Reference Guide

Multiple Spanning Tree Protocol (MSTP) | 609
4. Create Multiple Spanning Tree Instances, and map VLANs to them. See page 610.
Related Configuration Tasks
• Creating Multiple Spanning Tree Instances
• Adding and Removing Interfaces
• Influencing MSTP Root Selection
• Interoperating with Non-Dell Networking OS Bridges
• Modifying Global Parameters
• Modifying Interface Parameters
• Configuring an EdgePort
• Flushing MAC Addresses after a Topology Change
• Debugging and Verifying MSTP Configuration
• Preventing Network Disruptions with BPDU Guard
• SNMP Traps for Root Elections and Topology Changes
• Configuring Spanning Trees as Hitless
Enabling Multiple Spanning Tree Globally
MSTP is not enabled by default. To enable MSTP:
Verify that MSTP is enabled using the
show config command from PROTOCOL MSTP mode, as shown in
Figure 32-2.
Figure 32-2. Verifying MSTP is Enabled
When you enable MSTP, all physical, VLAN, and port-channel interfaces that are enabled and in Layer 2
mode are automatically part of the MSTI 0.
• Within an MSTI, only one path from any bridge to any other bridge is enabled.
• Bridges block a redundant path by disabling one of the link ports.
Step Task Command Syntax Command Mode
1 Enter PROTOCOL MSTP mode.
protocol spanning-tree mstp
CONFIGURATION
2 Enable MSTP.
no disable
PROTOCOL MSTP
Dell(conf)#protocol spanning-tree mstp
Dell(config-mstp)#show config
!
protocol spanning-tree mstp
no disable
Dell#