STP 端口状态
• 概述
当配置消息通过交换网络时会出现延迟。结果，拓扑结构改变会发生在交
换网的不同时间和不同地点。当端口从不参与生成树拓扑结构直接变为转
发状态，就可能形成短暂的数据回路。因此，这些端口在变成转发状态之
前必须等待新的拓扑结构改变消息传遍整个交换网络。它们必须使用旧拓
扑结构转发的帧在网上消失。
Blocking —The Layer 2 LAN port does not participate in frame forwarding.
Listening —First transitional state after the blocking state when STP determines
that the Layer 2 LAN port should participate in frame forwarding.
Learning —The Layer 2 LAN port prepares to participate in frame forwarding.
Forwarding—The Layer 2 LAN port forwards frames.
Disabled —The Layer 2 LAN port does not participate in STP and is not
forwarding frames.
• 端口的五种状态
Chapter 3 Spanning Tree Protocol 共56页
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