How to reset a Cisco Router

What you will do when you face a login problem once you get a Cisco Router?
Will there any reset button on Cisco Router?

Definitely is NOT!

By the way, here is the step guide you on resetting Cisco Router to factory default setting.
Stay Calm =)

To reset a Cisco router to factory default (removing the startup configuration file), you need to be perform these steps:

To erase the configuration file, issue the erase nvram: command.
Reload the router and attempt to break into ROM Monitor (ROMmon) by issuing the break sequence (usually Ctrl and break from the Hyperterminal) from a console connection.

You should see this ROMmon prompt:
rommon 1>

Then, Change the configure register value to ignore the startup configuration by issuing the confreg command, as shown in this example:
rommon 2> confreg 0×2142

To reload the router, issue the reset command, as shown in this example:
rommon 3> reset

After the router boots, issue the enable command at the Router > prompt.
Router > en
The prompt changes to Router#, indicating that the router is now in privileged mode.

To enter config mode, issue the config terminal command.
You should now see a prompt as below.
Router(config)#

To change the configure register to recognize the startup configuration, issue the config-register command, as shown in this example:
Router (config)# config-register 0×2102

To break out of configuration mode, press Ctrl and Z.
To save the blank configuration, issue the copy-running config-startup config command.

Good Luck =)


Reference: http://www.cisco.com/en/US/products/sw/iosswrel/ps5187/products_tech_note09186a00802017a1.shtml