Poll the switch/router
In order for FortiNAC to monitor the hosts connected to the device, it must poll the device periodically. Polling is set up automatically as devices are added to FortiNAC.
As devices are added they are evaluated. Any device that is capable of L2 polling (polling hosts) is immediately placed in either the L2 Wired Devices or L2 Wireless Devices sub-group. These are default groups that are created in the database and populated for you. The default polling interval is 10 minutes for wireless devices and one hour for wired devices.
To modify polling intervals select Network > L2 Polling. See L2 polling for additional information.