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By default, the FortiGate will sync and put VLANs back on the FortiLink after they're removed. Use the following commands on the FortiSwitch (not the FortiGate) to permanently remove VLANs:
# config switch trunk
edit "_FlInKxxxx"
set static-isl enable
set static-isl-auto-vlan disable
end
Reboot the FortiSwitch after the above command, then run the following:
# config switch interface
edit "xxxxxxx" (the ID of the FortiLink interface)
set allowed-vlans 1,xx,xx,4088-4094
end
It will still be possible to use the VLAN on the FortiSwitch, but it will be pruned off the FortiLink (trunk).
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