Proactive ARP detection

You can check the reachability of connected devices (within an IP subnet range) on a specified interface. To enable proactive ARP detection, configure the proactive-arp-detection statement at the [edit system arp] hierarchy level. After enabling the proactive-arp-detection statement, you can set the ARP configurations at the interface level by the setting the: host-discovery-address-range, ageing-time-out-seconds, and discovery-time-interval seconds options at the [edit interfaces interface-name family inet address ip-address] hierarchy level. Likewise, you can delete the ARP configuration settings by using the delete interfaces interface-name unit unit family inet address ip-address host-discovery address-range command.