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A.3.5
Handling Duplicate Paths
When the active topology of the network is determined, all packets between any two nodes in the
network use only one path. Where a duplicate path exists, the non-designated port is put into a
blocking state.
A.3.6
Remapping Network Topology
If there is a change in the network topology due to a failure or the removal or addition of any active
components, the active topology also changes. This may trigger a change in the state of some
blocked ports.
The following describes the five (5) states of the ports when using 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 Protocol Parameters
Spanning Tree Concepts
A-5
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