I am not sure what is the problem, because cables are OK. The same config (physical layout, cables and config.file) worked just fine, and it works even today. Only thing I did diferently is that I turned on 3550 (being disconnected from the 2950s) and then plug each 2950 one by one, cable by cable and it seems to be working fine.
Last time it stoped working was after I powered off and on entire rack of switches. It seemed to behave differently if you power it on while the switches are connected.
Well, I am not sure what the cause is. However, it is working now. Thanks for the suggestions.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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