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SLA----服务等级协议ISP的锐利武器和必由之路内容提要一、什么是SLA?SLA的分类SLA的特点SLAConfigurationWebGoldReportforAcme.com28SLAcalculationswereperformedovertheperiodOct1199912:00:00AM-Oct7199911:59:59PM.16werefoundcompliant9werefoundnon-compliantand3wereundetermined.测量实际服务性能参数-Measureandrecordactualservicetransactiontimes-Measurefullpathsspanningnetworkandservers-Betterreflectscustomeroruserexperience监视服务等级协议的符合情况-Monitoringandmanagementofthekeycomponentsthatprovidetheactualservices-ProvidesanaccurateviewofactualservicequalitydeliveredasviewedbythecustomerSLA报警和快速定位问题-Providespreemptivewarningofdevelopingserviceproblems-Enablesrapidfaultidentificationandisolation提供SLA报告-Performancegraphsenabletrendanalysisfortrackingassetutilizationfuturecapacityplanningreal-timeservicesummaries-CustomerreportingconfirmsQoS为什么SLA变得越来越重要Manageeverchangingtechnologies二、国内外SLA技术的发展动态目前世界上最大的Internet骨干网络提供商基本上都为客户提供了实时/准实时的SLA并在WEB上公开发布骨干网络的SLA报告。AT&TSprintUUNETQwestCable&Wireless越来越多的数据中心采用SLA技术提高市场竞争力和争取客户。例如世界上最大的Hosting公司Verio等第三方独立的SLA测量和报告服务公司涌现KeynoteMIDSAT&TSLAGlossaryBackboneAvailabilityThisistheoverallavailabilityofthenetworkaveragedoverthemonth.BackboneDelayDelay(orlatency)istheround-triptimeforasmalldatapackettotravelbetweentwoendpoints(sourceanddestinationcity-pairs)inthenetworkbackbone.Delayaffectsone'sperceptionoftheresponsetimeofthenetwork.BackboneLossLossisthepercentageofpacketslostinadatatransaction.Themeasurementisaroundtriponemadebycountingthepacketssentbetweentwocity-pairsthatdonotreturn.Distance-SensitiveThresholdsBecausethedelayacrossthenetworkisdependentonthedistancethepacketshavetotravelourthresholdsaresettobedistancesensitive(basedonthespeedoflightinfiber).Thedistances