> # Port Prohibiting

> To prevent implemented ports from talking to each other, configure prohibits between two or more ports. If you prohibit ports, the specified ports are prevented from communicating with each other.

> Tip You cannot prohibit a PortChannel or FCIP interface.

> Unimplemented ports are always prohibited. In addition, prohibit configurations are always symmetrically applied—if you prohibit port 0 from talking to port 15, port 15 is automatically prohibited from talking to port 0.

> Note If an interface is already configured in E or TE mode and you try to prohibit that port, your prohibit configuration is rejected. Similarly, if a port is not up and you prohibit that port, the port is not allowed to come up in E mode or in TE mode.

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