2使用CDP和Telnet管理網(wǎng)絡

基本實驗拓撲:/24首先在R1是檢查到R2R3的鏈路是否連通R1#pingTypeescapesequencetoabort.Sending5,100-byteICMPEchosto,timeoutis2seconds:!!!!! //5個!表明網(wǎng)絡是通的Successrateis100percent(5/5),round-tripmin/avg/max=4/4/8msR1#pingTypeescapesequencetoabort.Sending5,100-byteICMPEchosto,timeoutis2seconds:!!!!!//5個!表明網(wǎng)絡是通的Successrateis100percent(5/5),round-tripmin/avg/max=4/4/8msR1#1.學習CDP(CISCO發(fā)現(xiàn)協(xié)議)(CISCO專用協(xié)議)R1#showcdp? 〃查看CDP命令的參數(shù)entryInformationforspecificneighborentryinterfaceCDPinterfacestatusandconfigurationneighborsCDPneighborentriestrafficCDPstatisticsI Outputmodifiers<cr>R1#showcdpneighbors〃查看CDP的鄰居CapabilityCodes:R-Router,T-TransBridge,B-SourceRouteBridgeS-Switch,H-Host,I-IGMP,r-RepeaterDeviceIDLocalIntrfceHoldtmeCapabilityPlatformPortIDswWS-C2950-2Fas0/23Eth0 150swWS-C2950-2Fas0/23R2 Ser0 133 R 2500 Ser0R3 Ser1 140 R 2500 Ser0R1#showcdpinterface//在路由器上查看運行CDP的接口Ethernet0isup,lineprotocolisup//E0口運行CDPEncapsulationARPASendingCDPpacketsevery60secondsHoldtimeis180secondsSerial0isup,lineprotocolisup//S0口運行CDPEncapsulationHDLCSendingCDPpacketsevery60secondsHoldtimeis180secondsSerial1isup,lineprotocolisup//S1口運行CDPEncapsulationHDLCSendingCDPpacketsevery60secondsHoldtimeis180secondsR1#showcdptraffic〃查看CDP的packetsCDPcounters:Totalpacketsoutput:222,Input:223Hdrsyntax:0,Chksumerror:0,Encapsfailed:0Nomemory:0,Invalidpacket:0,Fragmented:0CDPversion1advertisementsoutput:0,Input:0CDPversion2advertisementsoutput:222,Input:223R1#showcdpentry* 〃查看CDP鄰居的所有詳細內(nèi)容DeviceID:swEntryaddress(es):IPaddress:25Platform:ciscoWS-C2950-24,Capabilities:SwitchIGMPInterface:Ethernet0,PortID(outgoingport):FastEthernet0/23Holdtime:178secVersion:CiscoInternetworkOperatingSystemSoftwareIOS(tm)C2950Software(C2950-I6Q4L2-M),Version12.1(22)EA2,RELEASESOFTWARE(fc1)Copyright(c)1986-2004byciscoSystems,Inc.CompiledSun07-Nov-0423:14byantoninoadvertisementversion:2ProtocolHello: OUI=0x00000C,ProtocolID=0x0112;payloadlen=27,value=00000000FFFFFFFF010221FF00000000000000131A9A2B80FF00VTPManagementDomain:'wisdom'NativeVLAN:1Duplex:halfDeviceID:R2Entryaddress(es):IPaddress:Platform:cisco2500,Capabilities:RouterInterface:Serial0,PortID(outgoingport):Serial0Holdtime:160secVersion:CiscoInternetworkOperatingSystemSoftwareIOS(tm)2500Software(C2500-JS56I-L),Version12.1(5)T12,RELEASESOFTWARE(fc1)TACSupport:/tacCopyright(c)1986-2002byciscoSystems,Inc.CompiledMon04-Feb-0211:25byccaiadvertisementversion:2DeviceID:R3Entryaddress(es):IPaddress:Platform:cisco2500,Capabilities:RouterInterface:Serial1,PortID(outgoingport):Serial0Holdtime:167secVersion:CiscoInternetworkOperatingSystemSoftwareIOS(tm)2500Software(C2500-JK8OS-L),Version12.2(1d),RELEASESOFTWARE(fc1)Copyright(c)1986-2002byciscoSystems,Inc.CompiledSun03-Feb-0222:01bysraniadvertisementversion:2R1#R1#configtEnterconfigurationcommands,oneperline.EndwithCNTL/Z.R1(config)#nocdprun//在路由器上關(guān)閉CDP協(xié)議R1(config)#endR1#show01:44:40:%SYS-5-CONFIG_I:ConfiguredfromconsolebyconsoleR1#showcdpinterface%CDPisnotenabled〃關(guān)閉了CDP協(xié)議后用showcdpinterface檢查路由器已把CDP關(guān)閉R1#2.2.利用TELNET來管理網(wǎng)絡/24實驗目的:首先通CONSOLE口控制R1,控制R1后通過TELNET到R2,R3,對R2,R3進行管理.在R1上實驗：R1#telnet//從R1TELNET至UR2Trying...OpenUserAccessVerificationPassword:R2>按<。trl-Shift-6>x切換回R1R1#telnet//從R1TELNET至UR3Trying...OpenUserAccessVerificationPassword:R3>

按<。trl-Shift-6>x切換回R1R1#showsessions//在R1上查看打開了多少個TELNET的會話ConnHostAddressByteIdleConnName100*200R1#resume2〃重新連接到R3[Resumingconnection2to...]R3>按<。trl-Shift-6>x切換回R1R1#R1#showsessionConnHostAddressByteIdleConnName1610*200R1#disconnect1//從R1是主動斷開到R2的連接(斷開一個TELNET的會話)Closingconnectionto[confirm]在R2上實驗：R2#showusers//在R2上查看有誰登錄到路由器LineUserHost(s) IdleLocation*0con0 idle 00:00:002vty0 idle 00:01:52InterfaceUserModeIdlePeerAddressR2#clearline2〃發(fā)現(xiàn)有人TELNET過來，把他清除[confirm][OK]R2#showusersIn