Huawei Quidway S3900 Series User Manual

Operation Manual – MAC Address Table
Quidway S3900 Series Ethernet Switches-Release 1510 Chapter 1
MAC Address Table Management
Huawei Technologies Proprietary
1-5
Caution:
When you add a MAC address entry, the port specified by the interface argument must
belong to the VLAN specified by the vlan argument in the command. Otherwise, the
entry will not be added.
1.2.2 Setting the Aging Time of MAC Address Entries
Setting aging time properly helps implement effective MAC address aging. The aging
time that is too long or too short results in a large amount of broadcast packets
wandering across the network and decreases the performance of the switch.
z If the aging time is too long, excessive invalid MAC address entries maintained by
the switch may fill up the MAC address table. This prevents the MAC address
table from varying with network changes in time.
z If the aging time is too short, the switch may remove valid MAC address entries.
This decreases the forwarding performance of the switch.
Table 1-4 Set aging time of MAC address entries
Operation Command Description
Enter system view
system-view
—
Set the aging time
of MAC address
entries
mac-address timer { aging
age | no-aging }
Required
The default aging time is 300
seconds.
This command is used in system view and applies to all ports. Aging applies to only
dynamic MAC addresses that are learnt or configured to age.
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.
1.2.3 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.
The switch directly forwards the packets destined for these MAC addresses. A MAC
address table too big in size may decrease the forwarding performance of the switch.
By setting the maximum number of MAC addresses that can be learnt from individual
ports, you can control the number of the MAC address entries the MAC address table
can dynamically maintains. When the number of the MAC address entries learnt from a
port reaches the set value, the port stops learning MAC addresses.

Huawei Quidway S3900 Series Specifications

General

Brand	Huawei
Model	Quidway S3900 Series
Category	Switch
Language	English