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16 MAC Address Learning
16.2 MAC address learning configuration
16.2.1 List of configuration commands
The following table describes the commands used to configure MAC address learning.
Table 16-5 List of configuration commands
Command name
mac-address-table aging-time
mac-address-table static
16.2.2 Setting the aging time
Points to note
You can change the aging time for MAC address learning. The setting is configured
for each switch. If you do not set the aging time, the aging time is set to 300 seconds.
Command examples
1.
(config)# mac-address-table aging-time 100
Sets the aging time to 100 seconds.
Notes
When the Layer 2 authentication functionality is also used, the aging time of 10 to
300 seconds set by this command is set to 300 seconds. For details, see (3) Aging
time when the Layer 2 authentication functionality is used in 16.1.6 Notes.
16.2.3 Configuring static entries
Because address learning is not performed for a specified MAC address, static entries can
be registered to avoid flooding due to MAC address aging. When static entries are set,
frames are always forwarded according to the registered entries. This functionality is useful
for high-traffic terminals whose ports do not move, such as servers connected directly to
the Switch.
A MAC address, VLAN, and output destination are specified for a static entry. A port or
channel group is specified as the destination.
(1) Static entries specifying a port as the output destination
Points to note
The following shows an example in which a port is specified as the output
destination.
Command examples
1.
(config)# mac-address-table static 0012.e200.1122 vlan 10 interface
fastethernet 0/1
Sets the destination for frames for the destination MAC address 0012.e200.1122 to
port 0/1 on VLAN 10.
Notes
1.
2.
246
Description
Sets the aging time for MAC address learning.
Sets a static entry.
On VLAN 10, any frames from sender MAC address 0012.e200.1122 received
by a means other than port 0/1 are discarded.
You cannot specify a VLAN that matches the VLAN that is automatically
assigned to the port by Layer 2 authentication.
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