H3C Technologies H3C S5560 Series Switches - Manual (Page 21)

6
Step Command Remarks
3. Set the maximum number of
dynamic ARP entries for the
interface.
arp max-learning-num number
By default, an interface can learn a
maximum of 16384 dynamic ARP
entries.
If the value of the number argument is set
to 0, the interface is disabled from
learning dynamic ARP entries.
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 disables the device from supporting dynamic ARP entries that
contain multicast MAC addresses. The device cannot learn dynamic ARP entries containing multicast
sender MAC addresses. You cannot manually add static ARP entries containing multicast MAC
addresses.
When this function is disabled, ARP entries containing multicast MAC addresses are supported. The
device can learn dynamic ARP entries from ARP packets containing multicast sender MAC addresses.
You can 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.
Enabling ARP logging
This function enables a device to log ARP events when ARP cannot resolve IP addresses correctly. The
device can log the following ARP events:
• On a proxy ARP-disabled interface, the target IP address of a received ARP packet is not one of the
following IP addresses: