Wednesday, June 24, 2009

Break or recover the router password

-Turn the power switch off and back on to recycle the power.

- Press the Break key or key sequence to put the router into ROM Monitor mode. The break key varies by computer or terminal software. The sequence might be CTRL-D, CTRL-Break or another combination.

- At the > prompt, type 0 to record the current value of the configuration register normally 0x2102, or 0x102.

>o

Configuration register = 0x2102 at last boot

Bit# Configuration register option settings:

15 Diagnostic mode disabled.

-Type o/r 0x2142 to tell the router to boot from flash without loading the configuration in NVRAM at the next reload.

-Type i to have the router reboot. The router ignores the configuration in NVRAM.

-The router runs the setup dialog, Type no or press Ctrl-C to skip the initial setup Dialog.

-Type enable ate the Router> prompt to go to privileged exec mode.

-Copy the startup configuration to the running configuration by using the configure memory or copy startup-config running-config commands. Do not type configure terminal. If you use the configure terminal command, you overwrite the configuration stored in NVRAM.

-View the configuration by typing write terminal or show running-config. View the configured line, vty and enable passwords. Any encrypted passwords need to be changed.

-Enter the configuration mode by typing configure terminal. Change the line of enable passwords as necessary.

-All interfaces are in a shutdown state. Issue the no shutdown command on every interface that is to be used.

-Type config-register 0x2102 to return the router to normal operation at the next reloads.

- Exit configuration mode by pressing Ctrl-Z

-Save your changes by typing write memory or copy running-config startup-config.

- Reload the router and verify the passwords.

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