在差別性服務/多重協定標籤交換網路提供良好的服務

差別性服務網路主要是將不同的訊務流分類並分配不同的網路資源來提供服務品質。多重協定標籤交換提供快速封包交換及流量工程確保了端點對端點的服務品質。因此，結合差別性服務及多重協定標籤交換流量工程就可以為每一類訊務保留頻寬，在最佳化使用網路資源的同時給予完整的服務品質保證。在IP的差別性服務網路進入節點，封包會被分類且標示差別性服務碼點在IP標頭，當此封包進入差別性服務多重協定標籤交換網路，在入口標籤交換路由器使差別性服務碼點與多重協定標籤交換標頭中的標籤及EXP欄位映對，核心路由器會依據多重協定標籤交換標籤來當作佇列及排程，而EXP欄位決定丟掉封包的優先權。本篇論文提出在差別性服務/多重協定標籤交換網路中提供良好的服務機制，整合最早到期優先排程機制和空間優先緩衝器管理機制，利用最早到期優先來分類各種流量的端點對端點延遲，而空間優先緩衝器管理則用來分類各種流量的遺失率，進而在差別性服務/多重協定標籤交換網路上提供任意延遲和遺失率的流量，使得特定的訊務流能得到最好的服務。本論文在ns-2上模擬驗證，從結果中得知可以使特定的訊務流得到良好的差別性服務，未來可以應用在服務供應商的核心網路。

關鍵字

差別性服務；多重協定標籤交換；服務品質；最早到期優先

並列摘要

Differentiated Service (DS) network mainly provides Quality of Service (QoS) by classifying different traffic flows and assigning different network resources. Multiprotocol Label Switching (MPLS) provides fast packet switching and the opportunity for traffic engineering to assure the QoS in terms of end-to-end delay. Accordingly, the combination of DS and MPLS-TE enables bandwidth reservation for each class of traffic. The result is the ability to give strict QoS guarantees while optimizing use of network resources. At DS ingress node, packets are classified and marked with DS codepoint (DSCP) in IP header. When packets enter the DS/MPLS domain, the ingress LSR may use the label to determine the queuing and scheduling mechanism and the EXP field determines drop priority. This thesis proposes that the combination of Earliest Deadline First (EDF) scheduling algorithm and space priority buffer management mechanism provides the good of service in DS/MPLS. This study is to use the EDF to schedule different end-to-end delay of traffic flows. In the meantime, space priority buffer management is utilized to categorize the loss rate of different traffic flows. As a result, our schemes provide any delay time and loss rate of traffic flows in DS/MPLS network and make the specific traffic flow to achieve the good of service. By using ns-2 stimulator, this study concludes that the certain traffic flow is able to get the good of service in DS domain. In the future, it can be applied to the core network of service provider.

並列關鍵字

Differentiated Service ； MPLS ； QoS ； Earliest Deadline First

參考文獻

[9]M. Saleh and Z. A. Othman, "Robustness Results for Hierarchical Diff-EDF Scheduling upon Heterogeneous Real-Time Packet Networks," Journal of Computer Science, vol. 3, 2007, pp. 289-296.

[10]T. M. Lim, B. S. Lee and C. K. Yeo, "Quantum-Based Earliest Deadline First Scheduling for Multiservices," IEEE Transactions on Multimedia, vol. 9, no. 1, 2007, pp. 157-168.

[11]K. Zhu, Y. Zhuang and Y. Viniotis, "Achieving End-to-end Delay Bounds by EDF Scheduling without Traffic Shaping," IEEE INFOCOM, vol. 3, 2001, pp. 1493-1501.

[13]J. Postel, "Internet Protocol," IETF RFC 791, 1981.

[14]W. Stallings, Data and Computer Communications 7th edition, Pearson Prentice Hall, 2004, pp. 648-657.

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在差別性服務/多重協定標籤交換網路提供良好的服務

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