網際網路發展至今技術已相當成熟，眾多的使用者以及終端裝置使用網路服務時，產生了不計其數的資料流量傳遞於網路中。各式各樣的網路服務會製造許多不同類型的網路流量，各類型的網路流量對於網路資源的需求以及路徑傳輸效能亦不盡相同，若能針對不同的網路流量提供適當的傳輸路徑，並根據網路壅塞狀況動態地調整網路資源的分配，即可提升整體網路服務品質，減緩網路壅塞時對網路流量造成的影響，使整體網路資源利用能夠最大化。

近年來，軟體定義網路相關研究相當興盛，有別於傳統網路架構，在軟體定義網路中控制層與傳輸層分離，以邏輯集中式的方式控管網路，可程式化操作的特色提供了比傳統網路更具彈性、更便利的開發以及管理方式。藉由軟體定義網路架構帶來的優點，此論文於混合式軟體定義網路中的控制器設計與實作服務差異化路由機制與類搶佔式資源管理機制，並且整合路由交換以及控制器溝通模組提供跨網域路由交換功能，在多網域相連的網路環境中，對於網路流量提供差異化流量處理以及具適應性管理網路資源，為多樣化的網路流量提升服務品質，減緩網路壅塞帶來的影響。

Nowadays, Internet is a well-developed and essential technology. A huge amount of data traffic is generated by numerous users and network appliances existing in the Internet. The nature and requirements for networking resources are distinct among various network services. ISPs have to think about how to fulfill the QoS requirements of networking services in different service type with limited networking resources.

Recently, Software-Defined Networking(SDN) has become a popular reaching topic. In contrast of legacy network, the control plane is separated from networking appliance and managed in logically centralized means. The network administrators can thus manage their networks with global intelligence. Moreover, with the characteristic of programmability, control entities can be developed in more elastic and agile ways. To improve overall network performance of managed networks, we design a DiffServ Routing mechanism and a Preemptive-Like Resource Management mechanism based on SDN architecture. These two mechanisms support appropriate QoS routing treatment and adaptive bandwidth resource management respectively in hybrid SDN environment, so that we can utilize networking resources more efficiently and mitigate network congestion. The two mechanisms are implemented as modules in SDN controller. Furthermore, we implement other modules to support network monitoring, routing information exchange and inter-controller communication. By integrating all developed modules, we construct a collaborative traffic engineering system. The experimental results show that the proposed mechanisms can improve network performance in different aspects as well as mitigate network congestion without interfering important network traffic.

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