Has anyone ever had this happen? I upgraded a stack of WS-C2960S-48FPS-L from 12.2(55)SE5 to 15.0(2)SE12 (Cisco's recommended version) and it broke the stack. Both stacking ports on bothe switches showed Down/Down. I swapped out the cables and reseated the stacking modules and they still wouldn't stack. I reverted to the old IOS and they immediately stacked with each other again. It's as if the new IOS broke the ability to stack. I would like to have this stack on a newer IOS but I can't justify losing the ability to stack.
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