What is Cisco Port Security?

In Cisco Switches, it is configured to prevent Port Security layer 2 attacks, and unauthorized persons prevent from accessing the network.

What is Cisco Port Security?

What is Port Security?

With port security, you can maximize security on a network with multiple computers. Under normal circumstances, any computer connected to a switch port can easily access the network environment. This is often not recommended. It is therefore recommended that you enable this feature on manageable switches.

Because the OSI model controls traffic flow in layer 2, you can make MAC address-based restrictions.

By restricting each port on the Cisco Switch and activating it for only one computer, we can disable the port when another computer is connected to that port, thus ensuring that the network environment remains secure.

The main roles of preventing unauthorized access to a network environment are to close the idle ports on the Switch and enable the Port Security feature on the active ports.

For example, it is difficult to maintain security at a high level on a large network. You should evaluate each step and take steps accordingly. An unauthorized user who is physically trying to access from the outside must not be able to connect his or her computer to a Switch on the network.

How to Enable Port Security

You can use the switchport port-security command to enable Port Security on the Switch. After using this command, you must also set the action on the port in case of violation.

Switch# config terminal
Switch(config)# interface FastEthernet 0/1
Switch(config-if)# switchport port-security
Switch(config-if)# switchport port-security maximum 1
Switch(config-if)# switchport port-security mac-address sticky
Switch(config-if)# switchport port-security violation shutdown

The above commands are; Explains that Port Security enabled on FastEthernet0/1 and that only one MAC address can access via this interface, and the Sticky command will take into account the MAC address of the connected computer.

As a result, when an unauthorized person or another computer on the network connects to this port, the violation will occur, and the port will be closed, and notify you.

Enabling Port Security in Switch ⇒ Video

You can watch the video below to enable security settings for Switch’s ports and also subscribe to our YouTube channel to support us!

   Final Word


In this article, we have discussed what the Cisco Port security is and how it is applied. If you want to configure this security more advanced, you can create and test a project on Packet Tracer or GNS3. Thanks for following us!

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