HA-mode FortiGate units managing a stack of several FortiSwitch units

The active and passive FortiGate units both connect a FortiLink to the first FortiSwitch unit and (optionally) to the last FortiSwitch unit. The FortiLink ports and interface type must match on the two FortiGate units.

When using an aggregate interface for the active/standby FortiLink configuration, make sure the FortiLink split interface is enabled (this forces one link to be active and the rest to be standby links, which avoids loops in the network). This option can be disabled later if you enable an MCLAG. See Transitioning from a FortiLink split interface to a FortiLink MCLAG.

NOTE:

• When you are using the aggregate interface on the FortiGate unit for the FortiLink interface, the lacp-mode of the FortiLink aggregate interface must be set to static. Unless MCLAG is enabled and you are using 6.2.0 or later, see Transitioning from a FortiLink split interface to a FortiLink MCLAG for details.
• 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.