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560 | Layer 2
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Clear the MAC Address Table
You may clear the MAC address table of dynamic entries:
Set the Aging Time for Dynamic Entries
Learned MAC addresses are entered in the table as dynamic entries, which means that they are subject to
aging. For any dynamic entry, if no packet arrives on the switch with the MAC address as the source or
destination address within the timer period, the address is removed from the table. The default aging time
is 1800 seconds.
Set the Aging Time for Dynamic Entries on a VLAN
Set the Aging Time for Dynamic Entries on a VLAN is available only on platform: e
Task Command Syntax Command Mode
Clear a MAC address table of dynamic entries.
• address deletes the specified entry
• all deletes all dynamic entries
• interface deletes all entries for the specified
interface
•
vlan deletes all entries for the specified VLAN
clear mac-address-table dynamic
{address | all | interface | vlan}
EXEC Privilege
Task Command Syntax Command Mode
Disable MAC address aging for all dynamic
entries.
mac-address-table aging-time 0
CONFIGURATION
Specify an aging time. mac-address-table aging-time seconds
Range: 10-1000000
CONFIGURATION
Task Command Syntax Command Mode
Specify an aging time. mac-address-table aging-time seconds
Range: 1-1000000
INTERFACE VLAN
FTOS Behavior: The time elapsed before the configured MAC aging time expires is not precisely as
configured. For example, the VLAN configuration mac-address-table aging-time 1, does not remove
dynamic entries from the CAM after precisely 1 second. The actual minimum aging time for entries is
approximately 5 seconds because this is the default MAC address table scanning interval. Therefore,
MAC aging configurations of less than 5 seconds, as in this example, might be ineffective. Configuring
mac-address-table station-move time-interval 500, solves this limitation. Reducing the scanning interval
to the minimum, 500 milliseconds, increases the detection speed, which results in FTOS clearing
entries closer to the actual desired aging time.