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ID:47853009
大小:52.50 KB
页数:14页
时间:2019-11-28
《STP协议原理及配置(STPprotocolprincipleandconfiguration)》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、STP协议原理及配置(STPprotocolprincipleandconfiguration)STPprotocolprincipleandconfigurationI.overviewofSTPSTP(spanningtreeprotocol)isatwolayermanagementprotocol.AmongalltheswitchesinSTPinanextendedLANthroughexchangeBPDUbridgeprotocoldataunit(bridgeprotocoldataunit)torealizethestable;spanningtreetopologysel
2、ectionarootbridge:segmentchooseaspecifiedswitchforeachexchange;willredundentpathsswitchsettoblockingtoeliminatetheloopinthenetwork・IEEE802.IdistheearlieststandardaboutSTP,itprovidesthedynamicredundancyswitchingmechanismofthenetwork・STPenablesyoutodeploybackuplinesinnetworkdesignandensurethat:*whenth
3、emainlineisfunctioningproperly,thebackuplineisclosed.*whenthemainlinefails,automaticallyenablesthebackuplineandswitchesthedatastream・Relationshipbetween1VLANandspanningtreeIEEEgeneralspanningtree(CST)>CISCOPERVLANspanningtree(PVST)"CISCOPERVLANCST(PVSTspanningtree)CSTistheIEEEsolutionforrunningvirtu
4、alLANVLANspanningtrees・CSTdefinestheentiresecondlayerswitchingnetwork,allimplementedVLAN,usingonlyonespanningtreeinstance・Thisspanningtreeinstancerunsontheentireswitchedlan・PVSTisaCISCOspecificsolutionforprocessingspanningtreesovervirtualIans・PVSTrunsaseparatespanningtreeinstanceforeachvirtuallan.Ty
5、pically,PVSTrequiresrunningCISCOISL.ontherelaylinkbetweenswitchesPVSTisCISCOtosolveanothersolutionspanningtreeprobleminvirtualLAN.PVSTallowstheCSTmessagetoPVST,andothermanufacturerstoachievemethodofrunningthespanningtreeontheVLANoperation.2presstheVLANspanningtree(PVST)Createaseparatespanningtreeins
6、tance(PVST)foreachVLAN・Spanningtreealgorithmisusedtocomputethebestacyclicpathofthewholeswitchingnetwork・AdvantagesofPVST:Theoverallsizeofthespanningtreetopologyisreduced・Itimprovestheextensibilityofthespanningtreeandreducestheconvergencetime・>providesfasterconvergence,recoverycapability,andhigherrel
7、iability.DisadvantagesofPVST:>>inordertomaintainthespanningtreegeneratedforeachVLAN,theutilizationoftheswitchwillbehigher>tosupporttheVLANofeachBPDU,moreTRUNKlinkbandwidthisrequiredThespanningtreecano
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