I have a m6348 two member stack in a M1000e fabric B. Has been working fine for years. Today I can no longer ping or telnet to the master. The switches are still forwarding traffic. When I look at them via the CMC they all have green check marks. However B2 is listed as the master when it used to be B1. This would indicate that a failover event occurred but there is nothing in the logs to indicate this. And I can't ping B1, B2. I can get to the switches via ssh through the cmc and everything looks fine.
I also have a two member stack in fabric A, no issues there, can access the master via telnet etc.
Anybody seen this. Dell support says to reboot the switches.