The M4300 have minimum commands for querying IP address conflicts, and for handling incoming Gratuitous ARP messages this way:
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ip address-conflict-detect run This command triggers the switch to run active address conflict detection by sending gratuitous ARP packets for IPv4 addresses on the switch.
show ip address-conflict This command displays the status information corresponding to the last detected address conflict.
clear ip address-conflict-detect This command clears the detected address conflict status information.
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ip unnumbered gratuitous-arp accept This command enables the switch to automatically configure static interface routes to an unnumbered peer when the switch dynamically receives gratuitous ARP messages. The switch uses the IP address of the loopback interface (see the ip unnumbered loopback command) as the IP address for the unnumbered peer. This behavior is enabled by default.
no ip unnumbered gratuitous-arp accept This command prevents the switch from automatically configuring static interface routes to an unnumbered peer when the switch dynamically receives gratuitous ARP messages.
