What does bpdu guard perform?

BPDU Guard is a feature used in Ethernet networks to protect the integrity of the Spanning Tree Protocol (STP). It prevents loops and potential network disruptions by shutting down a port if it receives a Bridge Protocol Data Unit (BPDU), which indicates that a device attempting to connect is trying to participate in STP. Typically enabled on ports connected to end devices, BPDU Guard helps maintain network stability by ensuring that only designated switches can send BPDUs.