bridge-frame forwarding protocol bpdu

BPDU stands for Bridge Protocol Data Unit. It is a message format used by the Spanning Tree Protocol (STP) to exchange information between network switches. BPDU messages are sent out by a switch to other switches in the network to detect and prevent loops in the network topology.

The bridge-frame forwarding protocol BPDU is used by switches to communicate information about their network topology and the status of their ports. BPDU messages contain information about the switch's identity, the priority of the switch, and the status of the ports. The switches use this information to determine which ports should be blocked to prevent loops.

BPDU messages are sent out periodically by switches and are used to elect the root bridge in the network. The root bridge is the switch with the lowest priority value. All other switches in the network calculate their shortest path to the root bridge and block any ports that are not part of that path. This prevents loops in the network and ensures that data is forwarded efficiently and without delay.