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DELL 9.7(0.0) User Manual

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Per-VLAN Spanning Tree Plus (PVST+)
Per-VLAN spanning tree plus (PVST+) is a variation of spanning tree — developed by a third party — that 
allows you to configure a separate spanning tree instance for each virtual local area network (VLAN).
Protocol Overview
A sample PVST+ topology is shown below.
For more information about spanning tree, refer to the 
Figure 99. Per-VLAN Spanning Tree
The Dell Networking OS supports three other versions of spanning tree, as shown in the following table.
708
Per-VLAN Spanning Tree Plus (PVST+)