Administrator Guide

The Dell Networking operating system (OS) supports three other variations of spanning tree, as shown in the
following table.
Table 49. Spanning Tree Variations Dell Networking OS Supports
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.
• You can enable PVST+ on 254 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
• Enable BPDU Filtering Globally
• Configuring an EdgePort
• Flush MAC Addresses after a Topology Change
• Prevent Network Disruptions with BPDU Guard
• SNMP Traps for Root Elections and Topology Changes
• PVST+ in Multi-Vendor Networks
• Enabling PVST+ Extend System ID
• PVST+ Sample Configurations
Per-VLAN Spanning Tree Plus (PVST+) 711