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When using multiple bridges, you can enable fault tolerance and optimal packet routing, by configuring Spanning Tree Protocol (STP - IEEE 802.1d). When STP is enabled, each bridge communicates with its neighboring bridges or switches to discover how they are interconnected. This information is then used to eliminate loops, while providing optimal routing of packets. STP also uses this information to provide fault tolerance, by re-computing the topology in the event that a bridge or a network link fails.
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Dual Redundant Bridges with STP
Link Redundancy with STP