Hi, I have a problem with one of the switch stacks at my work. I have 2 3850s in a stack acting as a core switch for an industrial controls network. A few months ago a vendor was doing upgrades to some of the switches and he uploaded a new version of IOS to it and set it to install on the next reboot. It was never rebooted to complete the process.
Apparently one of the switches rebooted by it's self and did the install, and it wont rejoin the stack because they don't have the same IOS version. The stack is now just running on the one switch that is still running the old version that it failed over to when the reboot happened.
So what can i do to get them to the same version so they are in a stack again? Do i just need to reboot the bottom switch to kick off the update? To avoid much downtime can i remove the stacking cables and reboot the updated one to handle the network traffic while the other one does its update then stack them when they both on the same version?
The vendor who designed this network to use a centralized vmware setup and single pair of stacked switches in the IDFs should be shot. It is next to impossible to do any maintenance on this network because of its poor design. And they didn't build anyway into it to get a maintenance window on it or hire any engineers on staff capable of managing it. I guess that is why all the process controls engineers they had have quit, and i'm stuck dealing with this nightmare of a system in addition to all the regular IT stuff i was hired to do.
Thanks
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