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If the system detects that MAC address moves occur frequently on an interface, you can configure
MAC address move suppression to shut the interface down. The interface automatically goes up
after a suppression interval. Or, you can manually bring up the interface.
Restrictions and guidelines
After you configure MAC address move notifications, the system sends only log messages to the
information center module. If the device is also configured with the
snmp-agent trap enable
mac-address
command, the system also sends SNMP notifications to the SNMP module.
Procedure
1. Enter system view.
system-view
2. Enable MAC address move notifications and optionally specify a MAC move detection interval.
mac-address notification mac-move [ interval interval ]
By default, MAC address move notifications are disabled.
3. (Optional.) Set MAC address move suppression parameters.
mac-address notification mac-move suppression { interval interval |
threshold threshold }
By default, the suppression interval is 30 seconds, and the suppression threshold is 3.
For the MAC address move suppression parameters to take effect, enable the MAC address
move suppression on a port.
4. Enter interface view.
{ Enter Layer 2 Ethernet interface view.
interface interface-type interface-number
{ Enter Layer 2 aggregate interface view.
interface bridge-aggregation interface-number
5. Enable MAC address move suppression.
mac-address notification mac-move suppression
By default, MAC address move suppression is disabled.
Enabling ARP fast update for MAC address
moves
About ARP fast update for MAC address moves
ARP fast update for MAC address moves allows the device to update an ARP entry immediately after
the outgoing interface for a MAC address changes. This feature ensures data connection without
interruption.
As shown in Figure 4, a mobile u
ser laptop accesses the network by connecting to AP 1 or AP 2.
When the AP to which the user connects changes, the device updates the ARP entry for the user
immediately after it detects a MAC address move.
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