Monitoring traffic and collisions

Hello-
I am wondering if I could get some feedback on a utility that can be used to monitor collisions (source of problem) on the switches in my cluster. Current setup: 8 x 3548's -> 1 x 3550 in a star config. There seems to be alot of latency at times. I have MRTG running against the 3550, but I need to get to the root of the problem. Any help would be appreciated. Thx in advance.

That is a strange graph from MRTG. Are you sure that MRTG is still updating? The only time I have seen MRTG draw a graph like that is when it stops updating. The reason for this is when MRTG can no longer collect data it just keeps using the last successful measurement and you end up with a never changing graph like you have.
Ports blinking amber usually indicate errors. If you do a show interface command every couple of minutes do you see the error cuonters incrementing? If not then you might have failing hardware or heavy traffic in a half duplex environment. If you set the port speeds and duplex you must match the settings on all attached hosts. Hosts that are not set will match speed but end up at half duplex resulting in collisions.
The MRTG/MIB stuff from the URL I supplied sometimes works - sometimes not. If it doesn't work it is the MIB portion that is ususally incorrect.
-Mark

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