When the MAC address exists on two different connected VLANs, and creates a loop, why oh why is the default action to close the entire port group?

A failover test just took down all the services in the DMZ, ticket system, exchange, dynamics, citrix..

No more failover testing until Tuesday!

@Idrake This is why I had a big sign in my server room: IF IT'S FRIDAY, DON'T TOUCH ANYTHING

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@AskNick thing is, we had been doing failover testing paat few days, never had a incident like that. It is impressive how duplicating a MAC took down the FTD.

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