Displaying Mac Address Table Information - 3Com 4210 PWR Configuration Manual

136 C 13: MAC A
HAPTER
Setting the Maximum
Number of MAC
Addresses a Port Can
Learn
Displaying MAC
Address Table
Information
T M
DDRESS ABLE ANAGEMENT
Table 92 Set aging time of MAC address entries
Operation
Enter system view
Set the aging time of MAC
address entries
Normally, you are recommended to use the default aging time, namely, 300
seconds. The no-aging keyword specifies that MAC address entries do not age
out.
n
MAC address aging configuration applies to all ports, but only takes effect on
dynamic MAC addresses that are learnt or configured to age.
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 learnt 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.
Table 93 Set the maximum number of MAC addresses a port can learn
Operation
Enter system view
Enter Ethernet port view
Set the maximum number of
MAC addresses the port can
learn
To verify your configuration, you can display information about the MAC address
table by executing the display command in any view.
Table 94 Display MAC address table information
Operation
Display information about the
MAC address table
Display the aging time of the
dynamic MAC address entries
in the MAC address table
Command
system-view
mac-address timer { aging
age | no-aging }
Command
system-view
interface interface-type
interface-number
mac-address
max-mac-count count
Command
display mac-address [
display-option ]
display mac-address
aging-time
Description
-
Required
The default aging time is 300
seconds.
Description
-
-
Required
By default, the number of the
MAC addresses a port can
learn is not limited.
Description
The display command can be
executed in any view.