Planet GS-5220-16S8C User Manual page 286

The Page includes the following fields:
Object
 Mode of ARP Inspection
Configuration
 Port Mode Configuration
Figure 4-12-13: ARP Inspection Configuration Screen Page Screenshot
Description
Enable the Global ARP Inspection or disable the Global ARP Inspection.
Specify ARP Inspection is enabled on which ports. Only when both Global
Mode and Port Mode on a given port are enabled, ARP Inspection is enabled
on this given port. Possible modes are:

Enabled: Enable ARP Inspection operation.

Disabled: Disable ARP Inspection operation.
If you want to inspect the VLAN configuration, you have to enable the setting
User's Manual of GS-5220-16S8C & GS-5220-16S8CR
286