H3C Technologies H3C S10500 Series Switches - Manual (Page 16)

5
Follow these steps to set the age timer for dynamic ARP entries:
To do… Use the command… Remarks
Enter system view system-view —
Set the age timer for dynamic ARP
entries
arp timer aging aging-time
Optional
20 minutes by default.
Enabling dynamic ARP entry check
The dynamic ARP entry check function controls whether the device supports dynamic ARP entries with
multicast MAC addresses.
When dynamic ARP entry check is enabled, the device cannot learn dynamic ARP entries containing
multicast MAC addresses.
When dynamic ARP entry check is disabled, the device can learn dynamic ARP entries containing
multicast MAC addresses.
Follow these steps to enable dynamic ARP entry check:
To do… Use the command… Remarks
Enter system view system-view —
Enable dynamic ARP entry
check
arp check enable
Optional
Enabled by default.
Configuring ARP quick update
As shown in Figure 3 , the laptop frequently roams between AP 1 and AP 2. This affects the mapping
between its MAC address and outbound interface on the switch. If the switch does not update its ARP
table immediately after the outbound interface changes, it may fail to communicate with the laptop.
Figure 3 ARP quick update application scenario
With ARP quick update enabled, the switch updates the corresponding ARP entry immediately after the
change of the mapping between a MAC address and an outbound interface to ensure nonstop data
forwarding.
Follow these steps to enable ARP quick update: