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Network Security Principles and Practices by Saadat Malik

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Port Security

Port security is a mechanism available on the Catalyst switches to restrict the MAC addresses that can connect via a particular port of the switch. This feature allows a specific MAC address or a range of MAC addresses to be defined and specified for a particular port. A port set up for port security only allows machines with a MAC address belonging to the range configured on it to connect to the LAN. The port compares the MAC address of any frame arriving on it with the MAC addresses configured in its allowed list. If the address matches, it allows the packet to go through, assuming that all other requirements are met. However, if the MAC address does not belong to the configured list, the port can either simply drop the packet ...

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