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are configured in the switch, the MAC table will be adapted accordingly to add VLAN
information. In this case, the switch will not forward the received broadcast frames to all ports,
but forward the frames to all ports in the same VLAN.
2.
Multicast frames: If IGMP Snooping function has not been enabled, multicast frames are
processed in the same way as broadcast frames; when IGMP Snooping has been enabled, the
switch will only forward the multicast frame to the ports belonging to the very multicast group.
3.
Unicast frames: If no VLAN has been configured and the destination MAC addresses are in the
switch MAC table, the switch will directly forward the frames to the associated ports; if the
destination MAC address in a unicast frame were not found in the MAC table, the switch will
broadcast the unicast frame. When VLANs are configured, the switch will forward unicast
frames within the same VLAN. If the destination MAC address is found in the MAC table but
belongs to different VLANs, the switch can still only broadcast the unicast frame in the VLAN
it belongs to.
8.2 MAC Table Configuration
8.2.1 mac-address-table aging-time
Command: mac-address-table aging-time {<age>| 0}
no mac-address-table aging-time
Function: Sets the aging time for address mapping entries in the MAC table that have been
dynamically learnt; the "no mac-address-table aging-time" command restores the aging time to the
default time of 300 seconds.
Parameters: < age> is the aging time in seconds, the valid range is 10 to 100000; 0 for no aging.
Command mode: Global Mode
Default: The system default aging time is 300 seconds.
Usage Guide: A too short aging time results in many unnecessary broadcasts and causing
performance degradation; too long aging time will leave some obsolete entries occupying MAC
table space of. For this reason, the user should set a reasonable aging time according to the
production conditions.
If the aging time is set to 0, addresses dynamically learned by the switch will not age in time, the
addresses learned will be kept in the MAC table permanently.
Example: Setting the aging time for dynamically learned entries in the MAC table to 400 seconds.
Switch(Config)#mac-address-table aging-time 400
8.2.2 mac-address-table static
Command:
mac-address-table
<interface-name>
EES4710BD 10 Slots L2/L3/L4 Chassis Switch
static
address
<mac-addr>
183
vlan
<vlan-id>
interface
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Troubleshooting
