Switching - Configuring a Catalyst Switch

Port Security

You can use the port security feature of Cisco switches to restrict limited MAC addresses to be able to use a port. This is useful for security purposes. To configure port security use the ?switchport port-security? interface command where you can enter a specific MAC address or set it to learn the first MAC address and only allow access from that MAC.

Switch Port Modes

	Trunk	Access	Dynamic Desirable	Dynamic Auto
Trunk	Trunk	N/A	Trunk	Trunk
Access	N/A	Access	Access	Auto
Dynamic Desirable	Trunk	Access	Trunk	Trunk
Dynamic Auto	Trunk	Access	Trunk	Auto

note: Full Duplex = No Collisions, used when Point to Point e.g Switch to Switch or Switch to Router.