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.

port security-network

  • 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

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