隨著雲端運算的發展，網際網路的服務型態也隨之改變，不同於以往點對點連接之服務，雲端運算將成為未來主要的服務型態，並打破既有客戶端與伺服器端(Client/Server)之架構，形成由使用者主導之多元化服務。目前雲端運算已能提供使用者多元化且具高靈活性之應用服務，若將雲與雲之間相互連結，使之擴展形成Inter-Cloud架構，將能提供使用者更豐富之應用服務。因此本研究聚焦在跨雲端運算之負載平衡機制研究，透過軟體自訂義之方式實現網路流量分配機制，以達到Inter-cloud最佳服務品質之目標。

本研究致力於跨雲端運算之負載平衡機制研究，該研究係於各種不同的雲端系統建立效能分析機制，藉以分析雲端資源使用狀態，並同時建立雲端代理人管理機制，實現跨雲端運算之負載平衡，使雲端服務供應商能提供使用者最佳之處理效能。此外，本研究藉由軟體定義網路概念實現網路流量分配機制，從而實現Inter-Cloud動態雲端運用服務之最佳資源分配運作，藉以打破既有之網路概念，實現新一代通訊網路應用服務。

本研究提出一套跨雲端運算之負載平衡機制，並進行以下系統分析。首先，針對提出之雲端代理人管理機制進行研究分析，於負載過高之雲端服務供應者進行機制研究，根據本研究結果顯示，本研究所提出之管理機制可有效降低負載過高之雲端服務供應者，從而將雲端服務轉移至另一雲端服務供應者。其次，針對所提出之CSLA (Cloud Service Level Agreement)排程機制進行分析，根據研究結果顯示，透過本機制能有效平衡各個OpenFlow switches之負載，並於路徑使用率上與Dijkstra以及Single Path策略相互比較，能分別改善6.4%與10.8%。

With the rapid development of the Internet, cloud computing has emerged as an important issue cause of change to typical network services. Unlike conventional point-to-point connection services, cloud services will enable the goal of user-led diversified services to be achieved. Nowadays, cloud computing has provided users with diverse and highly flexible application services. In this work, various clouds are connected to each other to develop an Inter-Cloud system that offers users more diverse range of services.

This work proposes a load-balancing mechanism in an Inter-Cloud computing system to implement the service-related decision policies by analyzing the resource of cloud and utilization of OpenFlow-based SDN switches to optimal processing performance. The concept of the SDN (Software Defined Network) is used to optimize the distribution of network traffic in dynamic Inter Cloud system. This mechanism supports a new generation of communication network services to realize the goal of optimizing the quality of services in an Inter-Cloud system.

This work analyzes the proposed load-balancing mechanism in an Inter-Cloud computing system. First, it analyzes the overloading of the cloud provider with an agent-based manager mechanism. Based on the results, the agent-based manager mechanism reduces the loading of the overloaded cloud and provides services to users with another quality of service cloud. Second, this work analyzes the proposed CSLA (Cloud Service Level Agreement) scheduling. Based on the results, the proposed CSLA scheduling balances the loadings of the OpenFlow-based SDN switches and improves the route utilization by 6.4% and 10.8% achieved using Dijkstra routing and Single Path routing mechanisms .

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