HA-mode FortiGate units managing a FortiSwitch two-tier topology
The distribution FortiSwitch unit connects to the master and slave FortiGate units. The FortiLink port(s) and interface type must match on the two FortiGate units.
NOTE: Before FortiOS 6.2.0, when using HA-mode FortiGate units to manage FortiSwitch units, the HA mode must be active-passive. Starting in FortiOS 6.2.0, the FortiGate HA mode can be either active-passive or active-active.