Switching Between Non-MSTP, MSTP, and MSTP+ Modes

Use the mstp scope command to switch between non-MSTP, MSTP, and MSTP+ modes. This allows you to move between modes without explicitly removing the current mode and reconfiguring the new mode.
When an MSTP instance is enabled, you can configure the pvst and all keywords to switch between modes.
  1. When the mstp scope all command is configured and MSTP mode is active, change to MSTP+ mode. 
    Device(config)# mstp scope pvst
    The mode is changed to MSTP+. You can remove the VLANs from MSTP+ instances. VLANs that are removed from MSTP+ scope become free and other supported protocols can be configured.
  2. When the mstp scope pvst command is configured and MSTP+ mode is active, change to MSTP mode. 
    Device(config)# mstp scope all
    The mode is changed to MSTP. The VLANs that are already attached to MSTP+ are kept as is and all the free VLANs are attached to a CIST instance. Any protocols configured under the free VLANs are removed.
Parent topic: 802.1s Multiple Spanning Tree Protocol