I got stack of 3 WS-C3850-12X48U, and I set priority for them but when the master failed I loose whole stack. I mean the standby doesn't come be master!!! and the configuration not sync between these switches I don't why. So please advice me for that and I'm using the version of code universalk9.16.03.07.
my suggestion maybe the configuration isn't synced between the SW.
What made you conclude the config wasn't synchronized with the secondary?
Is it because when the primary failed the remainder of the stack was unreachable? If this is the case, the first question everyone is going to ask is: Where is uplink port? Is the uplink port connected to the stack master? Is there an uplink port connected to the secondary port?