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1、11ConfiguringAdvancedRoutingProtocolsCERTIFICATIONOBJECTIVES11.1OSPF1CharacteristicsofOSPF1ConfiguringOSPF8LoopbackTnterfaces10TroubleshootingOSPF1211.2ElGRP20CharacteristicsofEIGRP20ConfiguringEIGRP23TroubleshootingEIGRP24CERTIFICATIONSUMMARY28TWO-MINUTEDRILL29SELFTEST30SELFTESTANSWERS32I
2、nChapter10,youwereintroducedtotheconfigurationoftwodistaneevectorroutingprotocols:IPRIPandIGRP・Thischapterfocusesontwoadvancedroutingprotocols:OSPFandEIGRP.OSPFisalinkstateprotocol,andEIGRPisahybridprotocoLThischaptercoversonlybasicoperationandconfigurationoftheseprotocols.Amorethoroughdis
3、cussioniscoveredinCisco'sBSCICCNPandCCDPexam.11.1OSPFTheOpenShortestPathFirst(OSPF)protocolisalinkstateprotocolthathandlesroutingforTPtraffic.Itsnewestimplementation,version2,whichisexplainedinRFC2328,isanopenstandard,likeRTP.Chapter9offeredabriefintroductiontolinkstateprotocols.Asyouwills
4、eeinthissection,OSPFdrawsheavilyontheconceptsdescribedinthatchapter,butitalsohassomefeaturesofitsown.BesidescoveringthecharacteristicsofOSPF,you11bepresentedwithenoughinformationtoundertakeaverybasicroutingconfigurationusingOSPF.CharacteristicsofOSPFOSPFwascreatedinthemid-1980sinordertoove
5、rcomemanyofthedeficienciesandscalabilityproblemsthatRIPhadinlargeenterprisenet.works・Becauseitisbasedcmanopenstandard,OSPFisverypopularinmanycorporatenetworkstodayandhasmanyadvantages,ineludingthese:■Itwillrunonmostrouters,sinceitisbasedonanopenstandard.■ItusestheSPFalgorithm,developedbyDi
6、jkstm,toprovidealoop-freet.opology・■Itprovidesfastconvergeneewithtriggered,incrementalupdatesviaLinkStateAdvertisements(LSAs).■ItisaclasslessprotocolandallowsforahierarchicaldesignwithVLSMandroutesummarization.Givenitsadvanlagcs,OSPFdoeshaveitsshareofdisadvantages:■Itrequiresmorememorytoho
7、idtheadjacency(listofOSPFneighbors),topology(alinkstatedatabasecontainingalloftheroutersandtheirroutes),androutingtables.■It.requiresextraCPUprocessingtoruntheSPFalgorithm,whichisespeciallytruewhenyoufirstturnonyourroutersandtheyareinitiallybuildingtheadjacenc
