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

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#### MSTP Overview

SEFOS MSTP enables you to group VLANs into an STI, with each instance having a spanning-tree topology independent of other STIs. You can group VLANs, or you can associate them to spanning tree instances. The topology of one instance can be independent of other instances. This situation provides multiple forwarding paths for data traffic and enables load balancing, thereby improving the fault tolerance of the overall network, since failure in one instance does not affect the other instances. This situation facilitates VLAN bridges to use multiple spanning trees, providing for traffic belonging to different VLANs to flow over potentially different paths within the virtual bridged LAN.

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