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Old Cisco 837 Router. Missing username and password

Answered Question
Dec 11th, 2009
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Would anybody know how to reset them to factory default. Our current Netowork environement doens't need this router no more but I would like to use it in our test lab with a pix501


Correct Answer by tprendergast about 7 years 8 months ago

Read this article, it will explain how to do password recovery on it so you can use it in your lab: http://www.cisco.com/en/US/products/hw/routers/ps380/products_password_recovery09186a00800942bc.shtml

Hope that helps, please rate if it does.



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Overall Rating: 5 (1 ratings)
julienf28 Fri, 12/11/2009 - 16:59
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thanks...this was exactly what I needed.

Now for the config part.

vvasisth Sat, 12/12/2009 - 01:38
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  • Silver, 250 points or more

Step-by-Step Procedure

Follow these steps in order to recover your password:

  1. Attach a terminal or PC with terminal emulation to the console port             of the router.

    Use these terminal settings:

    • 9600 baud rate

    • No parity

    • 8 data bits

    • 1 stop bit

    • No flow control

    Refer to these documents for information on how to cable and             connect a terminal to the console port or the AUX port:

  2. If you can access the router, type show             version at the prompt, and record the configuration register             setting. See Example of Password Recovery             Procedure in order to view the output of a show             version command

    Note: The configuration register is usually set to 0x2102 or 0x102. If                 you can no longer access the router (because of a lost login or TACACS                 password), you can safely assume that your configuration register is set to                 0x2102.

  3. Use the power switch in order to turn off the router, and then turn             the router back on.

    Important Notes:

    • In order to simulate this step on a Cisco 6400, pull out and                 then plug in the Node Route Processor (NRP) or Node Switch Processor (NSP)                 card.

    • In order to simulate this step on a Cisco 6x00 with NI-2, pull                 out and then plug in the NI-2 card.

  4. Press Break on the terminal keyboard within 60             seconds of power up in order to put the router into ROMMON.

    If the break sequence does not work, refer to             Standard             Break Key Sequence Combinations During Password Recovery for other key             combinations.

  5. Type confreg 0x2142 at the             rommon 1> prompt in order to boot from             Flash.

    This step bypasses the startup configuration where the passwords             are stored.

  6. Type reset at the rommon             2> prompt.

    The router reboots, but ignores the saved configuration.

  7. Type no after each setup question, or press             Ctrl-C in order to skip the initial setup             procedure.

  8. Type enable at the             Router> prompt.

    You are in enable mode and should see the             Router# prompt.

  9. Type configure memory or             copy startup-config running-config in order to copy             the nonvolatile RAM (NVRAM) into memory.

    Important: Do not type             copy running-config startup-config or             write. These commands erase your startup             configuration.

  10. Type show running-config.

    The show running-config command shows             the configuration of the router. In this configuration, the             shutdown command appears under all interfaces, which             indicates all interfaces are currently shut down. In addition, the passwords             (enable password, enable secret, vty, console passwords) are in either an             encrypted or unencrypted format. You can reuse unencrypted passwords. You must             change encrypted passwords to a new password.

  11. Type configure terminal.

    The hostname(config)# prompt             appears.

  12. Type enable secret             <password> in order to change the             enable secret password. For example:

    hostname(config)#enable secret cisco

  13. Issue the no shutdown command on every             interface that you use.

    If you issue a show ip interface brief command, every interface that you want to use should display up             up.

  14. Type config-register             <configuration_register_setting>.             Where             configuration_register_setting is either the value you recorded in step 2 or             0x2102 . For example:

    hostname(config)#config-register 0x2102

  15. Press Ctrl-z or end in order to             leave the configuration mode.

    The hostname# prompt appears.

  16. Type write memory or copy             running-config startup-config in order to commit the changes.


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