Maximum Mac Address Number Learned By Ethernet Port And Forwarding Option Configuration - H3C S9500 Series Operation Manual

Operation Manual – System Management
H3C S9500 Series Routing Switches
If aging time is set too long, the Ethernet switch will store a great number of out-of-date
MAC address tables. This will consume MAC address table resources and the switch
will not be able to update MAC address table according to the network change.
If aging time is set too short, the Ethernet switch may delete valid MAC address table.
You can use the following commands to set the MAC address aging time for the
system.
Perform the following configuration in system view.
Table 2-2 Set the MAC address aging time for the system
Set the dynamic MAC address aging
time
Restore the default MAC address
aging time
In addition, this command takes effect on all the ports. However the address aging only
functions on the dynamic addresses (the learned or configured as age entries by the
user).
By default, the aging-time is 300 seconds. With the key word no-aging, the command
performs no aging on the MAC address entries.
Caution:
The dynamic MAC address aging is completed during the second aging cycle.
2.3 Maximum MAC Address Number Learned by Ethernet
Port and Forwarding Option Configuration
With MAC address learning, S9500 routing switches can obtain MAC addresses of
every network devices on network segments connecting to a port. As for packets
destined to those MAC addresses, the switch directly uses hardware to forward them.
An overlarge MAC address table may cause the low forwarding performance of the
switch.
You can control the number of entries of the MAC address table by setting the
maximum number of MAC addresses learned by a port. if you set the value to count,
and when the number of MAC addresses learned by the port reaches this value, this
port will no longer learn any more MAC addresses.
Operation
2-3
Chapter 2 MAC Address Table Management
Command
mac-address timer
no-aging }
undo mac-address timer aging
{ aging age |