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19.3.3 Notes on PVST+ usage
(1) Notes on use with other functionality
For details, see 15.3 Compatibility between Layer 2 switch functionality and other
functionality.
(2) VLAN 1 (default VLAN) PVST+ and Single Spanning Tree
Single Spanning Tree and VLAN 1 PVST+ cannot be run at the same time. When Single
Spanning Tree is run, the VLAN 1 PVST+ is stopped.
(3) Prohibited configurations
Configure the Switch and switches running on Single Spanning Tree within one Spanning
Tree. Configurations using more than one Spanning Tree will not result in a valid topology.
The figure below shows an example of a prohibited configuration. In this example, because
the switch E Single Spanning Tree is connected to more than one PVST+ Spanning Tree,
the topology is not valid.
Figure 19-8 Example of a prohibited configuration with Single Spanning Tree
19 Spanning Tree Protocol
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