Configuring The Mac Learning Limit; Displaying And Maintaining Mac Address Tables - 3Com S7906E Configuration Manual

The MAC address aging timer takes effect globally on dynamic MAC address entries (learned or
administratively configured) only.
In a stable network, when there has been no traffic activity for a long time, all the dynamic entries in
the MAC address table maintained by the device will be deleted. When it happens, the device
broadcasts a large amount of data packets, which may be listened to by unwanted users, resulting
in security hazards. In this case, you can configure mac-address timer no-aging for dynamic
MAC address entries, that is, not to age out dynamic MAC address entries, thus reducing
broadcasts and ensuring the stability and security of the network.

Configuring the MAC Learning Limit

As the MAC address table is growing, the forwarding performance of your device may degrade. To
prevent the MAC address table from getting so large that the forwarding performance is affected, you
can limit the number of MAC addresses that can be learned on a port.
Follow these steps to configure the MAC learning limit on an Ethernet port, or the Ethernet ports in a
port group or ONU port:
Enter system view
Enter
Ethernet
interface
view, port
group view,
or ONU port
view
Configure the MAC learning limit on an
Ethernet port, port group or ONU port

Displaying and Maintaining MAC Address Tables

To do...
Display MAC address table
information
Display the aging timer for
dynamic MAC address entries
To do...
Enter Ethernet
interface view
Enter port group view
Enter ONU port view
display mac-address
[ mac-address [ vlan vlan-id ] |
[ [ dynamic | static ] [ interface
interface-type
interface-number ] |
blackhole ] [ vlan vlan-id ]
[ count ] ]
display mac-address
aging-time
Use the command...
system-view
interface interface-type
interface-number
port-group manual
port-group-name
interface onu
interface-number
mac-address
max-mac-count count
Use the command...
1-7
Remarks
—
Use any of these three
commands.
The configuration you make in
Ethernet interface view or ONU
port view takes effect on the
current interface only; the
configuration you make in port
group view takes effect on all
the member ports in the port
group.
Required
No MAC learning limit is
configured by default.
Remarks
Available in any view