[c-nsp] Cache Flow

[Julio Arruda]

Keith wrote:
> How much cpu load does enabling ip route-cache flow on an interface put on
> a router?
> 
> Have a 7206vxr with 256M of ram. Runs BGP, but we only take a default
> route from that particular upstream, not full or partial tables.
> 
> Router peaks out about 300Meg of traffic total in/out with the cpu topping
> out around 45-50%.
> 
> I don't want to export the flows, but at least get an idea of the flows
> on the router using sho ip cache flow.
> 
> Software running on this router is (C7200-IS-M), Version 12.3(15).


http://www.cisco.com/en/US/technologies/tk543/tk812/technologies_white_paper0900aecd802a0eb9_ps6601_Products_White_Paper.html

Should give you some reference on this, for just enabling flow, not 
exporting, NF-enable should be the 'keyword'.