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Brocade FICON Administrator's Guide v7.1.0 (53-1002753-01, March 2013)

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FICON Administrator’s Guide 15
53-1002753-01
Link and FC addressing
1
FICON protocol does not use the ALPA byte. However, the ALPA is a required byte in the FC address.
The channel completes the FC address for a control unit link address by acquiring the ALPA that the
switch returned to the channel when the channel logged in. This is why the ALPA must be the same
for both the channel port and the control unit port. This is also the reason why 10-bit addressing
mode cannot be used for FICON (refer to “Addressing modes” on page 27).