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1、ConfiguringBGPThischapterdescribeshowtoconfigureBorderGatewayProtocol(BGP).ForacompletedescriptionoftheBGPcommandsinthischapter,refertothe“BGPCommands”chapteroftheCiscoIOSIPCommandReference,Volume2of3:RoutingProtocols.Tolocatedocumentationofothercommandsthatappearinthischapt
2、er,usethecommandreferencemasterindex,orsearchonline.FormultiprotocolBGPconfigurationinformationandexamples,refertothe“ConfiguringMultiprotocolBGPExtensionsforIPMulticast”chapteroftheCiscoIOSIPConfigurationGuide.FormultiprotocolBGPcommanddescriptions,refertothe“MultiprotocolB
3、GPExtensionsforIPMulticastCommands”chapteroftheCiscoIOSIPCommandReference.BGP,asdefinedinRFCs1163and1267,isanExteriorGatewayProtocol(EGP).Itallowsyoutosetupaninterdomainroutingsystemthatautomaticallyguaranteestheloop-freeexchangeofroutinginformationbetweenautonomoussystems.F
4、orprotocol-independentfeatures,seethechapter“ConfiguringIPRoutingProtocol-IndependentFeatures”inthisbook.Toidentifythehardwareplatformorsoftwareimageinformationassociatedwithafeature,usetheFeatureNavigatoronCisco.comtosearchforinformationaboutthefeatureorrefertothesoftwarere
5、leasenotesforaspecificrelease.Formoreinformation,seethe“IdentifyingSupportedPlatforms”sectioninthe“UsingCiscoIOSSoftware”chapterinthisbook.TheCiscoBGPImplementationInBGP,eachrouteconsistsofanetworknumber,alistofautonomoussystemsthatinformationhaspassedthrough(calledtheautono
6、moussystempath),andalistofotherpathattributes.WesupportBGPVersions2,3,and4,asdefinedinRFCs1163,1267,and1771,respectively.TheprimaryfunctionofaBGPsystemistoexchangenetworkreachabilityinformationwithotherBGPsystems,includinginformationaboutthelistofautonomoussystempaths.Thisin
7、formationcanbeusedtoconstructagraphofautonomoussystemconnectivityfromwhichroutingloopscanbeprunedandwithwhichautonomoussystem-levelpolicydecisionscanbeenforced.YoucanconfigurethevaluefortheMultiExitDiscriminator(MED)metricattributeusingroutemaps.(ThenameofthismetricforBGPVer
8、sions2and3isINTER_AS_METRIC.)WhenanupdateissenttoaninternalBGP(iBGP)peer,th
