Configuration Guide Configuring ARP
When the ARP timeout is set to a smaller value, the mapping table stored in the ARP cache is more accurate but ARP
consumes more network bandwidth.
ARP Request Retransmission Interval and Times
The device consecutively sends ARP requests to resolve an IP address to a MAC address. The shorter the retransmission
interval is, the faster the resolution is. The more times the ARP request is retransmitted, the more likely the resolution will
succeed and the more bandwidth ARP will consume.
Maximum Number of Unresolved ARP Entries
In a LAN, ARP attacks and scanning may cause a large number of unresolved ARP entries generated on the gateway. As
a result, the gateway fails to learn the MAC addresses of the users. To prevent such attacks, users can configure the
maximum number of unresolved ARP entries.
Maximum Number of ARP Entries on an Interface
Configure the maximum number of ARP entries on a specified interface to prevent ARP entry resource waste.
Maximum Number of ARP Entries on a Board
Configure the maximum number of ARP entries on a specified slot to limit their ARP capabilities and prevent ARP entry
resource waste.
Related Configuration
Configuring the ARP Timeout
Run the arp timeout seconds command in interface configuration mode to configure the ARP timeout. The default
timeout is 3,600 seconds. You can change it based on actual situations.
Configuring the ARP Request Retransmission Interval and Times
Run the arp retry interval seconds command in global configuration mode to configure the ARP request
retransmission interval. The default interval is 1 second. You can change it based on actual situations.
Run the arp retry times number command in global configuration mode to configure the ARP request
retransmission times. The default number of retransmission times is 5. You can change it based on actual situations.
Configuring the Maximum Number of Unresolved ARP Entries
Run the arp unresolve number command in global configuration mode to configure the maximum number of unresolved
ARP entries. The default value is the maximum number of ARP entries supported by the device. You can change it based
on actual situations.
Configuring the Maximum Number of ARP Entries on an Interface
Run the arp cache interface-limit limit command in interface configuration mode to configure the maximum number of
ARP entries learned on an interface. The default number is 0. You can change it based on actual situations. This
command also applies to static ARP entries.
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