[j-nsp] Sampling Traffic --- Urgent

[Uttam Shrestha Rana]

Dear Steinar,

Thank your for your kind help.

The topic sampling traffic from juniper is somewhat confusing to me and
exploring myself that may be causing some problem on defining my issue
correctly.

Still some more thing to get help from experts like you and from J-nsp

Actually my scenario is like this:

On my Juniper M10i JUNOS 9.2, the two interfaces where our upstream provier
is connected we have enabled sampling and flow collector is connected on
next interface say C with IP (203.XX.XX.1) version 5, port xxxx.
 Now the question is:
1) Interfaces where upstream providers are connected, input and output
sampling has enabled, is it a best practice or not?
2)In sampling forwarding options, I have configured cflowd destination
(203.XX.XX.2) a collector server IP, with the source IP of interface C. Is
it a best practice if i kept the source IP as the interface C (collector
connected interface 203.xx.xx.1) or not ?  If i don't specify the source IP
address then what can be the result?

Thank You

Regards,
Uttam

On Sat, Dec 19, 2009 at 8:29 PM, <sthaug at nethelp.no> wrote:

> > 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?
>
> When you enable netflow on both of your upstream provider interfaces,
> netflow information for both of those interfaces will be sent to your
> netflow collector. You can differentiate between the interfaces using
> (SNMP) ifIndex, which is part of the netflow information sent to the
> collector.
>
> Steinar Haug, Nethelp consulting, sthaug at nethelp.no
>