[First published on Fortinet Interest Group at LinkedIn]
Two FG60D (NAT/route-mode) in HA - connected as attached sketch. This works fine, except from the dashed lines. If I create one virtual switch for purple and one for green lines, I get an ethernet loop. So - I could enable stpforward on the interface. This does not make any difference. The doc states that I could enable spanning-tree on "low-end FortiGate units that are in "switch mode" - but this is not possible (http://bit.ly/2gyFYtt). (Is "switch mode" another word for transparent mode?) Then I could use redundant interfaces - but this is not available on models below FG100D.
So - does this mean that this setup is not possible to achieve? The doc is vague at best on this.
