The type of a single instance Spanning Tree Protocol (STP) is known as Common Spanning Tree (CST).

Delay in receiving BPDUs is common  in large switched Common Spanning Tree (CST) networks. The delay in receiving BPDUs can cause problems like convergence time problems. Per-VLAN Spanning Tree (PVST) is a solution for these problems. Per-VLAN Spanning Tree (PVST) is a Cisco proprietary Spanning Tree Protocol (STP) which operates a separate instance of Spanning Tree Protocol (STP) for each individual VLAN. A separate instance of Spanning Tree Protocol (STP) for each VLAN helps VLAN to be configured independently and also can perform better. Per-VLAN Spanning Tree (PVST) requires Inter-Switch Link (ISL).

Per-VLAN Spanning Tree+ (PVST+) is an extension of the PVST standard. Per-VLAN Spanning Tree+ (PVST+) allows interoperability between CST and PVST in Cisco switches and support the IEEE 802.1Q standard.

 

Related Topics...

• What is Broadcast Storm

• What is Layer 2 Switching loop

• What is Bridge Protocol Data Unit (BPDU) frame

• Bridge Protocol Data Unit (BPDU) Frame Format

• What is a Root Bridge (Switch)

• What is a Root Port

• What are Port Cost, Port Priority and Path Cost Values

• How Spanning Tree Protocol (STP) select Root Port

• What is a Designated Port

• How Spanning Tree Protocol (STP) select Designated Port

• Difference between Root Port and Designated Port

• Spanning Tree Port States

• Topology Changes in Spanning Tree Protocol (STP)

• Spanning Tree Protocol (STP) Convergence

• What is Spanning Tree Protocol (STP) PortFast

• How to configure and verify Spanning Tree Protocol (STP) PortFast

• How to enable or disable Spanning Tree Protocol (STP)

• What is Rapid Spanning Tree Protocol (RSTP)

• Difference between Spanning Tree Protocol (STP) and Rapid Spanning Tree Protocol (RSTP)

 

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