Panasonic GA-ML Series Manual page 185

In the section of Gratuitous ARP Transmission Interval, you can
configure the following parameter.
Parameter
Interval Time
Click Edit to edit the entry-settings.
If two or more pages exist, enter the page numbers. Then click Go to
move to a specific page.
After you click Edit, enter the time for gratuitous ARP
transmission-interval (seconds).
6 L3 Features
6.2 Gratuitous ARP
Overview
183