Allied Telesis AT-S63 - Manual (Page 131)

AT-S63 Management Software Menus Interface User’s Guide
Section I: Basic Features 131
learns by examining the source MAC addresses of the frames received
on the ports.
Dynamic MAC addresses are not stored indefinitely in the MAC address
table. The switch deletes a dynamic MAC address from the table if it does
not receive any frames from the node after a specified period of time.
The switch assumes that the node with that MAC address is no longer
active and that its MAC address can be purged from the table. This
prevents the MAC address table from becoming filled with addresses of
nodes that are no longer active.
The period of time that the switch waits before purging an inactive
dynamic MAC address is called the aging time. This value is adjustable on
the AT-9400 Series switch. The default value is 300 seconds (5 minutes).
For instructions on changing the aging timer, refer to ”Changing the
Aging Time” on page 140.
The MAC address table can also store static MAC addresses. A static MAC
address is a MAC address of an end node that you assign to a switch port
manually. A static MAC address, after being entered in the table, remains
in the table indefinitely and is never deleted, even when the end node is
inactive.
You might need to enter static MAC addresses of end nodes the switch
does not learn in its normal dynamic learning process, or if you want a
MAC address to remain permanently in the table, even when the end
node is inactive.