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    Please use this identifier to cite or link to this item: http://ccur.lib.ccu.edu.tw/handle/A095B0000Q/781

    Title: 設計與實作VNF服務串列最佳佈署與最佳路由之協調系統於NFV/SDN資料中心;Design and Implementation of An Orchestration System to Support Optimal Placement and Routing for VNF Service Chaining in NFV/SDN Cloud Center
    Authors: 陳柏瑞;Chen, Bo-Rui
    Contributors: 通訊工程研究所
    Keywords: SDN;NFV;網路最佳化;SDN;NFV;Network Optimization
    Date: 2017
    Issue Date: 2019-07-17 10:47:49 (UTC+8)
    Publisher: 通訊工程研究所
    Abstract: 網路功能虛擬化(Network Function Virtualization, NFV)技術將傳統實現於實體網路設備之功能,以虛擬化技術實現於伺服器中虛擬機,稱此擁有網路功能的虛擬機為Virtual Network Function (VNF),使用者可指定由多個VNF依序串接所形成之服務串列,稱此服務串列為Service Chain (SC),在資料中心中若對於使用者每次申請SC,皆佈署新的VNF進入環境,會使環境存在過多VNF,增加環境複雜度,提高管理成本。若佈署VNF的伺服器擺放位置相距過遠或路由路徑選擇不佳,皆會使SC路由路徑增長,浪費環境中網路頻寬。 利用OpenStack虛擬機管理軟體搭配SDN技術,可達到佈署SC的功能,但OpenStack控制器與SDN控制器之間目前並無協調系統進行溝通,導致管理者操作不易,因此本文在SDN環境中實作一套中央協調系統(Central Orchestration System, COS),COS中包含網路最佳化程式,根據使用者SC需求以及環境現況,計算出是否為需求佈署VNF與佈署的位置以及SC的路由路徑,得到最佳的管理成本與路由成本,再透過OpenStack與SDN控制器實際佈署在環境中,供使用者使用。COS同時解決了管理者對SDN控制器與OpenStack控制器操作不易的問題。系統內的最佳化程式在48-ary Fat Tree環境中,當伺服器資源與網路資源僅20%可用時,120秒內86%計算出最佳解,180秒內93%計算出最佳解,計算出完成後實際將SC佈署於環境中提供使用者使用。
    Network Function Virtualization (NFV) as a new policy enforcement and service provisioning paradigm is considered as a framework for handling VNF placement and orchestration in the network. Each incoming request as a sequence of Network Functions (NFs), called Service Chain (SC), is processed and the environment is optimally prepared for satisfying the request. The SC provisioning has some operational costs. Creating VNF for each VNF request increases the number of VNFs in an unpleasant manner that leads to the higher resource wastage, environmental complexity and management costs. Because of the improper placement of the VNFs for each SC, the bandwidth usage cost affects the performance of the network. For decreasing the VNF numbers and bandwidth usage costs in the network, we propose Central Orchestration System (COS) which integrates the benefits of OpenStack in the presence of SDN technology. Our proposed method, according to the user request and the current situation of the network, calculates the optimum VNF locations and the connecting path of the VNFs in order to minimize the bandwidth and number of VNF costs. The first experiment confirms the computation time of our optimization model in a 48-ary Fat tree network environment. In the second experiment the COS had the better performance in comparison with the other methods.
    Appears in Collections:[通訊工程研究所] 學位論文

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