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8.6.11 STP
Spanning Tree Protocol (STP) is a network protocol standardized by IEEE 802.1D. It helps establish
a loop-free logical topology for Ethernet network, and allows a network design to include backup
links to provide fault tolerance if an active link fails. The STP-enabled device creates a spanning
tree within a network of connected layer-2 bridges, and disables those links that are not part of
the spanning tree, leaving a single active path between any two network nodes. So that it
prevents packets from continued proliferation and endless loop in a loop network to avoid
reducing the capability of processing packets caused by receiving duplicate packets.
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