622 | Layer 2
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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
Configure a Static MAC Address
A static entry is one that is not subject to aging. Static entries must be entered manually:
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.
Task Command Syntax Command Mode
Create a static MAC address entry in the MAC address table.
mac-address-table static
CONFIGURATION
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