FortiSwitch units are offline after FortiGate is upgraded from 7.4.6 or 7.6.0 to 7.6.1 or later when LLDP configuration is set to vdom/disable under the FortiLink interface.Workaround: In LLDP configuration, enable lldp-reception and lldp-transmission under the FortiLink interface, or rebuild the FortiLink interface.