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
[email protected]
https://www1.ietf.org/mailman/listinfo/pce
.
_______________________________________________
Pce mailing list
[email protected]
https://www1.ietf.org/mailman/listinfo/pce
