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You are here: Home / ICND2 / Day 31 – Spanning Tree Protocol / Day 31 Tasks / Spanning Tree Port States

Spanning Tree Port States

The Spanning Tree Algorithm (STA) defines a number of states that a port under STP control will progress through before being in an active Forwarding state. 802.1D port states are as follows:

  • Blocking – BPDUs received only (20 seconds)
  • Listening – BPDUs sent and received (15 seconds)
  • Learning – Bridging table is built (15 seconds)
  • Forwarding – Sending/receiving data
  • Disabled – Administratively down

A port moves through these states in the following manner:

  1. From initialisation to Blocking
  2. From Blocking to either Listening or Disabled
  3. From . . .

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