Password Recovery Procedure for the Cisco 2600 and 2800 Series Routers
Complete these steps in order to recover your password:[*] Attach a terminal or PC with terminal emulation to the console port of the router.
Use these terminal settings:
[*] 9600 baud rate
[*] No parity
[*] 8 data bits
[*] 1 stop bit
[*] No flow control
[*] If you can access the router, type show version at the prompt, and record the configuration register setting. See Example of Password Recovery Procedure in order to view the output of a show version command.
Note: The configuration register is usually set to 0x2102 or 0x102. If you can no longer access the router (because of a lost login or TACACS password), you can safely assume that your configuration register is set to 0x2102.
[*] Use the power switch in order to turn off the router, and then turn the router back on.
cisco 2821 重启路由器前，将flash卡，从路由器内弹出，这样，路由器重新启动时，找不到ios进行加载，于是会自动进入ROMMON模式，一般情况下，ios从flash加载后，运行的NVRAM中，路由器正常使用过程中，抽出flash卡，是没有影响的；
4.Press Break on the terminal keyboard within 60 seconds of power up in order to put the router into ROMmon.
5.Type confreg 0x2142 at the rommon 1> prompt in order to boot from Flash. This step bypasses the startup configuration where the passwords are stored.
6.Type reset at the rommon 2> prompt The router reboots, but ignores the saved configuration.
7.Type no after each setup question, or press Ctrl-C in order to skip the initial setup procedure.
8.Type enable at the Router> prompt. You are in enable mode and should see the Router# prompt.
9.Type configure memory or copy startup-config running-config in order to copy the nonvolatile RAM (NVRAM) into memory.
10. Type enable secret <password> in order to change the enable secret password. For example:
hostname(config)#enable secret cisco
11. Type config-register <configuration_register_setting>. Where configuration_register_setting is either the value you recorded in step 2 or 0x2102 . For example:
hostname(config)#config-register 0x2102
12. wr
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