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Instead of calculating a spanning tree for each VLAN. Multiple Spanning Tree uses instances and map VLANS to each instance. For Example.

• Instance 1: VLAN 100 – 200.
• Instance 2: VLAN 201 – 300.

MST works with the concept of regions. Switches that are configured to use MST need to find out if their neighbours are running MST. When switches have the same attributes they will be in the same region. It is possible to have one or more regions and here are the attributes that need to match:

• MST configuration name.
• MST configuration revision number.
• MST instance to VLAN mapping table.