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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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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#

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