Users Guide

• The Dell Networking OS implementation of PVST+ uses IEEE 802.1s costs as the default costs (as shown
in the following table). Other implementations use IEEE 802.1w costs as the default costs. If you are
using Dell Networking systems in a multivendor network, verify that the costs are values you intended.
• You can enable PVST+ on 254 VLANs. To set up VLANs, refer to Virtual LANs (VLANs).
Configure Per-VLAN Spanning Tree Plus
Configuring PVST+ is a four-step process.
1 Configure interfaces for Layer 2.
2 Place the interfaces in VLANs.
3 Enable PVST+.
4 Optionally, for load balancing, select a nondefault bridge-priority for a VLAN.
Related Configuration Tasks
• Modifying Global PVST+ Parameters
• Modifying Interface PVST+ Parameters
• Configuring an EdgePort
• Flush MAC Addresses after a Topology Change
• Prevent Network Disruptions with BPDU Guard
• Enabling SNMP Traps for Root Elections and Topology Changes
• Configuring Spanning Trees as Hitless
• PVST+ in Multi-Vendor Networks
• Enabling PVST+ Extended System ID
• PVST+ Sample Configurations
Enabling PVST+
When you enable PVST+, Dell Networking OS instantiates STP on each active VLAN.
1 Enter PVST context.
PROTOCOL PVST mode
protocol spanning-tree pvst
2 Enable PVST+.
PROTOCOL PVST mode
no disable
Per-VLAN Spanning Tree Plus (PVST+) 734