Users Guide

Configure Multiple Spanning Tree
Protocol
Configuring multiple spanning tree is a four-step process.
1 Configure interfaces for Layer 2.
2 Place the interfaces in VLANs.
3 Enable the multiple spanning tree protocol.
4 Create multiple spanning tree instances and map VLANs to them.
Related Configuration Tasks
The following are the related configuration tasks for MSTP.
• Creating Multiple Spanning Tree Instances
• Adding and Removing Interfaces
• Influencing MSTP Root Selection
• Interoperate with Non-Dell Networking OS Bridges
• Changing the Region Name or Revision
• Modifying Global Parameters
• Modifying the Interface Parameters
• Configuring an EdgePort
• Flush MAC Addresses after a Topology Change
• Debugging and Verifying MSTP Configurations
• Prevent Network Disruptions with BPDU Guard
• Enabling SNMP Traps for Root Elections and Topology Changes
Enable Multiple Spanning Tree Globally
MSTP is not enabled by default. To enable MSTP globally, use the following commands.
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.
1 Enter PROTOCOL MSTP mode.
CONFIGURATION mode
protocol spanning-tree mstp
2 Enable MSTP.
Multiple Spanning Tree Protocol (MSTP) 705