Upgrade IOS on one unit at a time 9500 stackwise mode!
Is this possible to be done without an outage?
A pair of cisco 9500 in stackwise virtual mode needs IOS upgrade. I cant afford an outage and I wonder what would be the best way to do it. Initially i thought, I can put the new code in standby bootflash and do a redundancy reload the peer and then do a force switchover for the active unit reload!
The standby boots up with new code after peer reload but wont join the stack because of version mismatch so i cannot do a manual switchover to reboot the active.
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