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arXiv 1806.04580cs.NI
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内容分发网络中增值业务的在线VNF放置和链接

Online VNF Placement and Chaining for Value-added Services in Content Delivery Networks

Narjes Tahghigh Jahromi, Somayeh Kianpisheh, Roch H. Glitho

摘要:

增值服务(VAS)(例如,动态站点加速、媒体管理)在内容分发网络(CDN)中起着关键作用。网络功能虚拟化(NFV)实现了VAS的敏捷配置。在NFV设置中,VAS被提供为虚拟网络功能(VNF)的有序集合,形成部署在CDN基础设施中的VNF转发图(VNF-FG)。CDN VAS VNF-FG具有特定的特性:它们具有一个端点(对应于内容服务器),该端点在它们的放置之前是未知的。到目前为止,CDN VAS VNF-FG放置的提案仅考虑了离线放置,其中VNF-FG在最终用户流量转向网络之前放置。然而,在具体情况下,可能发生服务使用模式的变化,这种情况可能需要以在线方式放置VNF-FG。本文解决了CDN中VAS的在线VNF-FG放置问题,考虑到已部署VNF的最终重用和迁移。考虑成本模型,包括多个成本;即,新的VNF实例化、迁移、托管和路由成本。目标是最佳地放置VNF-FG,使得在满足QoS的同时最小化总重新配置成本。一个非线性规划(ILP)制定和评估在一个小规模的情况下。

英文摘要:

Value-added Services (VASs) (e.g. dynamic site acceleration, media management) play a critical role in Content Delivery Networks (CDNs). Network Functions Virtualization (NFV) enables the agile provisioning of VASs. In NFV settings, VASs are provisioned as ordered sets of Virtual Network Functions (VNFs), forming VNF-Forwarding Graphs (VNF-FG) which are deployed in the CDN infrastructure. The CDN VAS VNF-FGs have a specific characteristic: they have one end-point (corresponding to the content server) that is unknown, prior to their placement. The proposals for CDN VAS VNF-FG placement, so far, have only considered offline placement, where the VNF-FGs are placed before end-user traffic steers into the network. However, in concrete cases, a change in service usage patterns might occur, a situation that could require a VNF-FG placement in an online manner. This paper tackles the problem of online VNF-FG placement for VASs in CDNs, taking into account the eventual reuses and migrations of already-deployed VNFs. A cost model is considered, including multiple costs; i.e. new VNF instantiations, migration, hosting and routing costs. The objective is to optimally place the VNF-FGs such that total reconfiguration costs are minimized while QoS is satisfied. An Integer Linear Programming (ILP) formulation is provided and evaluated in a small-scale scenario.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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