Cisco发现协议

©2006,ShenzhenPolytechnic.Allrightsreserved.1Cisco发现协议CiscoDiscoveryProtocol深圳职业技术学院计算机系网络专业©2006,ShenzhenPolytechnic.Allrightsreserved..2教学目标（Objectives）1.Cisco发现协议特征（FeatureofCiscoDiscoveryProtocol）2.CDP命令（CDPCommand）3.开启和关闭CDP（EnableanddisableCDP）4.远程登录（telnet）©2006,ShenzhenPolytechnic.Allrightsreserved..3Cisco发现协议（CiscoDiscoveryProtocol）1.Cisco提供的专有的命令CDPrunsonallCiscoequipment2.获得直接连接的设备的信息摘要TheprimaryuseofCDPistodiscoverallCiscodevicesthataredirectlyconnectedtoalocaldevice.3.运行在数据链路层CiscoDiscoveryProtocol(CDP)isaLayer2protocol4.Cdp版本1在10.3版本后会自动启动CDPVersion1isenabledbydefaultwithCiscoIOS(Release10.3later).5.cdp更新周期60秒CDPupdatetimeris60s6.cdp过期周期180秒CDPholdtimeris180s©2006,ShenzhenPolytechnic.Allrightsreserved..4信息摘要包括（Summaryinformationincludes）:•设备ID（DeviceID）•本地接口（LocalInterface）•保持时间（Holdtime）•功能（Capability）•平台（Platform）•端口ID（PortID）•VTP域名（VTPManagementDomainName(CDPv2only)）•本征VLAN（NativeVLAN(CDPv2only)）•全双工/半双工（Full/Half-Duplex(CDPv2only)）CDPshowcdpCDPCDP用CDP发现邻居（DiscoveringNeighborswithCDP）©2006,ShenzhenPolytechnic.Allrightsreserved..5UsingtheshowcdpneighborCommandRouterA#shcdpneighborsCapabilityCodes:R-Router,T-TransBridge,B-SourceRouteBridgeS-Switch,H-Host,I-IGMP,r-RepeaterDeviceIDLocalIntrfceHoldtmeCapabilityPlatformPortIDRouterBSer0148R2522Ser1SwitchAEth0167TS19002SwitchBRouterARouterBSwitchA10.3.3.210.3.3.110.1.1.110.1.1.210.2.2.110.2.2.2S0S1©2006,ShenzhenPolytechnic.Allrightsreserved..6UsingtheshowcdpentryCommandRouterA#shcdpentry*-------------------------DeviceID:RouterBEntryaddress(es):IPaddress:10.1.1.2Platform:cisco2522,Capabilities:RouterInterface:Serial0,PortID(outgoingport):Serial1Holdtime:168secVersion:CiscoInternetworkOperatingSystemSoftwareIOS(tm)2500Software(C2500-JS-L),Version12.0(3),RELEASESOFTWARE(fci)Copyright(c)1986-1999byciscoSystems,Inc.CompiledMon08-Feb-9918:18byphanguyeSwitchBRouterARouterBSwitchA10.3.3.210.3.3.110.1.1.110.1.1.210.2.2.110.2.2.2S0S1©2006,ShenzhenPolytechnic.Allrightsreserved..7CDP其它命令（AdditionalCDPCommands）RouterA#shcdptrafficCDPcounters:Packetsoutput:56,Input:38Hdrsyntax:0,Chksumerror:0,Encapsfailed:3Nomemory:0,Invalidpacket:0,Fragmented:0RouterA#shcdpinterfaceBRI0isadministrativelydown,lineprotocolisdownEncapsulationHDLCSendingCDPpacketsevery60secondsHoldtimeis180secondsSwitchBRouterARouterBSwitchA10.3.3.210.3.3.110.1.1.110.1.1.210.2.2.110.2.2.2S0S1©2006,ShenzhenPolytechnic.Allrightsreserved..8•1.在全局配置模式下使用（no）cdprun命令开启或关闭所由接口的CDP功能。默认情况下，CDP被全局开启。•ThecdpruncommandisusedtoenableCDPgloballyontherouter.Bydefault,CDPisgloballyenabled.•2.在接口模式下使用（no）cdpenable命令可以开启或关闭某个特定接口的CDP功能。•CDPcouldbeenabledoneachofthedevicesinterfacesbyusingthecdpenablecommand.开启和关闭CDP（EnableanddisableCDP）©2006,ShenzhenPolytechnic.Allrightsreserved..9配置周期（ConfiguringTimer）Router(config)#cdptimer5Router(config)#cdpholdtime15©2006,ShenzhenPolytechnic.Allrightsreserved..10用telnet连接到远程主机（UsingTelnettoConnecttoRemoteDevices）RemotedeviceSwitchBRouterARouterBSwitchA10.3.3.210.3.3.110.1.1.110.1.1.210.2.2.110.2.2.2S0S1RouterA#telnet10.1.1.2Trying10.1.1.2...Open-------------------------------------------------Catalyst1900ManagementConsoleCopyright(c)CiscoSystems,Inc.1993-1998Allrightsreserved.EnterpriseEditionSoftwareEthernetAddress:00-90-86-73-33-40PCANumber:73-2239-06PCASerialNumber:FAA02359H8KModelNumber:WS-C1924-ENSystemSerialNumber:FAA0237X0FQ..RouterB©2006,ShenzhenPolytechnic.Allrightsreserved..11查看telnet连接（ViewingTelnetConnections）SwitchBRouterARouterBSwitchA10.3.3.210.3.3.110.1.1.110.1.1.210.2.2.110.2.2.2S0S1RouterA#shsessionConnHostAddressByteIdleConnName110.1.1.210.1.1.20110.1.1.2*210.3.3.210.3.3.20010.3.3.2RouterA#shuserLineUserHost(s)IdleLocation*0con010.1.1.2310.3.3.2211vty0idle110.1.1.2©2006,ShenzhenPolytechnic.Allrightsreserved..12挂起telnet会话（SuspendingaTelnetSession）SwitchBRouterARouterBSwitchA10.3.3.210.3.3.110.1.1.110.1.1.210.2.2.110.2.2.2S0S1RouterB#Ctrl-Shift-6xRouterA#shsessionConnHostAddressByteIdleConnName110.1.1.210.1.1.20110.1.1.2RouterA#resume1RouterB#©2006,ShenzhenPolytechnic.Allrightsreserved..13RouterA#disconnectClosingconnectionto10.3.3.2[confirm]RouterA#clearline11[confirm][OK]关闭telnet会话（ClosingaTelnetSession）ClosingasessionopenedbyaremotedeviceClosingthecurrentsessionopenedbyyouSwitchBRouterARouterBSwitchA10.3.3.210.3.3.110.1.1.110.1.1.210.2.2.110.2.2.2S0S1©2006,ShenzhenPolytechnic.Allrightsreserved..14思考题（Questions）1．CDP有哪些特征？2．CDP的功能是什么？3．用CDP可以看到邻居的哪些信息？4．用什么命令可以在接口下控制CDP的启动？5．哪个符号是我们获得帮助时最常用的？6．telnet默认支持几个用户同时登录？