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* '''Internal Spanning-Tree Instance (IST)''': Default spanning tree instance in any MST region. All VLANs in this IST instance conform a '''single''' spanning tree [[Topology#Computer science|topology]], allowing only one forwarding path between any two nodes. It also provides the root switch for any VLAN configured switches which are not specifically assigned to a MSTI.
* '''Multiple Spanning Tree Instance (MSTI)''': Unlike IST, this kind of instance comprises all static VLANs specifically assigned to it and at least, must include one VLAN.
''While each MSTI can have multiple VLANs, each VLAN can be associated with only one MSTI
=== MSTP Regions ===
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