[j-nsp] Sampling Traffic --- Urgent

[Uttam Shrestha Rana]

Hello Steinar Haug,

Thank You .

I have enabled sampling on one interface facing to upstream and got the
result as needed (Cflowd) . But now i want to enable sampling on both the
interfaces facing to upstream provide. On the server will it give sampling
result on addative of both the interfaces or separately of particular
interface. I am looking for sampling separately  of interface on my server,
is it possible to be done?

Regards,
Uttam

On Fri, Dec 18, 2009 at 8:06 PM, <sthaug at nethelp.no> wrote:

> > We have tow upstream provider say upstream A and B connected to my end on
> > Juniper M10i with JUNOS:9.2. We need to enable sampling or say need to
> get
> > the flow of traffic or collect the data connected to our upstream
> provider
> > Upstream A and B. Doing on practice we have cflowd configured to get the
> > traffic sampled, if we enable cflowd for all the interface (Connected to
> > Upstream A and B) to get sampled traffice will it be giving the exact
> > sampling.If we enabled sampling both interface input and output, how
> > sampling sends to the distination server. Please provide us the best
> > practice to enable sampling to get the exact sampling of the traffic on
> our
> > network as we have many customers connected behind the router interfaces.
>
> I am not really sure I understand your question. However, I believe
> normal practice is to enable sampled netflow on input and output for
> the interfaces towards your transit providers, and also for instance
> any peering interfaces (towards IXes, private peerings etc). You would
> not normally enable netflow on customer interfaces.
>
> I am unclear on what you mean by "exact sampling". By definition, you
> are throwing away some information when you are doing sampled netflow.
>
> Steinar Haug, Nethelp consulting, sthaug at nethelp.no
>