H3C S5500-SI Series Operation Manual page 1060

Configuring the Aging Timer for Dynamic MAC Address Entries
The MAC address table on your device is available with an aging mechanism for dynamic entries to
prevent its resources from being exhausted. Set the aging timer appropriately: a long aging interval may
cause the MAC address table to retain outdated entries and fail to accommodate the latest network
changes; a short interval may result in removal of valid entries and hence unnecessary broadcasts
which may affect device performance.
Follow these steps to configure the aging timer for dynamic MAC address entries:
To do...
Enter system view
Configure the aging timer for
dynamic MAC address entries
The aging timer for dynamic MAC address entries takes effect globally on dynamic MAC address
entries (learned or administratively configured) only.
Configuring the MAC Learning Limit
To prevent a MAC address table from getting so large that it may degrade forwarding performance, you
may restrict the number of MAC addresses that can be learned on a per-port, port group basis.
Follow these steps to configure the MAC learning limit:
To do...
Enter system view
Enter
Ethernet
interface
view, port
group view,
or Layer 2
aggregate
interface
view
Configure the maximum number
of MAC addresses that can be
learned on an Ethernet port view
or port group
Use the command...
system-view
mac-address timer { aging
seconds | no-aging }
system-view
Enter Ethernet
interface interface-type
interface view interface-number
Enter port group port-group manual
view port-group-name
Enter Layer 2 interface
aggregate
bridge-aggregation
interface view interface-number
mac-address
max-mac-count count
Use the command...
1-4
Remarks
—
Optional
300 by default.
Remarks
—
Required
Use any of these three
commands.
The configuration you make in
Ethernet interface view or
Layer 2 aggregate interface
view takes effect on the current
interface only; the configuration
you make in port group view
takes effect on all the member
ports in the port group.
Required
The default maximum number
of MAC addresses that can be
learned is not configured.