MSTI
Multiple Spanning Tree
Instances control the topology inside an MSTP region. An MSTI is a spanning tree domain that
operates within a region and is bounded by that region; and MSTI does not exchange BPDUs or
send notifications to other regions. You can map multiple VLANs to an MSTI; however, each
VLAN can belong to only one MSTI. You can configure up to 64 MSTIs in an MSTP
region.