[nsp] Limiting Netflow

[Bradley Dunn]

On Thu, 10 Oct 2002, Hank Nussbacher wrote:

> No one sent this to me but I just found it so it may be of interest:
> 
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/12cgcr/switch_r/x
> swcmd.htm#xtocid6
> 
> I just tried it:
> 
> TAU-gp1(config)#ip flow-cache entries 30000

I'm not sure if that will do what you want. I think by setting the number of 
entries below the default of 64K you might actually increase the volume of 
NetFlow export traffic. Flows will be aged more aggressively to keep the number 
of entries in the cache down to 30K. You could try increasing the size of the 
flow-cache which might reduce the volume of NetFlow traffic at the expense of 
more memory utilization on the router.

AFAIK only the GSR supports sampling. Depending on your application router-based 
aggregation (version 8) might help.

Bradley