Allied Telesis AT-S63 - Manual (Page 208)

Chapter 16: Denial of Service Defense
208 Section II: Advanced Operations
8. Configure the following parameters as necessary:
Status
Click Enable or Disable to enable or disable DoS on the selected ports.
Mirror Port
This option applies to the Land, Tear Drop, Ping of Death, and IP
Options. Enabling this option mirrors the traffic examined by a defense
mechanism to another port on the switch. To use this feature, you must
activate port mirroring on the switch and specify a destination mirror
port, as explained in “Creating a Port Mirror” on page 114.
9. Click Apply.
The defense is immediately activated on the ports.
10. To permanently save your changes, select the Save Config option in
the Configuration menu.