation to 
> http://tools.ietf.org/id/draft-vasseur-pce-monitoring-03.txt. You can 
> see the disclosure at https://datatracker.ietf.org/ipr/872/ and see the 
> terms offered by the IPR claimant.
> 
> Thanks,
> 
> JP.
> 
> 
> _______________________________________________
> Pce mailing list
> [e-mail]
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> 
> .
> 


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