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There are currently two ways to reset a Cisco router or switch to factory default.

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

Method 1

This method uses the config-register 0x2102 command in global configuration mode.

enable
configure terminal
config-register 0x2102
end
write erase
reload
<do not save>

Method 2

This method uses the config-register 0x2142 command in global configuration mode.

enable
configure terminal
config-register 0x2142
reload
<do not save>
enable
configuration terminal
config-register 0x2102
write memory
reload

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