What is a BPDU?

Can anyone please explain what is a BPDU?

Bridge protocol data unit which is used to keep maintaining the loop free topology in the network by sending the BPDU message in every 2 seconds.

A BPDU (Bridge Protocol Data Unit) is a type of network message that is used in the Spanning Tree Protocol (STP) to prevent loops in network topologies.

BPDUs contain information that is shared among switches within an Ethernet network to organize and maintain a loop-free path through the network.

BPDUs are used for establishing a root bridge, calculating the best path through the network, and updating the network topology as changes occur.

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