Hi all,
I had a very disappointed experience today during the planned upgrade on my 2960 to IOS version 12.2(58)SE2 after business hours. We have a small office with 3x 2960 and a couple of 2950. There is a single 2960 called as the "central" as its the STP root, and most other switches are directly connected to the central. The remaining switches are conected to one of the switches conneting to the central.
I tested the aforementioned IOS on 2x 2960 las t week, but did not upgrade the central one. The 2x switches ran fine for a week, so I decided to upgrade the central one: basically it was a disaster. After the restart, the central became immediately unavailable via SSH (though admin IP pingable). I connected to the console, and realized that even console does not work, as I received the error message: "Low memory", and the console session could not be started. I restarted the switch once again (had to cut the power) and this time I managed to connect via the serial: the free memory was approx 2 MB, though its was over 5 MB if running 12.2(55)SE1. After 1-2 mins, free memory decreased down to 1.8 megs. SSH was still not functioning. At this time, fearing of a sudden memory leak during the night, I had to rollback to the previous version.
My config is quite simple: RSTP root, DHCP snooping, 1 LACP etherchannel, only 5x VLANs with VTP server, MOTD and BANNER (yeah I know its a risky feature since the previous IOS) I wonder what can be the problem here?
I have attached the running config of the central 2960 (removed some sensitive entries)
