Fortinet 5003 User Manual

Add two spanning tree instances numbered the same as the instances added to 
the switch (3 and 5). Add the VLAN tags to the instances and set their priority 
values to 4096:

config switch fabric-channel stp instance

edit 3

set priority 4096
set vlan-range 103-104

next
edit 5

set priority 4096
set vlan-range 105-106

end

Add a trunk named trunk_6 that aggregates backplane slots 6, 8, 9, 10, 11, and 

13:

config switch fabric-channel trunk

edit "trunk_6"

set members "slot-6" "slot-8" "slot-9" "slot-10" 

"slot-11" "slot-13"

end

Allow VLAN packets on the FortiSwitch-5003A F7 front panel interface and the 
trunk:

config switch fabric-channel interface

edit "f7"

set allowed-vlans 1,103-106

next
edit "trunk_6"

set allowed-vlans 1,103-106

end

Enable the FortiSwitch-5003A board to listen for heartbeat packets on all of the 
interfaces connected to FortiGate-5001A boards:

config switch fabric-channel physical-port

edit "slot-6"

set heartbeat enable

next
edit "slot-8"

set heartbeat enable

next
edit "slot-9"

set heartbeat enable

next
edit "slot-10"

set heartbeat enable

next
edit "slot-11"

set heartbeat enable

next
edit "slot-13"

set heartbeat enable

end

Note: The priority values of both spanning tree instances should be lower on the 
FortiSwitch-5003A board in slot 1 than on the board in slot 2 so that spanning tree directs 
all traffic to the board in slot 1.