This should help: http://www.cisco.com/en/US/tech/tk812/technologies_white_paper0900aecd802a0e b9.shtml
On 11/23/07 4:07 AM, "Gert Doering" <[EMAIL PROTECTED]> wrote: > Hi, > > On Fri, Nov 23, 2007 at 11:14:16AM +0300, Rivo Tahina RAZAFINDRATSIFA wrote: >> Thanks to all who answered to this question, we are now testing some >> of these, I would like to know the additional cpu charge due to the >> use of netflow on the cisco box. > > This very much depends on the traffic characteristic (high number of > short-lived flows vs. long-lived high-volume flows, etc.) and the type of > box you have (software-forwarding vs. MLS based, vs. PXF vs. ...). > > On 7600s, the actual flow collection is done in the hardware ASICs, and > doesn't cause any load - but the actual flow *export* can cause notable > load (>30%) if there is a high number of flows on the box, like "2 Gbit/s > of short-lived HTTP flows" or "single-flow DNS queries" or such. > > On software-forwarding platforms, like the 7200, my gut feeling is "add 10% > CPU load for netflow". But that *will* vary according to traffic mix. > > gert -- Adam Powers Chief Technology Officer Lancope, Inc. c. 678.725.1028 f. 678.302.8744 e. [EMAIL PROTECTED] _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
