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9-21

Configuring and Monitoring Port Security

MAC Lockdown

Deploying MAC Lockdown

When you deploy MAC Lockdown you need to consider how you use it within

your network topology to ensure security. In some cases where you are using

techniques such as Spanning Tree Protocol (STP) to speed up network

performance by providing multiple paths for devices, using MAC Lockdown

either will not work or else it defeats the purpose of having multiple data paths.

The purpose of using MAC Lockdown is to prevent a malicious user from

“hijacking” an approved MAC address so they can steal data traffic being sent

to that address.

As we have seen, MAC Lockdown can help prevent this type of hijacking by

making sure that all traffic to a specific MAC address goes only to the proper

port on a switch which is supposed to be connected to the real device bearing

that MAC address.

However, you can run into trouble if you incorrectly try to deploy MAC

Lockdown in a network that uses multiple path technology, like Spanning

Tree.

Let’s examine a good use of MAC Lockdown within a network to ensure

security first.

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