由於全球網路持續以極快地速度在成長，越來越多新興網路應用讓我們的生活變得更加進步便利。然而在網路規模成長的同時也增加了創新研究的困難度。對於研究人員來說，如何在不影響公眾網路運作的前提下去進行新技術的探索與實作成為了一個重要的課題。雖然在系統開發階段使用模擬器去建立實驗和追蹤網路狀態的變化是一個常見的方式，然而在進行驗證與評估的時候，特別是針對廣域和大型架構的網路實驗，模擬器有可能會無法準確地呈現出真實網路環境，讓研究人員能夠完整地觀測系統運作時的變化。在這種情況下，運用虛擬化技術建置的仿真網路測試平台不失為一個好選擇來滿足實驗環境佈署的需求，讓研究人員能夠在不影響工作網路的前提下使用仿真環境去重複進行網路架構、控制策略、通訊協定和應用等等的實驗。

近年來，軟體定義網路概念的提出，催生了許多使用上層應用軟體去觸發底層網路控制與佈署的新技術。此概念的特點包含了控制層與資料層的分離、集中式的邏輯控制單元和全域的網路狀態觀測。軟體定義網路和傳統網路不同的地方在於架構中管理網路元件的控制器以及基於封包流的流量轉發規則。此一架構除了增加網路運作的可程式化和可擴充性以外，同時也能讓網路維運人員透過操作軟體定義網路控制器去啟用不同的封包流轉發策略在底層網路元件上。目前許多網路測試平台已經在使用軟體定義網路的概念去實作網路架構虛擬化，進而支援測試平台上未來網路相關的研究。

本論文回顧了網路架構虛擬化的相關議題，並介紹了建置支援OpenFlow協定的軟體定義網路測試平台所需要的基礎知識。論文中提出了一個基於學術研究網路之大型跨網域測試平台的規劃，包含了系統架構、站台資源的整合運用以及如何管理與操作測試平台上的元件等細節。針對接取分散在不同地方站台網路的需求，測試平台的軟體定義網路控制器中實作了數個模組，讓控制器能夠配置交換器上的封包流規則去轉發實驗流量。此外亦提出了一個概念性驗證的設計，軟體定義路由交換，去加強實驗網路跨站台傳輸路徑之可調整性。論文中同時也介紹了目前的實作成果和應用範例，印證所建置的網路測試平台能夠支援軟體定義網路相關的研究與教學。

As the global network continues to grow in a fast path, there are more and more network appliances leveraged by new technologies implemented to improve our daily life. While the expansion of the global network increases the difficulty in exploring innovations. How to evaluate ideology and practicality without making influences on public network becomes a crucial task for researchers. Using simulator to model network status and track properties is a common way to conduct network experiments. However, when it comes to production test, the simulation environment may not fulfill the requirements of observing the status and behavior in operation completely, especially for wide-area and large-scale experiments. Under this circumstance, network emulation testbed provides a place to satisfy such a requirement with virtualization technologies. By using the testbed, network innovations such as new architectures, control policies, protocols, and applications are able to be implemented in emulated environments for experimenting without fear of affecting production network.

Nowadays, Software-defined Networking (SDN) is considered a new solution in network provision and management. The characteristics of SDN include separated control as well as data planes, centralized control logic, and global view. Different from legacy network architecture, SDN uses controller to enable flow-based forwarding rules for improving programmability and scalability of the network. By doing this, network operators can easily manage the controller to setup control policies on underlay network components. Nowadays, using SDN concepts to achieve network virtualization is often used in controlling experiment network traffic in large-scale network testbeds for supporting future internet researches.

This dissertation reviews the related issues associated with network virtualization, illustrating the knowledge of building the network emulation testbed, and proposes a design of OpenFlow-enabled testbed over research and education networks. According to the requirements of traffic forwarding among testbed sites, several control modules are developed to let the controller manage SDN switches to stitch these sites over several research and education networks. There is also a proof-of-concept, software-defined routing exchanges, proposed to get over the integration problem of data exchange among distributed testbed sites and enhance the adaptation of path selection. The dissertation introduces the state-of-the-art of system architecture, interoperability of orchestrating site resources, and the way of managing hardware components of distributed testbed sites. The evaluation results and use cases show that the implemented testbed is able to support SDN research and education.

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