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How a Spanning Tree Works
by Global Knowledge

This paper focuses on Spanning Tree Protocol (STP), IEEE Standard 802.1D. But first, it's important to understand the functions of an Ethernet LAN switch:
  • Address learning
  • Address filtering
  • Forwarding of frames
  • Loop avoidance


The way a switch learns Ethernet (MAC) addresses is by inspecting the Ethernet frame and recording the source MAC address in a dynamic table. The switch will also associate a learned MAC address with a port. It can then mak...

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