个人学习笔记，若有侵权，请告知！
- 配置寄存器值：简单的理解为对路由器开机的配置
- 0x2142 //开机时不加载配置文件
- 0x2102 //开机时加载配置文件
备份IOS
- 需要TFTP服务器，同时确保能够ping通TFTP服务器的地址
Router#copy startup-config tftp: //将startup-config备份到tftp服务器上
Router#copy flash: tftp: //将IOS备份到tftp服务器上
Source filename []? c2500-is-l.122-15.T14.bin //要备份的IOS名字
Address or name of remote host []? 172.16.1.100 //服务器的地址
Destination filename [c2500-is-l.122-15.T14.bin]? //备份到tftp服务器上的名字(直接回车)
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
16423684 bytes copied in 278.752 secs (58919 bytes/sec)
Router#
升级IOS
- 准备工作
- 备份设备配置
- 备份设备IOS
- 需要TFTP服务器，同时确保能够ping通TFTP服务器的地址
Router#copy tftp flash 从TFTP服务器上将新的IOS拷贝到Router的flash中
Address or name of remote host [255.255.255.255]? 172.16.1.100 //TFTP服务器的地址
Source filename []?c2800nm-advsecurityk9-mz.124-12.bin //新IOS文件名
Destination filename [c2800nm-advsecurityk9-mz.124-12.bin]? //拷贝到flash后的文件名(直接回车)
%Warning: There is a file already existing with this name
Do you want to over write? [confirm][enter]
Accessing tftp://172.16.1.100/c2800nm-advsecurityk9-mz.124-12.bin...
Loading c2800nm-advsecurityk9-mz.124-12.bin from 172.16.1.100 (via Ethernet0):
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
21710744 bytes copied in 82.880 secs (261954 bytes/sec)
Router#reload //重启设备
密码恢复
- 只能通过console口破解
- 路由器默认的寄存器值是0x2102 （启动路由器，加载IOS，并读取NVRAM的配置文件）
重启计算机，在开机前30s 按住ctrl+break 发送一个break信号
rommon 1> //路由器将进入ROM监控模式
rommon 1>confreg 0x2142 //不读取NVRAM 中的配置
rommon 2>reset 或 i //重启路由器，绕过加载NVRAM 里面的配置
Router#show version
Configuration register is 0x2142 //查看到以修改为0x2142
Router#copy startup-config running-config //调用NVRAM的配置到RAM中
Router#conf t
Router(config)#no enable secret //删除原密码
Router(config)#no enable password //删除原密码
Router(config)#enable password xxx //建立新密码
Router(config)#config-register 0x2102 //把寄存器值改回原来数值
Router#write //将RAM中的配置保存到NVRAM中
Router#reload //重启路由器
