Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.112.0P1 - Page 566

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 • Configuring Spanning Trees as Hitless 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# Adding and Removing Interfaces To add and remove interfaces, use the following commands. To add an interface to the MSTP topology, configure it for Layer 2 and add it to a VLAN. If you previously disabled MSTP on the interface using the no spanning-tree 0 command, to enable MSTP, use the following command. 566 Multiple Spanning Tree Protocol (MSTP)