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Routing & Switching · Advanced

Multiple Spanning Tree Protocol (MST)

IEEE 802.1s, which maps many VLANs to a small number of RSTP-based spanning tree instances.

Definition

MST reduces CPU and BPDU load compared with per-VLAN STP. Switches in the same MST region must share the region name, revision number and VLAN-to-instance mapping. Instance 0 is the IST, which interacts with other regions through the CIST.

Example

spanning-tree mst configuration / name CAMPUS / revision 1 / instance 1 vlan 10-50

Exam tip

Any mismatch in name, revision or mapping places switches in different regions.

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