在支援差異式服務的多重協定標籤交換網路上的資源配置

Abstract

交換技術為網路第二層的績效提供了一個理想的解答，而多層交換(Multilayer Switching)技術的目的都是以解決績效的問題與結合更多路由的機制為主要目標。 本研究是以服務品質作為主要評量標準，而在以支援差異服務(Differentiated Service)作為達成QoS 的主要架構的前題下，利用多重協定標籤交換技術(MPLS)為技術核心，將以連通導向的標籤交換路徑對各種不同類型的資料流作分類和路由的工作，並對各個路徑標以不同的優先權標籤，藉由MPLS能對標籤交換路徑顯路由(Explicit Routing)的能力，以冀望對一個MPLS Domain中之的網路頻寬狀況作更有效的控制，進一步能夠針對具有特殊要求的QoS提供令人滿意的服務。 論文中將針對單一路徑中的連結優先權以及多路徑中的路徑選擇行為作模擬測試，以證明在頻寬不足的情形下，對優先權較小的連結作強制重新路由的行為，將能使網路的頻寬使用率提升而資料流的服務品質也能獲得一定的保障。

Switching technology provides an ideal solution to the performance of layer 2 network, while the main goals of multi-layer switching technology are to solve performance problems and to combine more routing mechanisms. This research uses quality of service as main evaluation standard. On the premise that supporting differentiated service to achieve QoS, we use multi-protocol label switching (MPLS) as the core technology. Using connection-oriented label switching path to classify and route different types of traffic flows, and labels each path with different priority labels. By the capability of explicit routing, hoping to control the bandwidth utilization in a MPLS domain more effectively. Moreover, to provide satisfying service to some special QoS requirement. This thesis will perform some simulations on the connection priorities of a single path and multi path routing behavior. In order to prove that under the condition of insufficient bandwidth, rerouting lower priority connection will increase bandwidth utilization and the QoS of traffic flows can also have certain guarantee.