Enterasys 5G1XX Guide de l'utilisateur télécharger pdf (Page 131)

Spanning Tree Protocol Parameters

Spanning Tree Concepts A-5

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.

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Enterasys 5G1XX Guide de l'utilisateur Page 131