Magic ARP and Low ARP Hit Rate

A high volume of Magic ARP packets, received on network interfaces, may impact on the ARP Hit Rate of UTM appliances.

Meraki APs use a "Magic ARP" to inform other APs that a client has associated.  UTM appliances could potentially attempt to discover these addresses, adding additional overhead.

You will find further details on this feature at https://documentation.meraki.com/MR/Other_Topics/MR_Access_Points_and_Magic_ARPs

To minimise the impact of Magic ARP packets, on the ARP Hit Rate, it is recommended to prevent unnecessary broadcast packets arriving at UTM network interfaces.