Chapter 10 Install and System Administration for FortiOS 5.0 : VLANs : VLANs in transparent mode : Configure the Cisco switch and router : Configure the Cisco switch
  
Configure the Cisco switch
On the VLAN switch, you need to define VLAN_100 and VLAN_200 in the VLAN database and then add a configuration file to define the VLAN subinterfaces and the 802.1Q trunk interface.
Add this file to the Cisco switch:
interface FastEthernet0/3
switchport access vlan 100
!
interface FastEthernet0/9
switchport access vlan 200
!
interface FastEthernet0/24
switchport trunk encapsulation dot1q
switchport mode trunk
!
The switch has the following configuration:
Port 0/3
VLAN ID 100
Port 0/9
VLAN ID 200
Port 0/24
802.1Q trunk
See Also
Configure the Cisco switch and router
Configure the Cisco router
Test the configuration