October 2012
Intermediate to advanced
160 pages
2h 49m
Chinese
Content preview from 802.11n技術手冊
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設計與建置一個 802.11n 網路
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在市場上許多商業產品提供了如圖 8-3 的一種結合方法。部分基於控制器的存取點可以
配置成透過集中式控制器發送資料，或是直接從 AP 到網路。部分常見的混合方法是提
供一個以每個 SSID 的基礎之選擇，使得來賓流量可以集中轉發，或是從設備連結到 AP
的 VLAN 流量，可以藉由 AP 轉發進而連結到其他 AP 的 VLAN，這必須透過控制器的
轉發引擎傳送。相同的，部分分散式資料面提供漫遊的功能，可以透過 AP 之間的通道
機制，使任何在整個網路上的 VLAN 都是可以存取的。
在任何規模的 802.11n 網路，很有可能你需要同時使用分散式資料轉發及
跨越廣播域邊界轉發無線流量。
控制面（Control plane）
控制面的位置在可取得的產品中，是大多數架構差異的來源。集中式控制面技術由來已
久，支援成熟且具備側試過的軟體，還能夠結合分散式的資料面，以有效地使用於核心
網路。大多數集中式控制面都是走向分離的控制面 ( 代表功能能夠在控制器與 AP 之間
共享 ) 或是完全分散式控制面，但常見的是當控制器從網路上被移除時，部分特性將會
不可再用。分散式控制面的成本可以變得更便宜些，特別當設計是針對擁有許多遠端網
點的分散式網路時。
控制面的位置在網路上可能對全面的可靠性和復原力有影響，也可能依據使用中的應用
與網路結構而變得重要。舉例來說，醫院逐漸將網路轉換為無線區域網路，以支援關鍵
的應用來派送醫療紀錄、從病人護理設備傳來即時的串流資料、填寫處方，甚至能夠允 ...
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