隨著網際網路的迅速成長，網路上新的服務與應用也不斷地出現，為了應付各式各樣的需求，許多擁有特定功能的網路設備不斷地推出。在日益複雜的網路環境之下，管理這些越來越多的網路設備是日益困難的，對這些網路設備如何做有效的管理與利用也顯得越來越重要;然而，提供網路服務的前提是網路不能發生錯誤，或是網路具有容忍發生錯誤的能力，而網路發生錯誤的原因大多是網路設備本身發生故障，一旦網路設備發生錯誤，可能會造成網路上的各種服務和連線中斷，新的連線也將無法建立，而位於出口端的網路設備對於內部網路對外連線是否正常扮演著非常關鍵性的角色，因此本論文針對網路出口端，在機架式平台之下設計並且實作一套提供政策性服務管理及容錯系統，在此系統上網路設備以「模組」的形式嵌入至機架式的平台上，所提出的系統能提供管理者依據不同的管理政策動態地控制網路上的交通，能針對不同的網路應用程式依據不同的需求提供在系統中走不同路徑，來獲得不同的服務;系統也能對網路設備提供容錯的能力，能夠自動地將網路交通導到備援的網路設備減少管理的負擔。本論文採用Vitesse的IQ2000網路處理器作為系統程式開發平台，網路處理器為一特別針對網路資料處理而設計的處理器，有硬體處理快速的優點，並保有軟體設計時的彈性；而機架式的網路平台更具擴充性，可以整合多種網路服務成為一個多元化服務系統。最後，我們也經由實際測試証明了系統的可行性與效能。

With rapid growth of Internet, the variety of applications is used on Internet. In order to meet all kinds of requirements, many network equipments with specific functions are widely introduced in today’s network. As Internet gets more and more complex, the network management becomes an important topic. However, offering any kind of network service and applications is based on the premise that the network is fault-free or the fault is tolerable. The most common failure is on the network equipments itself. Moreover, network equipments located at the entrance of a network play an important role in the network availability. Therefore in this thesis, we design and implement a policy-based service management system on a chassis-based platform to provide gigabit level multi-service in the entrance of a network. The purposed system architecture could provide policy-based flow routing and fault-tolerance. With flow routing, the flows could be classified to meet different service requirements.
The thesis adopts the Vitesse IQ2000 Network Processor as development platform to implement the proposed system. By using the Network Processor, most work can be executed by hardware. This can reduce operating time, improve processing speed, and increase system performance. Moreover, we integrate the Network Processor-based system as a module into the chassis-based platform that is scalable for integrating the other service into the multi-service platform. Finally, experimental results prove that our system has good performance and is feasible.

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