What Is Per Vlan Rapid Spanning Tree Protocol?

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PVST+ (Per-VLAN Spanning Tree)—PVST+ is a Cisco addition to STP that creates a distinct 802.1D spanning-tree instance for each VLAN in the network.

IEEE 802.1w defines the Rapid Spanning Tree Protocol (RSTP). It is an STP evolution that allows for quicker convergence than STP.