思科网络技术学院教程7.pdf

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1、CHAPTER7DistanceVectorRoutingProtocolsAdditionalTopicsofInterestIGRPFeatures.................................................................................................................................1IGRPMetricComponents.................................................................

2、............................................2IGRPRoutes...................................................................................................................................4IGRPLoop-AvoidanceFeatures..............................................................................

3、......................5ConfiguringIGRP...........................................................................................................................6MigratingfromRIPtoIGRP..........................................................................................................7

4、IGRPVerificationandTroubleshooting.......................................................................................8Inthebook,Chapter7,“DistanceVectorRoutingProtocols,”coversawidevarietyofconceptsabouthowdis-tancevectorroutingprotocolsworkandhowtheyavoidroutingloops.Italsocoversmanyde

5、tailsaboutRIPconfiguration.This“AdditionalTopicsofInterest”sectionforChapter7coverstheCisco-proprietaryInteriorGatewayRoutingProtocol(IGRP),focusingontheconfigurationdetails,becausemanyoftheconceptswerealreadycoveredinChapter7.LikeRIP,IGRPisadistancevectorroutingprotocol.UnlikeRIP,IGRPisaCi

6、sco-proprietaryprotocolratherthanastandards-basedprotocol.Althoughsimpletoimplement,IGRPisamorecomplexroutingprotocolthanRIP.IGRPusesanumberoffactorstodeterminethebestroutetoadestinationnetwork.IGRPFeaturesIGRPhasmanysimilaritiestoRIP,becausebotharedistancevectorprotocols.Bothsendperiodicfu

7、llupdatesatregularintervals.Bothallowrouterstolearnaboutallroutesandchoosethebestroutebasedonthelowestmetric.Bothusethesameloop-avoidancefeatures,suchassplithorizon,routepoisoning,triggeredupdates,andholddown.IGRPdiffersfromRIPinseveralwaysaswell:nCisco-