Re: common method to count traffic volume on IX

[Michael Hallgren <m.hallgren () free fr>]

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Le 17/09/2013 20:15, Patrick W. Gilmore a écrit :
> On Sep 17, 2013, at 12:11 , Martin T <m4rtntns () gmail com> wrote:
>
> > Thanks for all the replies!
> >
> >
> > Nick,
> >
> > counting traffic on inter-switch links is kind of cheating, isn't it?
> > I mean if "input bytes" and "output bytes" on all the ports facing the
> > IX members are already counted, then counting traffic on links between
> > the switches in fabric will count some of the traffic multiple times.
> >
> >
> >
> > Patrick,
> >
> > how does smaller sampling period help to show more traffic volume on
> > switch fabric? Or do you mean that in case of shorter sampling periods
> > the traffic peaks are not averaged out and thus peak in and peak out
> > traffic levels remain higher?

Hi,

Good reading, to get an idea:

https://www1.ethz.ch/csg/people/dimitroc/papers/p95pam.pdf

Section 3, mainly.

Cheers,

mh

> >
>
> The graph has a bigger peak, and DE-CIX has claimed "see, we are
bigger" using such graphs. Not only did they not caveat the fact they
were using a non-standard sampling method, they have refused to change
when confronted or even say what their traffic would be with a 300
second timer.
>

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