This article describes a scenario where 4 Gbps link a needed to be used through a FortiDDoS device.
The FortiDDoS unit does not support LACP configuration of the ports, but LACP can be used outside the device to provide aggregated bandwidth.
The unit does not participate in LACP negotiation, neither does it parse the LACP PDUs. The following diagram shows an example of a design where LACP was configured between two switches, and FortiDDoS is implemented in between to inspect the traffic:
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