Administrator Guide

Implementation Information
• The Dell EMC Networking OS implementation of PVST+ is based on IEEE Standard 802.1w.
• The Dell EMC 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 EMC 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).
NOTE: Dell EMC Networking OS supports upto 64 VLANs or instances and the number of virtual ports (number of
VLANs * interface groups) must not exceed 64 in a L2 and L3 scaled environment and 128 in L2 only environment.
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 EMC 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
Disabling PVST+
To disable PVST+ globally or on an interface, use the following commands.
• Disable PVST+ globally.
PROTOCOL PVST mode
disable
• Disable PVST+ on an interface, or remove a PVST+ parameter configuration.
INTERFACE mode
no spanning-tree pvst
592
Per-VLAN Spanning Tree Plus (PVST+)