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??????IOS ??

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Title: PowerPoint Presentation Last modified by: Created Date: 1/1/1601 12:00:00 AM Document presentation format: Other titles – PowerPoint PPT presentation

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Title: ??????IOS ??


1
??????IOS ??
  • 1?????????????,?????????????
  • 2?????????,???????????
  • 3?????????????????,????PC ???,????CPU????BOOT
    ROM??
  • 4?????????????????????,?????NVRAM?FLASH
    ??????????

2
????6???????
  • (1) CPU??????,??????,??????????????
  • (2) RAM/DRAM??,???????????,?????ARP
    ?????????????????????????RAM ?????????????????
  • (3) FLASH????????ROM,????????IOS,FLASH
    ???????????????IOS ????????????????????,FLASH
    ????????FLASH ?????,???????IOS ???
  • (4) NVRAM????RAM,????????????,??????,NVRAM
    ?????????
  • (5) ROM?????,????????????????????????IOS
    ??(?????????),ROM ?????????????
  • (6) ??(Interface)??????,???????????????????????

3
IOS ??
  • ????????????,????IOS(Internetwork Operating
    System)?
  • ???????????IOS ????
  • Cisco ?IOS??????(??CLI,Command Line
    Interface),CLI ?????????
  • (1) ????(User mode)??????????????????,??????????,
    ????????????????
  • (2) ????(Privilege mode)??????????,??????????????
    ??

4
  • ?CLI ?????show??????????????????,???1?

5
?1 show????????????
6
????????
  • ???????????,????????NVRAM ?,????????????
  • ????,????TFTP ???????????????????????????????????,
    ???2 ???
  • ????IOS ?????,?????????TFTP ????IOS ????????
  • ?????????,???????????IOS,?????????,????TFTP???????
    IOS ??????????????????,????????

7
? 2 ???????
8
????????
  • Cisco ??????,????????????(Power On Self
    Test,POST),????CPU????????????,??????????????????3
    ,?????

9
  • (1) ??ROM ????????(Bootstrap Loader),???????BIOS
    ???,Bootstrap ??IOS ??RAM ?
  • (2) IOS ?????????(FLASH?TFTP ?????ROM ?),?????IOS
    ?????,?????????????????????????(configuration
    register)???16 ?(2 ??)????,?4 ??????,?????????????
    ?IOS,???1????IOS ???????4 ???
  • (3) ??IOS ?RAM ???IOS ?????,?????
  • (4) ?NVRAM ???????,?????????RAM ????
  • (5) ???NVRAM ?????????,???setup ????(?????????)?

10
  • ? 1 ???????????

???????(16 ??) ??
0 ??ROM ??
1 ???ROM ???
2-F ?FLASH ?TFTP ?????
11
?4? 2-4 ?????IOS ?????
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