Spanning Tree Protocol operates internally with port roles, which are determined by received BPDUs and on the ports via which those BPDUs are received. Ports change their STP port states based on their assigned roles.
For example, if a port that was previously a Non-Designated Port receives the best BPDU to the Root Bridge, and is elected Root Port, the STP topology is recalculated and the port transitions from a Blocking state to a Forwarding state. RSTP defines a set of port roles for Spanning Tree ports, and these port roles are defined as follows:
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