Adding link aggregation (LACP) to an SLBC cluster (FortiController trunks)

Configuring LACP interfaces on an SLBC cluster allows you to increase throughput from a single network by combining two or more physical FortiController interfaces into a single aggregated interface, called a FortiController trunk. You configure LACP interfaces from the FortiController CLI or GUI. LACP interfaces appear on worker GUI and CLI as single FortiController trunk interfaces and you can create routes, firewall policies and so on for them just like a normal physical interface. You can add up to eight FortiController interfaces to an aggregate interface. If you have split an interface, each interface in the split interface is still counted as a single interface.

It is possible to add LACP and other aggregated interfaces from the worker GUI or CLI. However, you should not do this, because these aggregated interfaces are not recognized by the FortiController and will not function properly. After combining two FortiController front panel interfaces into an LACP interface, the two front panel interfaces may continue to appear on the worker GUI and CLI. However you should not configure policies or routes or other options for these interfaces.