H3C Technologies H3C S7500E Series Switches - Manual (Page 117)

9-6
To do… Use the command… Remarks
Disable MAC address learning on
an Ethernet port or port group
mac-address mac-learning
disable
Required
Enabled by default.
When global MAC address learning is disabled, the learned MAC addresses remain valid until
they age out.
For configuration about port groups, refer to Ethernet Interface Configuration in the Layer 2 - LAN
Switching Configuration Guide .
Disabling MAC address learning on a VLAN
You may disable MAC address learning on a per-VLAN basis.
Follow these steps to disable MAC address learning on a VLAN:
To do… Use the command… Remarks
Enter system view system-view —
Enable global MAC address
learning
undo mac-address mac-learning
disable
Optional
Enabled by default
Enter VLAN view vlan vlan-id —
Disable MAC address learning on
the VLAN
mac-address mac-learning
disable
Required
Enabled by default
When global MAC address learning is disabled, the learned MAC addresses remain valid until they
age out.
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. In
this way, dynamic MAC address entries that are not updated within their aging time will be deleted to
make room for new entries, and the MAC address table can be timely updated to accommodate the
latest network changes.
Set the aging timer appropriately: a long aging interval may cause the MAC address table to retain
outdated entries, exhaust the MAC address table resources, and thus fail to update its entries to