How to configure the port security to limit the number of connected devices

This example shows administrators how to configure port security to limit the number of connected devices.
In a real environment, port security controls the number of users connecting to a server.

Configure the port security to limit the number of connected devices

1. Configure Switch-1

2. Test the result

3. What could go wrong

1. Configure Switch-1

Enter web GUI and go to Menu > Advanced Application > Port Security. Check port 3 and set the “Limited Number of Learned MAC Address” to 2.

If you set the Learned MAC addresses to 0 and add a MAC to the Static MAC Table, only this single device is allowed to connect to the configured port.

2. Test the result

• PC-1 can ping Server

• Connect PC-2 to port
• PC-2 cannot ping server

• Access web GUI of Switch-1. Go to Menu > Management > MAC Table > Search. The MAC Address Table should show the MAC address of PC-1 (and Switch-2), but not the MAC address of PC-2.

3. What could go wrong

The MAC address of Switch-2 will also be learned in Switch-1 MAC address table. Therefore, remember to consider Switch-2’s MAC address when setting the number of Limited Number of Learned MAC Address.

KB-00316