Sending IP packets on a multiaccess network requires mapping from an IP address to a MAC address (physical/hardware address like 00:02:b6:34:6a:2f).
In an ethernet environment, ARP is used to map a MAC address to an IP address.
ARP dynamically binds the IP address to the correct MAC address.
You need a SSH Access to your juniper to proceed!
Show all ARP entrys:
ssg5-> get arp
Clear all dynamic entries from the ARP cache.
ssg5-> clear arp all
Also you can clear a single ARP entry:
ssg5-> clear arp 192.168.201.9