28.5.1 Overview

Single Spanning Tree and one Spanning Tree Protocol can be used to avoid loops on all VLANs, and can handle more VLANs than PVST+ controlling individual VLANs.

The figure below shows a network configuration based on Single Spanning Tree. In this figure, VLAN 10 and VLAN 20 are set for Switches A, B, and C, with PVST+ stopped on all VLANs to apply Single Spanning Tree. A single topology is used for all VLANs for communication.

Figure 28-8: Network configuration using Single Spanning Tree