[j-nsp] Flow accounting on an M7i

[Doan Nguyen]

Starting JUNOS XXXX a requirement for cflowd to work is to configure NTP as Stefan pointed out a few emails earlier.

--- On Wed, 8/18/10, sthaug at nethelp.no <sthaug at nethelp.no> wrote:

From: sthaug at nethelp.no <sthaug at nethelp.no>
Subject: Re: [j-nsp] Flow accounting on an M7i
To: andy at ctdam.com
Cc: juniper-nsp at puck.nether.net
Date: Wednesday, August 18, 2010, 2:39 PM

> I'm trying to enable flow accounting on one of our M7is.  JunOS  
> version is 9.1R8.  No matter what I do, I can't get a flow to export.   
> I'd appreciate any input to obvious errors, or tips on other things to  
> try.  I've also tried removing sampling from the interface and doing  
> it with a firewall rule.

Have you tried RE-based sampling? We use

input {
    family inet {
        rate 1000;
        run-length 0;
        max-packets-per-second 1000;
    }
}
output {
    cflowd a.b.c.d {
        port 2055;
        version 5;
        no-local-dump;
        autonomous-system-type origin;
    }
}

and then for the relevant interfaces we have a firewall filter which
includes the "sample" keyword.

Steinar Haug, Nethelp consulting, sthaug at nethelp.no
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