HI,

I just started CCNA. I configured port security on a cisco 2950 switch and it is not working. I need to allow only 2 pcs to connect only to the specific port. those are my personal laptops. what i need is, if any body tries to connect some other laptop to my switch port it should be shutdown. Any Ideas?

OK. actually this is a very simple configuration. anyway I'll guide you through the configurations.

Open your switch command line and follow the configurations given below.

Switch>enable
Switch#configure terminal

Go in to the interface which you want to apply security.

Switch(config)#interface FastEthernet 0/1

Configure the port as an access port. It tells that this port is going to connect to a End device.

Switch(config-if)#switchport mode accesss

Then we need to enable port security

Switch(config-if)#switchport port-security

Then you need to configure the maximum number of devices to be allowed. your requirement is 2 devices.

Switch(config-if)#switchport port-security maximum 2

after that you can provide the mac address of each device

Switch(config-if)#switchport port-security mac-address 5aa9.0320.02ab
Switch(config-if)#switchport port-security mac-address 4ab3.0020.02ba

ultimately you want to shut down the interface if there is any security violation. lets do it...

Switch(config-if)#switchport port-security violation shutdown

Done..