文档介绍：IOS映像和密码恢复 IOS Image and Password Recovery
深圳职业技术学院计算机系网络专业
教学目标( Objectives )
(Router Startup Sequence )
(Router Load IOS Sequence )
(Configuring Router Configuration Register )
(Router Password Recovery)
5. IOS和配置文件备份
(Backup IOS and Configuration File)
6. IOS的恢复或升级
( Recovery or Upgrade IOS )
Cisco IOS
work Operating
System
Software
互联网操作系统
Cisco
IOS
启动顺序预览(An Overview of System Startup)
上电自检(Power on self test (POST))
装载引导程序(Load and run bootstrap code)
查找IOS(Find the IOS software)
装载IOS( Load the IOS software)
查找配置文件(Find the configuration)
装载配置文件(Load the configuration)
运行(Run)
启动顺序( Startup Sequence )
RAM
ROM
Bootstrap
装载启动程序Load Bootstrap
TFTP Server
Flash
ROM
Cisco
work
Operating
System
装载IOS
Locate and Load
Operating System
Console
TFTP Server
NVRAM
Configuration
File
装载配置文件或
进入Setup模式
Locate and Load
Configuration File or
Enter Setup Mode
加载 IOS顺序( Load IOS Sequence )
show
version
show
startup-config
Console
Config register
配置寄存器
NVRAM
,boot system命令指定了查找顺序,路由器会依次使用
Global configuration mode boot mands can be specified to enter fallback sources for the router to use in sequence. The router will use mands as needed, in sequence, when it restarts.
,路由器会使用自己的Flash中的IOS软件
If NVRAM lacks boot mands that the router can use, the system by default uses the Cisco IOS software in flash memory.
定位IOS( Locating the Cisco IOS Software)
配置寄存器( Configuration Registers )
更改NVRAM中的寄存器,会改变Cisco IOS软件的基本选项,可以指定从哪里引导IOS
Router# configure terminal
Router(config)# boot system flash IOS_filename
Router(config)# boot system tftp IOS_filename tftp_address
Router(config)# boot system rom
[Ctrl-Z]
Router# copy running-config startup-config
Boot mands not found In NVRAM
Get default Cisco IOS software from Flash
Flash memory empty
Get default Cisco IOS software from TFTP server
From ROM
ROM功能( ROM Functions )
ROM
Bootstrap
Mini IOS
ROM monitor
POST
show version
Console
Mini IOS