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Routing & Switching · Advanced

MST Region

A group of interconnected switches with identical MST name, revision number and VLAN-to-instance mapping.

Definition

Within a region, MSTIs are computed independently. Region boundaries appear as a single virtual bridge to other regions or legacy STP. A digest of the mapping table is carried in BPDUs to detect mismatches.

Example

show spanning-tree mst configuration

Exam tip

Regions are defined by configuration consistency, not physical topology.

Related terms