This feels like a dumb question, but here goes.
I have a Cisco Catalyst 2960S switch that is currently running software version 12.2(55)SE3
The most current software listed on Cisco's website is 12.2.58-SE2(ED) and 15.0.1-SE2(ED)
Do I need to remain on the 12.x series of software, or can I use the 15.x software?
Best Answer
Stick with 12.2(55)!
IOS 12.2(58) and higher have major memory leak issues that can lock you out of the switch (console included) and should be used with caution. Details. This bit me in the you know what pretty hard. Although to answer your question - technically yes you could upgrade to 15 if you wanted to.