Reference Guide

652 | Per-VLAN Spanning Tree Plus (PVST+)
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FTOS supports three other variations of Spanning Tree, as shown in Table 36-1.
Implementation Information
• The FTOS implementation of PVST+ is based on IEEE Standard 802.1d.
• The FTOS implementation of PVST+ uses IEEE 802.1s costs as the default costs (Table 36-2). Other
implementations use IEEE 802.1d costs as the default costs if you are using Dell Networking systems
in a multi-vendor network, verify that the costs are values you intended.
• On the S-Series, 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 non-default bridge-priority for a VLAN. Refer to page 653.
Related Configuration Tasks
• Modify Global PVST+ Parameters
• Modify Interface PVST+ Parameters
• Configure an EdgePort
• Flush MAC Addresses after a Topology Change
• Preventing Network Disruptions with BPDU Guard on page 805
• SNMP Traps for Root Elections and Topology Changes on page 808
• Enable SNMP traps for RSTP, MSTP, and PVST+ collectively using the command snmp-server
enable traps xstp. on page 808
• PVST+ in Multi-vendor Networks on page 658
• PVST+ Extended System ID on page 658
• PVST+ Sample Configurations on page 659
Table 36-1. FTOS Supported Spanning Tree Protocols
Dell NetworkingTerm 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