Configuration BPDUs are sent by LAN switches and are used to communicate and compute the Spanning Tree topology. After the switch port initialises, the port is placed into the Blocking state and a BPDU is sent to each port in the switch. By default, all switches initially assume that they are the Root of the Spanning Tree, until they exchange Configuration BPDUs with other switches. As long as a port continues to see its Configuration BPDU as the most attractive, it will continue sending Configuration BPDUs. Switches determine the best Configuration BPDU based on the following four factors (in the . . .
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