The arp ip-conflict-detect enable command enables the switch to log IP address conflicts during IP address conflict detection.
The undo arp ip-conflict-detect enable command disables the switch from logging IP address conflicts during IP address conflict detection.
By default, IP address conflicts during IP address conflict detection are not logged.
When the IP addresses of devices on the network conflict, the CPU usage becomes excessively high and routes on the devices flap frequently. This greatly affects user services and even results in service interruption. You can run the arp ip-conflict-detect enable command to enable the switch to log IP address conflicts during IP address conflict detection. In this way, the device IP addresses can be properly managed, reducing the impact of IP address conflicts on user services.
When a device enabled with IP address conflict detection receives a non-gratuitous ARP packet from a user, the device compares the source IP address and source MAC address of the packet with the ARP entries that the device has learned. If the source IP address matches an ARP entry but the MAC address matches no ARP entry, the IP address conflict occurs. The device then generates log information to inform the user.