Reference Guide

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).
Topics:
• Protocol Overview
• Implementation Information
• Configure Per-VLAN Spanning Tree Plus
• Enabling PVST+
• Disabling PVST+
• Influencing PVST+ Root Selection
• Modifying Global PVST+ Parameters
• Modifying Interface PVST+ Parameters
• Configuring an EdgePort
• PVST+ in Multi-Vendor Networks
• Enabling PVST+ Extend System ID
• PVST+ Sample Configurations
Protocol Overview
A sample PVST+ topology is shown below.
For more information about spanning tree, refer to the Spanning Tree Protocol (STP) chapter.
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592 Per-VLAN Spanning Tree Plus (PVST+)