Hi, The connection between Cisco and Brocade should works as NPV/NPIV. But your design will not work, you cannot connect one NPV switch in another NPV switch. For you desing works, you need invert the switch roles. Uses N5K as NPIV and Brocade as NPV...

Hello    Before call to TAC,    What is your UCS version? Did you check compatibility matrix?  https://ucshcltool.cloudapps.cisco.com/public/   Googling i found this bug on past version of ESXi. Maybe this bug has come back.   https://bst.cloudapps....

Hello Udo,    Maybe a bug? Not are same conditions, but same error in same ACI version you are running.   https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvi72804/   Good luck and Regards, 

 Hello Vincent,    Without any log, is difficult see why this happened.     You could do this test again?  Relocate a blade from another slot to slot 5 and perform the test again.    IF the fail move together with the blade, Investigate this blade.  ...