A domain ID is a unique number that
is provided to each switch in the fabric. The area ID is used to identify a group of
switch ports that are used for connecting nodes.
"A domain ID is a unique number provided to each switch in the fabric. Although this is an 8-bit field, there are only 239 available addresses for domain ID because some addresses are deemed special and reserved for fabric management services. For example, FFFFFC is reserved for the name server, and FFFFFE is reserved for the fabric login service. <<The area ID is used to identify a group of switch ports >> used for connecting nodes. An example of a group of ports with a common area ID is a port card on the switch. The last field, the port ID, identifies the port within the group."
Information Storage and Management . Wiley. Kindle Edition.
The area ID is used to identify a group of F_ports. An example of a group of
F_ports would be a card on the switch with more than one port on it
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