[nsp] Netflow Questions on a 2621

Clinton Work work at scripty.com
Fri Mar 14 15:58:33 EST 2003

I have often used Netflow on 2600s during troubleshooting to find/block
DOS attacks and large traffic flows. I see no problem with enabling netflow
export with your traffic levels and CPU load.

Netflow has been supported since 12.0 mainline. I have used it on 12.0(10) 
IP / IP PLUS and later.

On Fri, Mar 14, 2003 at 03:35:35PM -0500, Burton Windle wrote:
> We have a 2621 router which averages 60 kilobytes/sec during the day out a
> FastEth interface. Its running 12.1(5)T10 with 64mb RAM.  The CPU usage
> right now is next to nothing (CPU utilization for five seconds: 5%/4%; one
> minute: 5%; five minutes: 5%)
> We wish to enable NetFlow stats on this router, to monitor what protocols
> are being passed/using the most bandwidth (we already use MRTG).
> A) Does this version of IOS/hardware support netflow?
> B) Would a 2621 be fast enough to enable NetFlow without adding noticeable
>    latency to routing?

Clinton Work                                        clinton at scripty.com
Calgary, Alberta

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