did you do netflow switching or cef + netflow accounting that time? -- Tomas Daniska systems engineer Tronet Computer Networks Plynarenska 5, 829 75 Bratislava, Slovakia tel: +421 2 58224111, fax: +421 2 58224199 A transistor protected by a fast-acting fuse will protect the fuse by blowing first.

-----Original Message----- From: Ralph Doncaster [mailto:ralph@istop.com] Sent: 22. mája 2002 16:15 To: Heath_Dieckert@Dell.com Cc: nanog@merit.edu Subject: RE: Cisco 7200 VXR with NPE-400 (was RE: The market must be coming back)

...

Based on our testing it looks like it all has to do with packet size. With small packets the throughput is very low. With what Cisco calls an "internet mix" of packet sizes throughput is much better. When doing max MTU packets, the throughput is of course the best.

The other thing I've found about traffic type is how sensitive netflow is. I was running it for a while, then I got a co-lo customer that had a lot of UDP traffic with small packet sizes and rarely more than a few packets between the same src/dest ip/port (much like DNS queries). It was enough to flatline the box and cause it to crash.

-Ralph