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* '''Internal Spanning-Tree Instance (IST)''': Default spanning tree instance in any MST region.All [[Virtual LAN|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 [[Virtual LAN|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 [[Virtual LAN|VLANs]] specifically assigned to it and at least, must include one [[Virtual LAN|VLAN]].
''While each MSTI can have multiple [[Virtual LAN|VLANs]], each [[Virtual LAN|VLAN]] can be associated with only one MSTI.''.
=== MSTP Regions ===
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