I am having a strange problem with a 3Com 4900 switch and three 4250 switches.
My configuration looks like this
[4900] | | | | | |--[4250] | | | |----[4250] | |------[4250]The problem is that on a regular basis, random PC's attached to the
4250 switches are unable to ping one or more servers attached to the 4900 switch. Repatching the workstation to a different 4250 resolves the problem. I was seeing this problem about a year ago and thought it was resolved. All of the 4250 switches are new whereas the 4900 was involved in the previous problems. It seems that the 4900 incorrectly learns the workstation MAC...Has anyone else run into anything like this or can suggest what might be causing it?
Cheers.
Robin