臺灣博碩士論文加值系統

虛擬私有網路(Virtual Private Network ; VPN)是近年來網路應用中最受矚目的營運模式。而隨著MPLS (Multiprotocol Label Switching)技術的興起，MPLS VPN已成為熱門的研究議題。BGP/MPLS VPN是屬於第三層MPLS VPN技術，主要使用BGP(Border Gateway Protocol)在骨幹網路中進行路由資訊交換，因為BGP路由器必須遵循水平切分(Split Horizon)規則，所以每部PE路由器需要建立邏輯上的完全網狀(Full-Mesh)拓撲，以至於造成骨幹網路與PE路由器的負擔。
本論文將透過模擬BGP/MPLS VPN網路，引進路由反射技術來降低骨幹網路中PE路由器的BGP會談數目，並評估其效益。我們試著不同路由反射器的部署，從模擬結果發現增加路由反射器可以進一步分散路由反射器的工作負擔，但總體網路會增加少許的BGP會談數目。

Virtual private network (VPN) is a business mode which in the recent years has received much attention in the network application .With the growing maturity of the Multiprotocol Label Switching (MPLS) technology, MPLS VPN has become a hot issue. BGP/MPLS VPNs belong to the layer three MPLS VPN technology. It use BGP (Border Gateway Protocol) to exchange the route information in the backbone network .Because BGP routers must follow the Split Horizon rule, therefore each PE (Provider Edge) router needs to establish the Full-Mesh logical topology. This places burden on the backbone network and the PEs.
This thesis simulates the BGP/MPLS VPN network to evaluate the benefits of route reflection, which is used to reduce the number of PE’s BGP sessions in the backbone network. We try several allocations of the route reflectors. The simulation results show that increasing the number of route reflectors helps to distribute the processing loading among the route reflectors with the price of mild increase of the total number of BGP sessions.

謝誌Ⅰ
英文摘要Ⅱ
中文摘要Ⅲ
目錄Ⅳ
圖目錄Ⅵ
表目錄Ⅷ
第一章 緒論 1
1.1 研究動機 1
1.2 參考文獻 2
1.3 論文架構 3
第二章 BGP原理 5
2.1 IBGP與EBGP 5
2.2 BGP的訊息表頭格式 6
2.3 BGP的運作 8
2.4 IBGP的擴充性問題 9
2.5 BGP路由反射(Route Reflection)技術 10
2.5.1 BGP路由反射器(Route Reflector) 10
2.5.2 起源識別碼與叢集列表 13
2.5.3 路由反射器的運作 14
第三章 MPLS VPN原理 15
3.1 VPN技術概要 15
3.2 MPLS簡介 17
3.3 MPLS VPN基礎架構 19
3.4 BGP/MPLS VPN概念 20
3.4.1 VRF (VPN Routing and Forwarding Table) 20
3.4.2 RD (Route Distinguisher) 21
3.4.3 RT (Route Target) 22
3.4.4 MP-BGP (Multiprotocol Extensions for BGP-4) 23
3.5 BGP/MPLS VPN結構 23
3.5.1 路由資訊的分送過程 24
3.5.2 VPN封包的轉送過程 26
第四章 建構BGP/MPLS VPN模擬網路 28
4.1 16部PE路由器完全網狀互連的網路拓撲 29
4.2 引進路由反射器 30
4.2.1 16部PE路由器與1部路由反射器的網路拓撲 32
4.2.2 16部PE路由器與2部路由反射器的網路拓撲 33
4.2.3 16部PE路由器與4部路由反射器的網路拓撲 35
4.2.4 會談數目與BGP Traffic計算 36
第五章 模擬結果與討論 37
5.1 PE路由器的BGP Traffic比較 37
5.2 路由反射器的BGP Traffic比較 38
5.3 其它網路拓撲的模擬結果 39
5.4 綜合討論分析 43
5.4.1 配置路由反射器後PE1 BGP Traffic下降趨勢 44
5.4.2 增加配置路由反射器後RR1 BGP Traffic下降趨勢 45
5.4.3 增加配置路由反射器後所有RR BGP Traffic總和 47
第六章 結論 48
參考文獻 49

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