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Routing & Switching · Foundational

Per-VLAN Spanning Tree Plus (PVST+)

Cisco's STP variant that runs a separate 802.1D instance per VLAN, allowing per-VLAN root placement and load sharing.

Definition

PVST+ supports 802.1Q trunks and interoperates with standard CST through VLAN 1. Separate instances allow different VLANs to use different uplinks, but CPU and BPDU load scale with VLAN count. It is the default on many older Catalyst switches.

Example

spanning-tree mode pvst

Exam tip

Load balance by making different switches root for different VLAN groups.

Related terms