mac-address aging-time (Bridge domain view)

Usage Scenario

As network topologies change constantly, a device learns more and more MAC addresses. To avoid the explosive growth of MAC address entries, you can use the mac-address aging-time command to set a proper aging time to have the invalid MAC address entries deleted in time.

The system starts an aging timer for each dynamic MAC address entry. If the MAC address entry is not updated before the aging time expires, the entry will be deleted. If the MAC address entry is updated before the aging time expires, the aging time of the MAC address entry will be recalculated. The shorter the aging time is, the more sensitive a device is to the network changes.

The aging time of dynamic MAC address entries should be set based on the network condition and device performance.The aging time of dynamic MAC address entries in a stable network can be set longer.

• The aging time of dynamic MAC address entries in a constantly changing network can be set shorter.
• The capacity of the MAC address table on a low-end device is set smaller than that of the MAC address table on a high-end device. The aging time of MAC address entries on the low-end device can be set shorter to speed up entry aging and save space of the MAC address table.

Configuration Impact

If the aging time of dynamic MAC address entries is set to 0 seconds, the dynamic MAC address entries will not be aged and the MAC address entries in the MAC address table may grow explosively and affect device performance.

The mac-address aging-time seconds command run in the BD view takes effect in a specific bridge domain.

Precautions

After the system resets, dynamic MAC address entries are lost, whereas static MAC address entries and blackhole MAC address entries are neither aged nor lost.