Allied Telesis AT-S25 - Manual (Page 70)

Section II: Local and Telnet Mangement
70
6. Select the desired security level by typing the corresponding letter:
❑ To disable port security on the switch, type A to select Automatic
mode. A switch operating in Automatic mode does not restrict the
number of MAC addresses learned by the ports. The switch
continues to learn addresses so long as there is available space in
the MAC Address Table. This is the default setting.
❑ To specify a maximum number of MAC addresses each port can
learn, type L to select Limited mode. To specify the limits, perform
the procedure in Configuring the Limited Security Mode on
page 71.
❑ To forward frames based solely on static MAC addresses, type S to
select the Secured mode. After activating this security mode, you
must enter the static MAC addresses of the nodes with frames the
switch is to forward. For instructions on how to add static MAC
addresses, refer to Deleting All Dynamic MAC Addresses on
page 159.
❑ To stop the switch from learning new dynamic MAC addresses
and have it forward frames based only on static MAC addresses
and on those dynamic addresses that it has already learned, type
K to select Lock all the ports now.
Note
Only one security level can be active on a switch at a time.
A change to the security level is immediately activated on the
switch.