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1、BGP技術(shù)：路由反射器Ender.joe(周亞軍)RSCCIE,SPCCIE,思科認證講師#34708RS&SPCCIE講師，Yeslab（上海）?2010Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential1IntroducingRouteReflectorsScalingServiceProviderNetworksBGPv3.2—6-2EnderOverviewIBGPScalabilityIssuesinaTransitAS-RR在一個大型傳
2、輸網(wǎng)絡(luò)的作用RouteReflectorSplit-HorizonRules-RR的水平分割原則RedundantRouteReflectors-冗余的RRRouteReflectorClusters-RR簇AdditionalRouteReflectorLoop-PreventionMechanisms-RR的防環(huán)機制Summary?2012Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential3?IBGPrequiresafullmeshbetwe
3、enallBGP-speakingrouters.LargenumberofTCPsessionsUnnecessaryduplicateroutingtraffic?SolutionsRoutereflectorsmodifyIBGPsplit-horizonrules（RR修改了IBGP的水平分割原則）BGPconfederationsmodifyIBGPAS-pathprocessing（BGP聯(lián)邦修改了IBGP的AS-path）?2012Ciscoand/oritsaffiliates.Allrightsre
4、served.CiscoConfidential4ClassicIBGP:IBGProutesarenotpropagatedtootherRoutereflectorcanpropagateIBGProutestootherIBGPpeers.IBGPpeers（RR通告IBGP路由給其他IBGPpeer）FullmeshofIBGPpeersisthereforerequired.FullmeshofIBGPpeersisnolongerrequired（全互聯(lián)不再需要）?2012Ciscoand/oritsaf
5、filiates.Allrightsreserved.CiscoConfidential52、從一個RR的客戶端收到的路由通告給其他所有鄰居（包括客戶端和非客戶端）1、從EBGP收到的通告給所有的內(nèi)部鄰居?2012Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential64、所有IBGP和EBGP路由發(fā)送給EBGP鄰居3、從一個非客戶端的IBGP鄰居收到的路由會發(fā)送給客戶端和EBGP鄰居?2012Ciscoand/oritsaffiliates.Allr
6、ightsreserved.CiscoConfidential7RR必須設(shè)計成為冗余的，否則會成為單點故障點?2012Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential8冗余的RR解決了高可用性問題Originator-ID是在AS邊界得到路由時的一個標識（當(dāng)路由經(jīng)過R1-R3R2-R3傳遞回來時拒收）Cluster-ID，當(dāng)R2和R3的cluster-ID相同時，R3不再接收R2反射來的路由R2R1簇的概念用于在RR之間阻止環(huán)路?2012Cisc
7、oand/oritsaffiliates.Allrightsreserved.CiscoConfidential9Agroupofredundantroutereflectorsandtheirclientsformacluster-冗余的RR和他們的客戶端形成一個簇Eachclustermusthaveauniquecluster-ID-每個簇有一個單獨的cluster-IDEachtimearouteisreflected,thecluster-IDisaddedtothecluster-listBGPattri
8、bute-當(dāng)路由被反射時，會在BGP的cluster-list屬性中增加cluster-IDTheroutethatalreadycontainsthelocalcluster-IDinthecluster-listisnotreflected-收到的路由已經(jīng)包含了本身的cluster-ID將不會接收?2012Ciscoand/oritsaff
