How to obtain serial number in Brocade Switch.

Use chassisshow command to display the Field Replaceable Unit (FRU) information for each object in the chassis, and the Chassis backplane revision along with serial number.
Usage:-
chassisShow
Example:-
switch10:admin> chassisShow
CHASSIS/WWN Unit: 1 (in same assembly as WWN Unit: 2)
Header Version: 2
Power Consume Factor: -3
Factory Part Num: 60-0311101-02
Factory Serial Num: QV060011192
Manufacture: Day: 28 Month: 12 Year: 2007
Update: Day: 4 Month: 7 Year: 2010
Time Alive: 838 daysTime Awake: 36 days
ID: BRD0000CA
Part Num: SLKWRM000048K
Serial Num: USB80470AF

note: Factory Serial Num: QV060011192 is Brocade serial number and Serial Num: USB80470AF is supplier serial number.