Setting The Mac Learning Limit; Configuring The Unknown Frame Forwarding Rule After The Mac Learning Limit Is Reached - H3C S5560S-EI Series Configuration Manual

An interval that is too short might result in removal of valid entries, which would cause unnecessary
floods and possibly affect the device performance.
To reduce floods on a stable network, set a long aging timer or disable the timer to prevent dynamic
entries from unnecessarily aging out. Reducing floods improves the network performance. Reducing
flooding also improves the security because it reduces the chances for a data frame to reach
unintended destinations.
To set the aging timer for dynamic MAC address entries:
Step
1.
Enter system view.
2.
Set the aging timer for
dynamic MAC address
entries.

Setting the MAC learning limit

This feature limits the MAC address table size. A large MAC address table will degrade forwarding
performance.
To set the MAC learning limit on an interface:
Step
1.
Enter system view.
2.
Enter Layer 2 Ethernet
interface view.
3.
Set the MAC learning limit on
the interface.
Configuring the unknown frame forwarding rule
after the MAC learning limit is reached
You can enable or disable forwarding of unknown frames after the MAC learning limit is reached.
To configure the device to forward unknown frames received on the interface after the MAC learning
limit on the interface is reached:
Step
1.
Enter system view.
2.
Enter Layer 2 Ethernet
interface view.
3.
Configure the device to
forward unknown frames
received on the interface
after the MAC learning limit
on the interface is reached.
Command
system-view
mac-address timer { aging
seconds | no-aging }
Command
system-view
interface interface-type
interface-number
mac-address max-mac-count
count
Command
system-view
interface interface-type
interface-number
mac-address max-mac-count
enable-forwarding
25
Remarks
N/A
The default setting is 300
seconds.
The no-aging keyword disables
the aging timer.
Remarks
N/A
N/A
By default, the MAC address table
size is not limited on an interface.
Remarks
N/A
N/A
By default, the device can forward
unknown frames received on an
interface after the MAC learning
limit on the interface is reached.