rapid-pvst+ and mst

[Daviid Kumer]

Hi, a question regarding the two STP variants MST and rapid-pvst+. In a network running rapid-pvst+, if we reach the limitation with rapid-pvst+ instances (128 per switch), can we just use MST concurrently with the new set of vlans? Or migration from one to the other will have to be done?

[MHM Cisco World]

PVST or MST you can not run multi STP mode in same SW
so you must use MST if you have more than 128 VLAN run in SW.