Reference Guide

NOTE
FA-PWWN is supported with F_Port trunking on the supported Access Gateway platforms.
Access Gateway N_Port failover with FA-PWWN
If an Access Gateway is connected to multiple switches, you should configure the same FA-PWWNs on both switches to avoid having to
reboot the host in case of failover.
If the same FA-PWWNs are not configured on the switches, and if an FA-PWWN F_Port on an Access Gateway fails over to an N_Port
that is connected to a different switch, the FA-PWWN assigned to the Access Gateway F_Port following the failover will be different than
it was before the failover occurred. This situation may require the host to reboot to bring it back online. Even after the reboot, the host
may potentially go into a different zone because the FA-PWWN is different.
Fabric-Assigned PWWN
Brocade Fabric OS Administration Guide, 8.0.1
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