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Table 48. Spanning Tree Versions Supported
Dell Networking Term IEEE Specification
Spanning Tree Protocol (STP) 802 .1d
Rapid Spanning Tree Protocol (RSTP) 802 .1w
Multiple Spanning Tree Protocol (MSTP) 802 .1s
Per-VLAN Spanning Tree Plus (PVST+) Third Party
Implementation Information
• The Dell Networking OS implementation of PVST+ is based on IEEE Standard 802.1w.
• 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.
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
• PVST+ in Multi-Vendor Networks
• Enabling PVST+ Extended System ID
• PVST+ Sample Configurations
Enabling PVST+
When you enable PVST+, the system instantiates STP on each active VLAN.
1. Enter PVST context.
PROTOCOL PVST mode
protocol spanning-tree pvst
2. Enable PVST+.
PROTOCOL PVST mode
Per-VLAN Spanning Tree Plus (PVST+)
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