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ES-2000 Series Switch Support Notes
All contents copyright (c) 2006 ZyXEL Communications Corporation.
60
Switching security
MAC freeze
As an added protection against network intrusion attacks, ZyXEL has
implemented the MAC Freeze feature on all ZyXEL Management Switches
with firmware version 3.6 or above. Security has been the focus of our
Ethernet switch design.
With the MAC freeze feature enabled, dynamic MAC addresses on specified
ports are stored in the static MAC address table. At the same time, MAC
address learning is disabled on these ports thus denying network access for
computers within unknown MAC addresses.
Without the MAC freeze function, any computer can access the network
through a switch port. The port automatically learns the computer’s MAC
address and stores that to the MAC address table.
Activate the MAC freeze function on a port by entering the port-security [port
number] MAC-freeze
command in the CLI.
The following figure shows an example where the MAC freeze feature is
enabled on port 6. The switch automatically copies all dynamically learnt MAC
address on port 6 to the static MAC address.
Figure 1: Enable MAC Freeze Example