第十一章建立串行的点对点连接VIP免费

©1999,CiscoSystems,Inc.12-1第十一章建立串行的点对点连接第十一章建立串行的点对点连接©1999,CiscoSystems,Inc.www.cisco.comICND—12-2通过本章的学习，您应该掌握以下内容：•在广域网的串行口上配置HDLC和PPP协议•在一个PPP连接内配置PAP和CHAP验证•查看点到点的HDLC和PPP协议配置情况本章目标©1999,CiscoSystems,Inc.www.cisco.comICND—12-3WAN概述WAN概述ServiceProvider•广域网连接的场所•根据用户不同的需求提供不同的连接方案©1999,CiscoSystems,Inc.www.cisco.comICND—12-4专线同步串口TelephoneCompany电路交换异步串口ServiceProvider包交换同步串口广域网连接类型:物理层广域网连接类型:物理层©1999,CiscoSystems,Inc.www.cisco.comICND—12-5Point-to-pointorcircuit-switchedconnectionCOSwitchCustomerPremisesEquipmentDemarcationLocalLoopWANserviceprovidertollnetworkTrunksandswitches广域网的服务提供服务商给用户分配线路的参数SSSSSSS©1999,CiscoSystems,Inc.www.cisco.comICND—12-6RouterconnectionsNetworkconnectionsattheCSU/DSUEIA/TIA-232EIA/TIA-449EIA-530V.35X.21CSU/DSUEnduserdeviceServiceProviderDTEDCEPPP的串口连接PPP的串口连接©1999,CiscoSystems,Inc.www.cisco.comICND—12-7专线包交换PPP,SLIP,HDLCHDLC,PPP,SLIP电路交换X.25,FrameRelay,ATM广域网连接类型:数据链路层广域网连接类型:数据链路层TelephoneCompanyServiceProvider©1999,CiscoSystems,Inc.www.cisco.comICND—12-8FlagAddressControlDataFCSFlagHDLC•支持单一的协议环境FlagAddressControlProprietaryDataFCSFlagCiscoHDLCHDLC帧格式•Cisco的HDLC具有proprietary字节提供对多协议环境的支持©1999,CiscoSystems,Inc.www.cisco.comICND—12-9HDLC命令Router(config-if)#encapsulationhdlc•启用HDLC封装•HDLC是同步串口的缺省封装格式©1999,CiscoSystems,Inc.www.cisco.comICND—12-10PPPEncapsulationTCP/IPNovellIPXAppleTalkMultipleprotocolencapsulationsusingNCPsinPPP•PPP可以通过NCP携带多个协议的数据包•PPP可以通过LCP建立和控制连接LinksetupandcontrolusingLCPinPPPPPP综述©1999,CiscoSystems,Inc.www.cisco.comICND—12-11SynchronousorAsynchronousPhysicalMediaLinkControlProtocolAuthentication,otheroptionsNetworkControlProtocolPPPDataLinkLayerPhysicalLayerNetworkLayerIPCPIPXCPManyOthersIPIPXLayer3ProtocolsPPP分层结构PPP—Adatalinkwithnetwork-layerservices©1999,CiscoSystems,Inc.www.cisco.comICND—12-12FeatureHowItOperatesProtocolAuthenticationPAPCHAPPerformChallengeHandshakeRequireapasswordCompressionCompressdataatsource;reproducedataatdestinationStackerorPredictorErrorDetectionAvoidframeloopingMonitordatadroppedonlinkMagicNumberMultilinkLoadbalancingacrossmultiplelinksMultilinkProtocol(MP)PPPLCP配置选项©1999,CiscoSystems,Inc.www.cisco.comICND—12-13PPP验证概述两种PPP验证协议:PAP和CHAPPPP会话的建立1链路建立2验证阶段3网路层协议连接DialuporCircuit-SwitchedNetwork©1999,CiscoSystems,Inc.www.cisco.comICND—12-14•密码明文传输•验证两端是同等的选择PPP验证协议RemoteRouter(SantaCruz)Central-SiteRouter(HQ)Hostname:santacruzPassword:boardwalkusernamesantacruzpasswordboardwalkPAP2-WayHandshake“santacruz,boardwalk”“santacruz,boardwalk”Accept/RejectAccept/Reject©1999,CiscoSystems,Inc.www.cisco.comICND—12-15选择PPP验证协议RemoteRouter(SantaCruz)Central-SiteRouter(HQ)Hostname:santacruzPassword:boardwalkusernamesantacruzpasswordboardwalkCHAP3-WayHandshakeChallengeChallengeResponseResponseAccept/RejectAccept/Reject密码是加密的©1999,CiscoSystems,Inc.www.cisco.comICND—12-16配置PPP验证总述ServiceProviderVerifywhoyouare.RoutertoBeAuthenticated(Therouterthatinitiatedthecall.)pppencapsulationhostnameus...