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1、NetworkEnvironmentManagementManagingRouterStartupandConfigurationRouterPower-OnBootSequencePerformpower-onself-test(POST).Loadandrunbootstrapcode.FindtheCiscoIOSSoftware.LoadtheCiscoIOSSoftware.Findtheconfiguration.Loadtheconfiguration.RuntheconfiguredCiscoIOSSoftware.RouterInternalComp
2、onentsROMFunctionsContainsmicrocodeforbasicfunctionsFindingtheCiscoIOSImageOrderofsearch:1.Checksconfigurationregister2.Parsesconfigurationforbootsystemcommand3.Defaultstofirstfileinflashmemory4.Attemptstobootfromnetworkserver5.Boothelperimage6.ROMMONLoadingtheCiscoIOSImagefromFlashMemo
3、ryTheflashmemoryfileisloadedintoRAM.LoadingtheConfigurationLoadandexecutetheconfigurationfromNVRAMIfnoconfigurationispresentinNVRAM,entersetupmodeDisplaysthecurrentandsavedconfigurationshowrunning-configandshowstartup-configCommandsDeterminingtheCurrentConfigurationRegisterValueCiscoIOS
4、Software,2800Software(C2800NM-IPBASE-M),Version12.4(5a),RELEASESOFTWARE(fc3)TechnicalSupport:http://www.cisco.com/techsupportCopyright(c)1986-2006byCiscoSystems,Inc.CompiledSat14-Jan-0603:19byalnguyenROM:SystemBootstrap,Version12.4(1r)[hqluong1r],RELEASESOFTWARE(fc1)RouterXuptimeis1week
5、,5days,21hours,30minutesSystemreturnedtoROMbyreloadat23:04:40UTCTueMar132007Systemimagefileis"flash:c2800nm-ipbase-mz.124-5a.bin"Cisco2811(revision53.51)with251904K/10240Kbytesofmemory.ProcessorboardIDFTX1013A1DJ2FastEthernetinterfaces2Serial(sync/async)interfacesDRAMconfigurationis64bi
6、tswidewithparityenabled.239Kbytesofnon-volatileconfigurationmemory.62720KbytesofATACompactFlash(Read/Write)Configurationregisteris0x2102ConfigurationRegisterValuesConfigurationregisterbits3,2,1,and0setbootoptionChecktheconfigurationregistervaluewiththeshowversioncommandshowversionComman
7、dCiscoIOSSoftware,2800Software(C2800NM-IPBASE-M),Version12.4(5a),RELEASESOFTWARE(fc3)TechnicalSupport:http://www.cisco.com/techsupportCopyright(c)1986-2006byCiscoSystems,Inc.CompiledSat14-Jan-0603:19byalnguyenROM:SystemBootstrap,Version12.4(1r)[hqluong1r],RELEASESOFTWARE(fc1)Ro
