C8000 series

[Ahmad A Sadiq]

Hello House,

Has anyone observed any anomalies with the cisco 8200 loosing configurations after sudden power outage or an abruptly power outage.

I have some few routers that have that issue and would love to know if it is only me facing this.

[M02@rt37]

Hello @Ahmad A Sadiq 

what about you config register value ?

#show ver and tell us that value 0x....

Should be 0x2102

[Ahmad A Sadiq]

The config register is 0x2102.

At times after the power outage. I have to change this confreg to 0x2142 after which I return back to 0x2102

[Leo Laohoo]

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@Ahmad A Sadiq wrote:
I have to change this confreg to 0x2142 after which I return back to 0x2102

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Why is this necessary?

[Ahmad A Sadiq]

because the device doesn't allow me use the default password to login. so I have to now enter rommon mode, change the confreg value, reset, do write, change the config-register to have full access to the device

[pieterh]

>>> because the device doesn't allow me use the default password to login <<<
this suggests the password is not set to the default value after power outage, and also indicates the config is not cleared!
(I'm assuming you did change the default password(s)  after initial config? and/or use AAA for authentication?

NB! nowadays the user Cisco is removed during  initial configuration,
-> you need to have configured another user/password during initial configuration

[Ahmad A Sadiq]

Exactly! the whole config isn't cleared, however, you won't see a hostname or any other config on the device.

I actually change the default password or use AAA when the ISP is connected to the router.

[pieterh · Accepted solution]

is  by any chance the device (unintentionally) registered with Cisco DNA-Center/Catalyst-Center?

in weird cases the PnP day-zero configuration on the device is still active and DNA may be pushing a default-config to the device.

-> log the boot-process using a PC/laptop connected to the console port and force a power break

[Ahmad A Sadiq]

Some of the devices are which is pushing a default config.

thank you so much for this. The way out is to ensure the power outage is solved, or boot should be from packages.boot or Deregister devices.

[pieterh]

if you do not want this device managed using DNA Center, you can disable the PnP service
e.g. using "no pnp enable"

[Ahmad A Sadiq]

Thank you so much. 

because most times if I want to configure the router, I need to stop pnp services in order to get the details for the CSV file.

I appreciate this.