Setting The Maximum Number Of Mac Addresses A Port Can Learn; Displaying Mac Address Table Information - 3Com 4210 9-Port Configuration Manual

Setting the Maximum Number of MAC Addresses a Port Can Learn

The MAC address learning mechanism enables an Ethernet switch to acquire the MAC addresses of
the network devices on the segment connected to the ports of the switch. By searching the MAC
address table, the switch directly forwards the packets destined for these MAC addresses through the
hardware, improving the forwarding efficiency. A MAC address table too big in size may prolong the time
for searching MAC address entries, thus decreasing the forwarding performance of the switch.
By setting the maximum number of MAC addresses that can be learned from individual ports, the
administrator can control the number of the MAC address entries the MAC address table can
dynamically maintain. When the number of the MAC address entries learnt from a port reaches the set
value, the port stops learning MAC addresses.
Follow these steps to set the maximum number of MAC addresses a port can learn:
To do...
Enter system view
Enter Ethernet port view
Set the maximum number of
MAC addresses the port can
learn
If you have configured the maximum number of MAC addresses that a port can learn, you cannot
enable the MAC address authentication or port security functions on the port, and vice versa.
With the port MAC address configuration, the switch uses the MAC address of a port as the source
MAC address when sending the following Layer 2 PDUs out of the port:
LACP
STP
NDP/NTDP
GVRP
DLDP
Port MAC address configuration does not affect service packet forwarding.

Displaying MAC Address Table Information

To do...
Display information about the
MAC address table
Display the aging time of the
dynamic MAC address entries
in the MAC address table
Use the command...
system-view
interface interface-type
interface-number
mac-address max-mac-count
count
Use the command...
display mac-address [ display-option ]
display mac-address aging-time
1-7
Remarks
—
—
Required
By default, the number of the
MAC addresses a port can
learn is not limited.
Remarks
Available in any view