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| Sun Ethernet Fabric Operating System ### STP Administration Guide

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#### MST Region

Switches participating in MST instances must be constantly configured with the same MST configuration information. The collection of switches which have the same MST information form an MST region. This MST configuration determines the region to which each switch belongs. The configuration includes the name of the region, the revision number, and the MST VLAN-to-instance assignment map. A region can have one member or multiple members with the same MST configuration. The number of MST regions in a network is not limited, but each region can support up to 16 spanning-tree instances. A VLAN can be assigned to only one STI at a time.

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