Configuring PVST+ and RPVST+ - Cisco
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/lanswitch/configuration/xe-3s/asr903/lanswitch-xe-3s-asr903-book/lanswitch-xe-3s-asr903-book_chapter_0110.pdf
WEBRSTP. The most common initial deployment of MSTP is in the backbone and distribution layers of a Layer 2 switched network. For more information, see Multiple Spanning Tree Protocol chapter. For information about the number of supported spanning-tree instances, see Restrictions for PVST+ and RPVST+, on page 9.
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