Mailing List Archive: Help with setting nProbe sample rate

Help with setting nProbe sample rate

Jul 21, 2017, 9:31 AM

Post #1 of 3 (739 views)

I have the following sample rate configured on a Juniper MX router, I
understand its not ideal and am working on changing it but what would be
the proper --sample-rate setting with nProbe for this? I've tried a few
options and the bandwidth amounts in nProbe still aren't correct.

set forwarding-options sampling input rate 100
set forwarding-options sampling input run-length 9
set forwarding-options sampling input max-packets-per-second 7000
set forwarding-options sampling family inet output flow-inactive-timeout 15
set forwarding-options sampling family inet output flow-active-timeout 60

Thanks,
Ryan

Re: Help with setting nProbe sample rate [ In reply to ]

mainardi at ntop

Jul 24, 2017, 2:14 AM

Post #2 of 3 (737 views)

Permalink

Ryan,

According to your Juniper settings, you have 10 packets (run-length = 9 + sample-triggering-packet = 1) sampled every input-rate=100 packets. Thus, the sampling rate is 10/100 = 10%.

So please use --collector-sample-rate=10

See:
[--collector-sample-rate] <value> | Specify the bytes/pkts collection sample rate (NetFlow only).

Regards,
Simone

> On 21 Jul 2017, at 18:31, Ryan Gelobter <ryan.g@atwgpc.net> wrote:
>
> I have the following sample rate configured on a Juniper MX router, I understand its not ideal and am working on changing it but what would be the proper --sample-rate setting with nProbe for this? I've tried a few options and the bandwidth amounts in nProbe still aren't correct.
>
> set forwarding-options sampling input rate 100
> set forwarding-options sampling input run-length 9
> set forwarding-options sampling input max-packets-per-second 7000
> set forwarding-options sampling family inet output flow-inactive-timeout 15
> set forwarding-options sampling family inet output flow-active-timeout 60
>
> Thanks,
> Ryan
>
>
> _______________________________________________
> Ntop-misc mailing list
> Ntop-misc@listgateway.unipi.it
> http://listgateway.unipi.it/mailman/listinfo/ntop-misc

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Re: Help with setting nProbe sample rate [ In reply to ]

ryan.g at atwgpc

Jul 24, 2017, 11:04 AM

Post #3 of 3 (735 views)

Permalink

Thanks, that worked! I seem to have been looking at a very old version of
the user guide. I couldn't find where it was linked from but its here:
http://www.ntop.org/wp-content/uploads/2013/03/nProbe_UserGuide.pdf

On Mon, Jul 24, 2017 at 4:14 AM, Simone Mainardi <mainardi@ntop.org> wrote:

> Ryan,
>
> According to your Juniper settings, you have 10 packets (run-length = 9 +
> sample-triggering-packet = 1) sampled every input-rate=100 packets. Thus,
> the sampling rate is 10/100 = 10%.
>
> So please use --collector-sample-rate=10
>
> See:
> [--collector-sample-rate] <value> | Specify the bytes/pkts collection
> sample rate (NetFlow only).
>
>
> Regards,
> Simone
>
> > On 21 Jul 2017, at 18:31, Ryan Gelobter <ryan.g@atwgpc.net> wrote:
> >
> > I have the following sample rate configured on a Juniper MX router, I
> understand its not ideal and am working on changing it but what would be
> the proper --sample-rate setting with nProbe for this? I've tried a few
> options and the bandwidth amounts in nProbe still aren't correct.
> >
> > set forwarding-options sampling input rate 100
> > set forwarding-options sampling input run-length 9
> > set forwarding-options sampling input max-packets-per-second 7000
> > set forwarding-options sampling family inet output flow-inactive-timeout
> 15
> > set forwarding-options sampling family inet output flow-active-timeout 60
> >
> > Thanks,
> > Ryan
> >
> >
> > _______________________________________________
> > Ntop-misc mailing list
> > Ntop-misc@listgateway.unipi.it
> > http://listgateway.unipi.it/mailman/listinfo/ntop-misc
>
> _______________________________________________
> Ntop-misc mailing list
> Ntop-misc@listgateway.unipi.it
> http://listgateway.unipi.it/mailman/listinfo/ntop-misc
>