140 Fortinet Inc.
Configuring VLANs Network configuration
Figure 9: Typical VLAN network configuration
In a typical VLAN configuration, a number of physical networks could be connected to
a single IEEE 802.1Q-compliant router. The router is configured to add VLAN IDs to
the packets that it receives from each network and then route the packets out a single
interface that is connected to the FortiGate interface.
This FortiGate unit is configured with subinterfaces that include VLAN IDs that match
the VLAN IDs added by the router. When the FortiGate unit receives packets with
VLAN IDs, it directs them to the correct subinterface.