Each VLAN (Virtual LAN) participating in PVST+ must be in a separate STPD (Spanning Tree Domain), and the VLAN number (VLAN ID) must be the same as the STPD identifier (STPD ID).
As a result, PVST+ protected VLANs cannot be partitioned.
This fact does not exclude other non-PVST+ protected VLANs from being grouped into the same STPD. A protected PVST+ VLAN can be joined by multiple non-PVST+ protected VLANs to be in the same STPD.
Note
When PVST+ is used to interoperate with other networking devices, each VLAN participating in PVST+ must be in a separate STP (Spanning Tree Protocol) domain.
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