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Category Archives: STP

STP Implement between Switches


今天要來探討並實作STP(Spanning Tree Protocols,也可稱為802.1d[802.1p為QoS、802.1q為Trunk和802.3ad為LACP]),因為了要解決單點失誤(Single Points of Failure)且備援的問題,反而造成L2迴圈問題(廣播風暴[只有三個欄位,不像IP有TTL可以解決],進而導致網路癱瘓)、訊框(Frame)的重複傳送(浪費頻寬)與MAC Address不穩定等,所以可以透過STP來先解決此問題;而一台未設定的Switch通常預設會跑PVST+(Per VLAN Spanning Tree with 802.1d[而不是ISL]),因此剛啟動時都會閃橘燈來做檢查,其中Port啟動的狀態說明列表如下:

Processes Blocking Listening Learning Forwarding Disable
接受並處理BPDUs(Bridge Protocol Data Units) V V V V X
接收在介面上已收到的Data Frames X X X V X
轉發在介面上已收到的Data Frames X X X V X
透過Data Frames學習MAC的位置 X X V V X

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