HP AE370A - Brocade 4Gb SAN Switch 4/12, Administrator'S Manual

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Fabric OS 5.2.x administrator guide 391
Converting port number to area ID
Except for the following cases, the area ID is equal to the port number:
• when you perform a port swap operation
• when you enable Extended Edge (also known as “displaced PID”) PID on the Director
If you are using Extended Edge PID format (for example, the 4/256 SAN Director with configuration option
5) and would like to map the output of the port number to the area ID, use the following formula (for ports
0-127):
where:
a area
p port number
% modulus (or remainder)
a = (p + 16) % 128
0 p 128
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