H3C Technologies H3C S10500 Series Switches - Manual (Page 37)

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To do… Use the command… Remarks
Enter system view system-view —
Configure the aging timer
for dynamic MAC address
entries
mac-address timer
{ aging seconds |
no-aging }
Optional
300 seconds by default.
The no-aging keyword disables the aging timer.
You can reduce broadcasts on a stable network by disabling the aging timer to prevent dynamic entries
from unnecessarily aging out. By reducing broadcasts, you improve not only network performance, but
also security, because you reduce the chances that a data packet will reach unintended destinations.
Configuring the MAC learning limit on ports
To prevent the MAC address table from getting too large, you can limit the number of MAC addresses
that can a port can obtain.
Follow these steps to configure the MAC learning limit on a Layer 2 Ethernet interface or all ports in a port
group:
To do… Use the command… Remarks
Enter system view system-view —
Enter interface view or
port group view
• Enter Layer 2 Ethernet interface
view:
interface interface-type
interface-number
• Enter port group view:
port-group manual
port-group-name
Required
Use either command.
Settings in Layer 2 Ethernet interface view
take effect on the interface only. Settings in
port group view take effect on all member
ports in the port group.
Configure the MAC
learning limit on the
interface or port group mac-address max-mac-count count
Required
No MAC learning limit is configured by
default.
NOTE:
•
Layer 2 aggregate interfaces do not support the mac-address max-mac-count command.
• Do not configure the MAC learning limit on any member ports of an aggregation group. Otherwise, the
member ports cannot be selected.
Displaying and maintaining MAC address tables
To do… Use the command… Remarks
Display MAC address table
information
display mac-address [ mac-address [ vlan vlan-id ] |
[ [ dynamic | static ] [ interface interface-type
interface-number ] | blackhole ] [ vlan vlan-id ]
[ count ] ] [ | { begin | exclude | include }
regular-expression ]
Available in any view
Display the aging timer for
dynamic MAC address entries display mac-address aging-time [ | { begin |
exclude | include } regular-expression ]
Available in any view