How a Spanning Tree Works
sponsored 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 make intelligent forwarding decisions based on the destination MAC address. This white paper illustrates the process.

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