> # About the Reserved FICON Port Numbering Scheme

> A range of 250 port numbers are available for you to assign to all the ports on a switch. Table 25-3 shows that you can have more than 250 physical ports on a switch and the excess ports do not have port numbers in the default numbering scheme. When you have more than 250 physical ports on your switch, you can have ports without a port number assigned if they are not in a FICON VSAN, or you can assign duplicate port numbers if they are not used in the same FICON VSAN. For example, you can configure port number 1 on interface fc1/1 in FICON VSAN 10 and fc10/1 in FICON VSAN 20.

> Note A VSAN can have a maximum of 250 port numbers.

> Note FICON port numbers are not changed for ports that are active. You must first disable the interfaces using the shutdown command.

> Note You can configure port numbers even when no module is installed in the slot.

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