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What is Spanning-Tree Protocol 802.1d?

April 26, 2017Protocol spanning-tree

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What is Spanning-Tree Protocol 802.1d?

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Spanning Tree Protocol was developed to prevent routing loops in a network. If a router, bridge, or switch has more than one path to the same destination, a routing problem could occur. STP achieves this by running the Spanning Tree algorithm, detecting the presence of multiple physical paths and logically disabling (blocking-stand by mode) one ore more of the redundant links. This guarantees that only one path between network devices will be active at given time. STP uses BPDU (Bridge Protocol Data Units), which are special multicast frames that are broadcast out by all the switches on the network.