Concept Guide

Table 55. Spanning Tree Variations Dell EMC Networking OS Supports
Dell EMC Networking Term IEEE Specication
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 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).
Congure Per-VLAN Spanning Tree Plus
Conguring PVST+ is a four-step process.
1 Congure 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 Conguration Tasks
• Modifying Global PVST+ Parameters
• Modifying Interface PVST+ Parameters
• Conguring an EdgePort
• Flush MAC Addresses after a Topology Change
• Prevent Network Disruptions with BPDU Guard
• Enabling SNMP Traps for Root Elections and Topology Changes
• Conguring Spanning Trees as Hitless
• PVST+ in Multi-Vendor Networks
• Enabling PVST+ Extended System ID
• PVST+ Sample Congurations
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
668
Per-VLAN Spanning Tree Plus (PVST+)