文档介绍：第六章 :#shcdp?DPstatistics<cr>RouterA(config)#nocdprunRouterA(config)#interfaceserial0RouterA(config-if)#nocdpenable交换机A同时也显示其Mac地址使用showcdpneighbor命令RouterA#shcdpneighborsCapabilityCodes:R-Router,T-TransBridge,B-SourceRouteBridgeS-Switch,H-Host,I-IGMP,r-##,100-,timeoutis2seconds:!!!!!essrateis100percent(5/5),round-tripmin/avg/max=4/4/4msRouter##路由器加电/启动顺序加电自检(POST)加载并运行启动引导微代码寻找IOS映象文件加载IOS映象文件寻找配置文件加载配置文件正常运行路由器内部组件RAM配置寄存器ROMFlashNVRAM端口ROM功能ROM存放完成基本功能的微代码BootstrapMiniIOSROM monitorPOSTshowversion控制台确认当前的配置寄存器值wg_ro_a#workOperatingSystemSoftwareIOS(tm)2500Software(C2500-JS-L),(3),RELEASESOFTWARE(fc1)Copyright(c)1986-1999byciscoSystems,piledMon08-Feb-9918:18byphanguyeImagetext-base:0x03050C84,data-base:0x00001000ROM:SystemBootstrap,(10c),SOFTWAREBOOTFLASH:3000BootstrapSoftware(IGS-BOOT-R),(10c),RELEASESOFTWARE(fc1)wg_ro_auptimeis20minutesSystemrestartedbyreloadSystemimagefileis"flash:c2500-js-l_120-"--More--Configurationregisteris0x2102用命令showversion所显示的配置寄存器值设定配置寄存器的值配置寄存器的3,2,1和0位是启动选项位Router#configureterminalRouter(config)#config-register0x2102[Ctrl-Z]Router#reload