7BGP-route-reflector(路由反射器规则及配置实例)

《7BGP-route-reflector(路由反射器规则及配置实例)》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、BGP技术：路由反射器Ender.joe(周亚军)RSCCIE,SPCCIE,思科认证讲师#34708RS&SPCCIE讲师，Yeslab（上海）©2010Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential1IntroducingRouteReflectorsScalingServiceProviderNetworksBGPv3.2—6-2EnderOverviewIBGPScalabilityIssuesinaTransitAS-RR在一个大型传

2、输网络的作用RouteReflectorSplit-HorizonRules-RR的水平分割原则RedundantRouteReflectors-冗余的RRRouteReflectorClusters-RR簇AdditionalRouteReflectorLoop-PreventionMechanisms-RR的防环机制Summary©2012Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential3•IBGPrequiresafullmeshbetwe

3、enallBGP-speakingrouters.LargenumberofTCPsessionsUnnecessaryduplicateroutingtraffic•SolutionsRoutereflectorsmodifyIBGPsplit-horizonrules（RR修改了IBGP的水平分割原则）BGPconfederationsmodifyIBGPAS-pathprocessing（BGP联邦修改了IBGP的AS-path）©2012Ciscoand/oritsaffiliates.Allrightsre

4、served.CiscoConfidential4ClassicIBGP:IBGProutesarenotpropagatedtootherRoutereflectorcanpropagateIBGProutestootherIBGPpeers.IBGPpeers（RR通告IBGP路由给其他IBGPpeer）FullmeshofIBGPpeersisthereforerequired.FullmeshofIBGPpeersisnolongerrequired（全互联不再需要）©2012Ciscoand/oritsaf

5、filiates.Allrightsreserved.CiscoConfidential52、从一个RR的客户端收到的路由通告给其他所有邻居（包括客户端和非客户端）1、从EBGP收到的通告给所有的内部邻居©2012Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential64、所有IBGP和EBGP路由发送给EBGP邻居3、从一个非客户端的IBGP邻居收到的路由会发送给客户端和EBGP邻居©2012Ciscoand/oritsaffiliates.Allr

6、ightsreserved.CiscoConfidential7RR必须设计成为冗余的，否则会成为单点故障点©2012Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential8冗余的RR解决了高可用性问题Originator-ID是在AS边界得到路由时的一个标识（当路由经过R1-R3R2-R3传递回来时拒收）Cluster-ID，当R2和R3的cluster-ID相同时，R3不再接收R2反射来的路由R2R1簇的概念用于在RR之间阻止环路©2012Cisc

7、oand/oritsaffiliates.Allrightsreserved.CiscoConfidential9Agroupofredundantroutereflectorsandtheirclientsformacluster-冗余的RR和他们的客户端形成一个簇Eachclustermusthaveauniquecluster-ID-每个簇有一个单独的cluster-IDEachtimearouteisreflected,thecluster-IDisaddedtothecluster-listBGPattri

8、bute-当路由被反射时，会在BGP的cluster-list属性中增加cluster-IDTheroutethatalreadycontainsthelocalcluster-IDinthecluster-listisnotreflected-收到的路由已经包含了本身的cluster-ID将不会接收©2012Ciscoand/oritsaff