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5.6 MAC Address Table
The MAC Address Table is a table of node addresses that the switch automatically builds by “learning.” It performs
this task by monitoring the packets that pass through the switch, checking the source and destination addresses, and
then recording the source address information in the table. To see the table, type the following command in privileged
mode:
Switch# show mac-address-table
Vlan Mac Address Type Ports
---- ----------------- ---- -----
3 00:00:1C:01:00:09 Dynamic eth13
1 00:00:94:00:00:10 Dynamic eth9
1 00:00:94:A0:B6:7B Dynamic eth9
1 00:00:94:AA:64:37 Dynamic eth9
1 00:00:94:D2:53:79 Dynamic eth9
-- 00:00:94:D2:56:EA Self --
1 00:0A:27:AE:50:66 Dynamic eth9
1 00:50:FC:94:00:0D Dynamic eth9
The switch uses the information in this table to decide whether a frame should be forwarded to a particular
destination port or “flooded” to all ports other than to the received port. Each entry consists of three parts: the MAC
address of the device, the port number on which it was received, and the VLAN number. The MAC address of the
switch is identified as “self”.
By default, entries in the switch's MAC address table expire after 300 seconds. To change this value, use the
following command in global configuration mode:
Switch(config)# mac-address-table aging-time
The range is 10–1,000,000 seconds. A value of 0 disables aging.
53 Asante IntraCore IC36240 User’s Manual