If you encountered reboot of the device, being a Cisco router or Switch or Wireless Device, get back to factory settings. that means device is bypassing the startup configuration. This is what you get after a reboot:
To fix this answer
If you notice Configuration register is
And when asked if you want to save the configuration, type
Some other Configuration Register codes and what they mean. The list below have been taken from the Cisco website.
--- System Configuration Dialog ---
Would you like to enter the initial configuration dialog? [yes/no]:To fix this answer
no to the question and press enter and type the following.enable
show versionIf you notice Configuration register is
0x2142 in the information displayed, then type the following enable
configure terminal
config-register 0x2102
end
reloadAnd when asked if you want to save the configuration, type
noSome other Configuration Register codes and what they mean. The list below have been taken from the Cisco website.
0x0000-0x000F | Boot Field Parameters 0×0000 Stays at the system bootstrap prompt 0×0001 Boots system image on EPROM 0x0002-0x000F Specifies a default netboot filename.0x0040 | Ignore NVRAM contents.0x0080 | OEM bit enabled to exclude details in boot messages.0x0100 | Break disabled0x0400 | IP broadcast with all zeros0x800-0x1000 | Console line speed0x2000 | Boot default ROM software if network boot fails0x4000 | IP broadcasts do not have net numbers0x8000 | Enable diagnostic message and ignore NVRAM contents 
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