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Cisco 2500 Router : How to enable password recovery

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  1. #1
    jigs
    jigs is offline eTI Iron

    Cisco 2500 Router : How to enable password recovery

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    Enable Secret Password Recovery Procedures
    - Attach a PC to the console port of the router. Password recovery cannot be done remotely.
    - Type a show version at the console prompt. You only have to be in User mode to run the show version command. Make a note of the configuration register number. It will almost always be 0x2102, but might be 0x102. If you cannot do a show version use 0x2102 or check a similar router for it’s configuration register.
    - Once you have this information follow these steps:
    Basic Steps
    • Power reset the router.
    • Go into ROMMON mode for password recovery.
    • Set the configuration register to boot the router without loading the configuration file.
    • Reboot the router.
    • Copy the startup-configuration into memory.
    • Go into Global Configuration mode and change the password.
    • Reset the configuration register to boot the router using the startup configuration file.
    • Save the configuration back to NVRAM.
    • Reboot the router.

    Step 1 Power reset the Router.

    Step 2 Within 60 seconds of the router reboot, press the Ctrl+Break keys. This puts the router in ROMMON mode.

    Step 3 The router should boot to a router> prompt with no router name.

    Step 4 Type o/r 0x42 at the router> prompt. This tells the router to boot from Flash Memory without loading the configuration file. If you want to boot from ROM instead, type o/r 0x41.
    However, booting from ROM allows you to only view the encrypted password or erase the configuration. You cannot change the password.

    Step 5 Type i at the router prompt. The router will now reboot, but ignore it’s saved configuration (which contains the forgotten password).

    Step 6 When the router boots up it will ask you if you want to configure the router. Press Ctrl+C to break out of the startup configuration.

    Step 7 Type enable at the router> prompt. This will put you in enable or Privileged mode and the prompt will look like this: router#

    Step 8 Type copy startup-config running-config (or copy start run) to copy the startup configuration into memory. With the startup configuration in memory you can now change the enable secret password.

    Step 9 At the router# prompt type config t to go into global configuration mode.

    Step 10 At the router(config)# prompt type enable secret new_password where new_password is a new password.

    Step 11 You now need to change your configuration register to tell the router to boot up with the startup configuration file. Type config-register 0x2102 and press enter. This tells the router to load the startup-config file in NVRAM when it boots up. (use the number you saved from the show version command)
    Step 12 Press Ctrl+Z to leave global configuration mode.

    Step 13 At the router# prompt type copy running-config startup-config (or copy run start). This will save your password change to NVRAM.

    Step 14 Type reload and press enter to reboot the router.


  2. #2
    nupur.
    nupur. is offline eTI Copper

    Re: Cisco 2500 Router : How to enable password recovery

    Good info Jigs.. Thanks for Sharing !

  3. #3
    jigs
    jigs is offline eTI Iron

    Re: Cisco 2500 Router : How to enable password recovery

    thanks a lot

  4. #4
    Sbs
    Sbs is offline eTI Member

    Re: Cisco 2500 Router : How to enable password recovery

    Hi Jigs
    That was great man...Wow!!

  5. #5
    Phrozen
    Phrozen is offline Just in!

    Re: Cisco 2500 Router : How to enable password recovery

    Hey I was trying to configure a Cisco 2500 we have for internet access, but it seems i cannot get a prompt or any other type of command input. I have tried sending breaks and all but nothing seems to works, this is all I see on Power On. It does not let me input any commands at all in any part of the process.

    ------------------------------------------------------------------------------------------------------------------------------------------

    System Bootstrap, Version 11.0(10c), SOFTWARE
    Copyright (c) 1986-1996 by cisco Systems
    2500 processor with 2048 Kbytes of main memory

    %SYS-4-CONFIG_NEWER: Configurations from version 11.3 may not be correctly under
    stood.
    F3: 4835864+66448+338152 at 0x3000060

    Restricted Rights Legend

    Use, duplication, or disclosure by the Government is
    subject to restrictions as set forth in subparagraph
    (c) of the Commercial Computer Software - Restricted
    Rights clause at FAR sec. 52.227-19 and subparagraph
    (c) (1) (ii) of the Rights in Technical Data and Computer
    Software clause at DFARS sec. 252.227-7013.

    cisco Systems, Inc.
    170 West Tasman Drive
    San Jose, California 95134-1706



    Cisco Internetwork Operating System Software
    IOS (tm) 2500 Software (C2500-I-L), Version 11.3(4), RELEASE SOFTWARE (fc1)
    Copyright (c) 1986-1998 by cisco Systems, Inc.
    Compiled Tue 16-Jun-98 02:54 by phanguye
    Image text-base: 0x03028EE0, data-base: 0x00001000

    cisco 2509 (68030) processor (revision M) with 2048K/2048K bytes of memory.
    Processor board ID 10354009, with hardware revision 00000000
    Bridging software.
    X.25 software, Version 3.0.0.
    1 Ethernet/IEEE 802.3 interface(s)
    2 Serial network interface(s)
    8 terminal line(s)
    32K bytes of non-volatile configuration memory.
    8192K bytes of processor board System flash (Read ONLY)



    Press RETURN to get started!


    %LINK-3-UPDOWN: Interface Ethernet0, changed state to up
    %LINK-3-UPDOWN: Interface Serial0, changed state to down
    %LINK-3-UPDOWN: Interface Serial1, changed state to down
    %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0, changed state to down

    %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0, changed state to down
    %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1, changed state to down
    %SYS-5-CONFIG_I: Configured from memory by console
    %SYS-5-RESTART: System restarted --
    Cisco Internetwork Operating System Software
    IOS (tm) 2500 Software (C2500-I-L), Version 11.3(4), RELEASE SOFTWARE (fc1)
    Copyright (c) 1986-1998 by cisco Systems, Inc.
    Compiled Tue 16-Jun-98 02:54 by phanguye

    -----------------------------------------------------------------------------------------------------------------------------------------

    Any idea how can I configure my router?? I really need to

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