Deployment Guide

Related Conguration Tasks
The following are the related conguration tasks for MSTP.
• Creating Multiple Spanning Tree Instances
• Inuencing MSTP Root Selection
• Interoperate with Non-Dell Networking OS Bridges
• Enable BPDU Filtering Globally
• Modifying Global Parameters
• Conguring an EdgePort
• Flush MAC Addresses after a Topology Change
• Debugging and Verifying MSTP Congurations
• Prevent Network Disruptions with BPDU Guard
• 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.
PROTOCOL MSTP mode
no disable
Example of Verifying MSTP is Enabled
To verify that MSTP is enabled, use the show config command in PROTOCOL MSTP mode.
Dell(conf)#protocol spanning-tree mstp
Dell(config-mstp)#show config
!
protocol spanning-tree mstp
no disable
Dell#
Creating Multiple Spanning Tree Instances
To create multiple spanning tree instances, use the following command.
A single MSTI provides no more benet than RSTP. To take full advantage of MSTP, create multiple MSTIs and map VLANs to them.
• Create an MSTI.
PROTOCOL MSTP mode
msti
Specify the keyword vlan then the VLANs that you want to participate in the MSTI.
520
Multiple Spanning Tree Protocol (MSTP)