April 2015
Intermediate to advanced
372 pages
6h 56m
Chinese
Content preview from SDN: 軟體定義網路
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84 | 第 4 章：SDN 控制器
Nicira 的產品支援 OpenStack 外掛程式，用於延伸在資料中心當中，業務或資源管理的
能力。
與 OpenFlow 相關的控制器
大多數開放原始碼的 SDN 控制器，都是完全採用 OpenFlow 協定進行實作，這是因
為設計都源自於 Onix（如圖 4-7 所示）
15
。相較之下，只有少數的商業產品完全採用
OpenFlow 協定。事實上，不少商業產品都將 OpenFlow 和其他協定合併使用。
圖 4-7：Onix 控制器模型示意圖
與 VMware/Nicira 或 L3 VPN/PCE 解決方案不同，OpenFlow 解決方案不需要額外的封
裝或閘道。不過為了和 OpenFlow 及非 OpenFlow 的網路元件互動，有時候也需要進行
混合式的操作。事實上，此應用情境是目前最廣泛的需求部署模型。
除非特別說明，否則開放原始碼的 OpenFlow 控制器解決方案，都是採用記憶體駐留或
記憶體資料庫機制來儲存狀態及資訊。
Onix 與理想化 SDN 架構之間的關係
在圖 4-7 當中，說明一般開放原始碼控制器元件和理想化 SDN 架構之間的關係。大多數
控制器是採用 Onix 程式碼和架構，它們和理想化 SDN 架構之間的關係是類似的。這一
15. 請參考
http://static.usenix.org/events/osdi10/tech/full_papers/Koponen.pdf
文件。
基本概念 | 85
點會隨著各個專案發生改變。此外， ...
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