Port security is not enabled.
Interface configuration mode
Port mode change is not allowed when port security is enabled on the interface.
The no switchport port-security command disables port security on the interface.
The following example enables port MAC security on an interface:
device(config)# interface Ethernet 3/2 device(conf-if-eth-3/2)# switchport device(conf-if-eth-3/2)# switchport port-security