> # Port Swapping Guidelines

> Be sure to follow these guidelines when using the FICON port swapping feature:

> - Port swapping is not supported for logical ports (PortChannels, FCIP links). Neither the old-port-number nor the new-port-number can be a logical port.
> - Port swapping is not supported between physical ports that are part of a PortChannel. Neither the old-port-number nor the new-port-number can be a physical port that is part of a PortChannel.
> - Before performing a port swap, the Cisco NX-OS software performs a compatibility check. If the two ports have incompatible configurations, the port swap is rejected with an appropriate reason code. For example, if a port with BB_credits as 25 is being swapped with an OSM port for which a maximum of 12 BB_credits is allowed (not a configurable parameter), the port swapping operation is rejected.
> - Before performing a port swap, the Cisco NX-OS software performs a compatibility check to verify the extended BB_credits configuration.
> - If ports have default values (for some incompatible parameters), then a port swap operation is allowed and the ports retain their default values.
> - Port tracking information is not included in port swapping. This information must be configured separately (refer to the Cisco MDS 9000 Family NX-OS Quality of Service Configuration Guide).

> Note The 32-port module guidelines also apply for port swapping configurations (Refer to the Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide).

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