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Cisco Bug: CSCvu73734 - FLOGI implicit logout needs to transmit F Port Server LOGO to device being logged out

Last Modified

Jul 27, 2020

Products (1)

  • Cisco MDS 9000 Series Multilayer Switches

Known Affected Releases

8.1(1)

Description (partial)

Symptom:
An FC array in migration mode has a "proxy like" function. When it's interface came up it sent several FDISCs into the switch with PWWNs of other real devices that were currently logged in
on other interfaces. When that occurs, the switch implicitly logs the original real device out of the switch and fabric, and then rejects the new FDISC(or FLOGI) to give time for the 
implicit LOGO to complete. The new device, reissues the FDISC(or FLOGI) and then it is successful. 

During this implicit LOGO the original device is not sent a LOGO from the F Port Server to notify that it is now logged out. The end device continues
to attempt to transmit but the frames are all discarded since the interface where the device is has been completely deprogrammed. THis results in a total loss of communication
between the original device and all of devices it is zoned with.

Conditions:
Occurs when a FLOGI/FDISC is sent in to the switch for a PWWN that is already logged into the same switch in the same VSAN.
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