Command rejected: Not eligible for secure port

If you have this error message “Command rejected: Not eligible for secure port.” it means that you first must set the port to the access mode.

SW4(config)#int f0/4
SW4(config-if)#switchport port-security
Command rejected: Not eligible for secure port.
SW4(config-if)#switchport mode access
SW4(config-if)#switchport port-security

and that’s it.

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