Configure the Spanning Tree Mode

Specifies the Multiple Spanning Tree Protocol (MSTP) or Rapid Spanning Tree Protocol (RSTP) mode. If you do not specify a protocol, the switch uses the default mode, which is mstp. If you change the spanning tree mode, you must save the current configuration and restart the switch.

Procedure

Enter Global Configuration mode:

enable

configure terminal
Configure the STP mode:

boot config flags spanning-tree-mode {mstp | rstp}

Example

Configure the STP mode:

Switch:1(config)# boot config flags spanning-tree-mode mstp

Warning: Please save the configuration and reboot the switch
         for this to take effect.
Warning: Please carefully save your configuration files before
         starting configuring the switch in RSTP or MSTP mode.