Determining counts or size of routing table? (netstat performance?)

Julian Elischer julian at
Sat Nov 29 20:32:36 PST 2008

Mykel wrote:
> Got a few 6.x machines running OpenBGPd with a few BGP full-feeds and a
> handful of peers... I'd like to determine the size of the FIB/kernel
> routing table. OpenBGPd does not give me this data, and on my
> duallie-Xeon 2.8s, it takes quite a while to use netstat & wc to count.
> I'm not looking for exact numbers, just something I can poll via NetSNMP
> and plot in cacti...
> I looked though netstat, route, sysctl, vmstat, even pored over an
> snmpwalk... can't find anything.
> Been asking around, and the only suggestion I've received was to write a
> daemon that dumps the table and then monitors the changes, but I'm not a
> programmer, nor could I find any tool in ports that might assist in this.
> I'd be happy with almost any metric that gives me some absolute
> reference as to how big my routing table is so I can get some nice
> pretty graphs done up. Not pounding the system every 60-300 seconds
> would be very nice.
> Any suggestions? Or does everyone just pipe netstat? Is there a MIB for
> sysctl or NetSNMP I'm missing?

no. It's a hard thing to do so that is why it hasn't been done yet.

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