I've read that all ethernet switches in a MST Region need the same Name, Revision number, and list of member vlans for each Instance. So what happens when you need to change the range of VLANs in a MSTI ? Let's say that you need to add a range of vlans to an instance that spans 20 switches? How would you do that?
It sounds like modifying the MSTI vlan list will cause a 30-second loss of forwarding on all non-edge ports of the switch you're configuring, regardless of whether you work from the leaves to the root, or from the root to the leaves.