Understanding Multiple Spanning Tree Protocol (802.1s) - Cisco
https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/24248-147.html
Multiple Spanning Tree (MST) is an IEEE standard inspired from the Cisco proprietary Multiple Instances Spanning Tree Protocol (MISTP) implementation. This document assumes that the reader is familiar with Rapid STP (RSTP) (802.1w), as MST heavily relies on this other IEEE standard. This table shows the support for MST in various Catalyst switches:
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