Administrator Guide

Dell Networking Term IEEE Specication
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.
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
• Enable BPDU Filtering Globally
• Conguring 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 Congurations
Enabling PVST+
When you enable PVST+, the Dell 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
Per-VLAN Spanning Tree Plus (PVST+)
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