There are five (5) states that the ports can be in for spanning tree:
•Blocking: A port in this state does not participate in the transmission of frames, thus preventing duplication arising through multiple paths existing in the active topology of the bridged LAN.
•Listening: A port in this state is preparing to participate in the transmission of frames. The transmission of frames is temporarily disabled in order to prevent temporary loops, which may occur in a bridged LAN during the lifetime of this state as the active topology of the bridged LAN changes.
•Learning: A port in this state is preparing to participate in the transmission of frames.
•Forwarding: A port in this state is participating in the transmission of frames.
•Disabled: A port in this state does not participate in the transmission of frames or the operation of the spanning tree process.
| Spanning Tree Concepts 89 |
