Cisco Catalyst 3550

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Catalyst 3550 Multilayer Switch Command Reference
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Chapter 2 Catalyst 3550 Switch Cisco IOS Commands
mac address-table aging-time
mac address-table aging-time
Use the mac address-table aging-time global configuration command to set the length of time that a
dynamic entry remains in the MAC address table after the entry is used or updated. Use the no form of
this command to return to the default setting. The aging time applies to all VLANs or a specified VLAN.
mac address-table aging-time {0 | 10-1000000} [vlan vlan-id]
no mac address-table aging-time {0 | 10-1000000} [vlan vlan-id]
Note Beginning with Cisco IOS Release 12.1(11)EA1, the mac address-table aging-time command replaces
the mac-address-table aging-time command (with the hyphen).
Syntax Description
Defaults The default is 300 seconds.
Command Modes Global configuration
Command History
Usage Guidelines If hosts do not send continuously, increase the aging time to record the dynamic entries for a longer time.
Increasing the time can reduce the possibility of flooding when the hosts send again.
Examples This example shows how to set the aging time to 200 seconds for all VLANs:
Switch(config)# mac address-table aging-time 200
You can verify your setting by entering the show mac address-table aging-time privileged EXEC
command.
Related Commands
0 Aging is disabled. Static address entries are never aged or removed from the table.
10-100000 Aging time in seconds. The range is 10 to 1000000 seconds.
vlan vlan-id (Optional) Specify the VLAN ID to which to apply the aging time. The range is 1
to 4094.
Release Modification
12.1(4)EA1 This command was introduced.
12.1(11)EA1 The mac-address-table aging-time command was replaced by the mac
address-table aging-time command.
Command Description
show mac address-table aging-time Displays the MAC address table aging time for all VLANs
or the specified VLAN.