How to: Reset a Cisco Router Back to Factory Defaults

You can use config-register 0x2102 command to reset a Cisco router back to Factory Defaults. Note : to check the configuration register on...

You can use config-register 0x2102 command to reset a Cisco router back to Factory Defaults. Note: to check the configuration register on the router by issuing the show version command. The configuration register setting is displayed in the last line of the show version command output, and should be set to 0x2102.

This is example how to reset a Cisco router back to Factory Defaults:

Router1#conf t
Enter configuration commands, one per line. End with CNTL/Z.

Router1(config)#config-register 0x2102

Router1(config)#end

Router1#wr erase
Erasing the nvram filesystem will remove all configuration files! Continue? [confirm]
[OK]
Erase of nvram: complete

Router1#reload

System configuration has been modified. Save? [yes/no]: n
Proceed with reload? [confirm]