What is the result of the configuration command 'set stp-forward enable' on a FortiGate in transparent mode?

The command 'set stp-forward enable' on a FortiGate device in transparent mode allows the device to forward received Spanning Tree Protocol (STP) messages, specifically Bridge Protocol Data Units (BPDUs). This is significant for maintaining a loop-free Ethernet network topology by ensuring that STP is functional among the devices on the network.

When this command is applied, the FortiGate acts as a bridge, participating in the process of receiving and forwarding BPDUs, which are critical for the operation of the Spanning Tree Protocol. This forwarding of received STP messages is vital for other switches in the network to understand the topology and prevent loops, as it informs them about the forwarding paths and whether they should block or forward certain ports.

Thus, by enabling STP forwarding, the FortiGate aids in the overall functioning of the spanning tree algorithm in the network, allowing it to integrate smoothly with existing switches and participate in loop prevention strategies.