How to protect Switch ports?

To protect ports of a Cisco switch you need to set the following:

The ports must be on Access mode, note that after the # is a comment to light things up a little ^_^

S(config)#intf0/x      # Where "x" is the port number

you can also do it on a range

S(config)#int range f0/x - y      # Where "x" is the first port and "y" is the last port

S(config)#switchport port-security

S(config)#switchport port-security maximum x     # Where "x" the number of allowed addresses between1 -132

You can use one of those:

• S(config)#switchport port-security mac-address sticky          # If you want to set the MAC-address dynamically
•  S(config)#switchpor tport-security mac-address XXXX.XXXX.XXXX          # If you want to set the MAC-address manually

Then use one of these three

•  S(config)#switchport port-security violation shutdown        # This will shutdown the port if there is a violation
•  S(config)#switchport port-security violation protect             # This will disable the port if there is a violation
•  S(config)#switchport port-security violation restrict             # This will restrict the port from been used if there is a violation