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Configuring the Port Security feature is relatively easy. In its simplest form, port security requires going to an already enabled switch port and entering the port-securityInterface Mode command. Here’s an example:
Switch# config t
Switch(config)# int fa0/22
Switch(config-if)# switchport port-security ?
aging Port-security aging commands
mac-address Secure mac address
maximum Max secure addresses
violation Security violation mode
Switch(config-if)# switchport port-security
Switch(config-if)#^Z
By entering the most basic command to configure port security, we accepted the default settings of only allowing one MAC address, determining that MAC address from the first device that communicates on this switch port, and shutting down that switch port if another MAC address attempts to communicate via the port. But you don’t have to accept the defaults.
you can also configure port security on a range of ports. Here’s an example:
Switch)# config t
Switch(config)# int range fastEthernet 0/1 - 12
Switch(config-if)# switchport port-security
However, you need to be very careful with this option if you enter this command on an uplink port that goes to more than one device. As soon as the second device sends a packet, the entire port will shut down.
View the status of port security
Once you’ve configured port security and the Ethernet device on that port has sent traffic, the switch will record the MAC address and secure the port using that address. To find out the status of port security on the switch.
Switch# show port-security address
Disabling Port Security in Cisco Switch
Now we will see an example how to disable port security in cisco security.We have configured fa0/22 for port security now if you want to disable port security follow these steps
Switch# config t
Switch(config)# int fa0/22
Switch(config-if)# no switchport port-security
Switch(config-if)# end
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