Port security

Port security is used to secure the port of a layer 3 switch for the purpose of to not access that port except the dedicated mac address computer, or when some violate that restriction the switch port must be off.

• Switch# conf terminal
• Switch(conf)#  int fa 0/1
• Switch(conf_if)# switchport mode access
• Switch(conf_if)# switchport port security
• Switch(conf_if)# switchport port-security mac-address 00d0.b74f.8218

We can used sticky in place of giving MAC address as

• Switch(config_if)# switchport port-security mac-address sticky
• Switch(conf_if)# switchport port-security violation shutdown
• Switch(conf_if)# exit
• Switch(conf)#exit
• When some one violate that restriction then the switch port off to on this port back, as
• Switch(conf)# int fa 0/1        (that port no)
• Switch(conf_if)# shutdown
• Switch(conf_if)# no shutdown
• Switch(conf_if)# exit
• Switch(conf)# exit