H3C Technologies H3C S12500-X Series Switches - Manual (Page 17)

6
Setting the aging timer for dynamic ARP entries
Each dynamic ARP entry in the ARP table has a limited lifetime, called an aging timer. The aging timer
of a dynamic ARP entry is reset each time the dynamic ARP entry is updated. A dynamic ARP entry that
is not updated before its aging timer expires is deleted from the ARP table.
To set the aging timer for dynamic ARP entries:
Step Command Remarks
1. Enter system view. system-view N/A
2. Set the aging timer for dynamic ARP
entries.
arp timer aging aging-time
By default, the aging time for
dynamic ARP entries is 20 minutes.
Enabling dynamic ARP entry check
The dynamic ARP entry check function controls whether the device supports dynamic ARP entries
containing multicast MAC addresses.
When dynamic ARP entry check is enabled, the device cannot learn dynamic ARP entries containing
multicast MAC addresses, and you cannot manually add static ARP entries containing multicast MAC
addresses.
When dynamic ARP entry check is disabled, the device can learn dynamic ARP entries containing
multicast MAC addresses obtained from the ARP packets sourced from a unicast MAC address. You can
also manually add static ARP entries containing multicast MAC addresses.
To enable dynamic ARP entry check:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enable dynamic ARP entry check. arp check enable
By default, dynamic ARP entry check is
enabled.
Configuring a customer-side port
By default, the device associates an ARP entry with routing information when the device learns an ARP
entry. The ARP entry provides the next hop information for routing. To save hardware resources, you can
use this command to specify a port that connects a user terminal as a customer-side port so the device will
not associate the routing information with the learned ARP entries.
To configure a customer-side port:
Step Command Remarks
1. Enter system view. system-view N/A
2. Create a VLAN interface
and enter its view.
interface vlan-interface
vlan-interface-id If the VLAN interface exists, you
directly enter its view.