Configure Gate and Manual VLAN trunks

1. On FortiSwitch, go to Switch > Port > Trunk and create four static trunks: one on port 1 (Gate-trunk), and three on the remaining ports 2, 3, and 4 (Manual-Trunk-Portx).
2. Then go to Switch > Interface > Trunk and configure the trunk's native and allowable VLAN settings.

Set the Native VLAN for each trunk to 1, and assign each trunk the native, voice, and data VLAN (1, 100, and 200).