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You are here: Home / SWITCH / Module 3 / 802.1D Spanning Tree Protocol – Spanning Tree Port States

802.1D Spanning Tree Protocol – Spanning Tree Port States

The Spanning Tree Algorithm defines a number of states that a port under STP control will progress through before being in an active forwarding state. These port states are as follows:

  • Blocking
  • Listening
  • Learning
  • Forwarding
  • Disabled

A port moves through these states in the following manner:

  1. From initialization to Blocking
  2. From Blocking to either Listening or Disabled
  3. From Listening to either Learning or Disabled
  4. From Learning to either Forwarding or Disabled
  5. From Forwarding to Disabled
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