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Cisco Password Recovery


wildweaselmi
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Follow the password recovery procedure below.



  1. Attach a terminal or PC with terminal emulation (for example, Hyper Terminal) to the console port of the switch.


    Use the following terminal settings:
    • Bits per second (baud): 9600
    • Data bits: 8
    • Parity: None
    • Stop bits: 1
    • Flow Control: Xon/Xoff
Unplug the power cable.Power the switch and bring it to the switch: prompt:



For 2900XL, 3500XL, 2940, 2950, 2960, 2970, 3550, 3560, and 3750 series switches, do this:



Hold down the mode button located on the left side of the front panel, while you reconnect the power cable to the switch.



The Catalyst 2955 series switches do not use an external mode button for password recovery. Instead the switch boot loader uses the break-key detection to stop the automatic boot sequence for the password recovery purposes. The break sequence is determined by the terminal application and operating system used. Hyperterm running on Windows 2000 uses
Ctrl + Break. On a workstation running UNIX, Ctrl-C is the break key.

  1. The example below uses Hyperterm to break into switch: mode on a 2955.

    C2955 Boot Loader (C2955-HBOOT-M) Version 12.1(0.0.514), CISCO DEVELOPMENT TEST VERSION

    Compiled Fri 13-Dec-02 17:38 by madison

    WS-C2955T-12 starting...

    Base ethernet MAC Address: 00:0b:be:b6:ee:00

    Xmodem file system is available.

    Initializing Flash...

    flashfs: 19 files, 2 directories

    flashfs: 0 orphaned files, 0 orphaned directories

    flashfs: Total bytes: 7741440

    flashfs: Bytes used: 4510720

    flashfs: Bytes available: 3230720

    flashfs: flashfs fsck took 7 seconds

    ....done initializing flash.

    Boot Sector Filesystem (bs:) installed, fsid: 3

    Parameter Block Filesystem (pb:) installed, fsid: 4

    *** The system will autoboot in 15 seconds ***Send break character to prevent autobooting.

    !--- Wait until you see this message before

    !--- you issue the break sequence.

    !--- Ctrl+Break is entered using Hyperterm.

    The system has been interrupted prior to initializing the flash file system to finish loading the operating system software:

    flash_init

    load_helper

    boot

    switch:
  2. Issue the flash_init command.

    switch:
    flash_init

    Initializing Flash...

    flashfs: 143 files, 4 directories

    flashfs: 0 orphaned files, 0 orphaned directories

    flashfs: Total bytes: 3612672

    flashfs: Bytes used: 2729472

    flashfs: Bytes available: 883200

    flashfs: flashfs fsck took 86 seconds

    ....done Initializing Flash.

    Boot Sector Filesystem (bs:) installed, fsid: 3

    Parameter Block Filesystem (pb:) installed, fsid: 4

    switch:

    !--- This output is from a 2900XL switch. Output from

    !--- other switches will vary slightly.
  3. Issue the load_helper command.

    switch:
    load_helper

    switch:
  4. Issue the dir flash: command.


    Note: Make sure to type a colon ":" after the dir flash.


    The switch file system is displayed:

    switch:
    dir flash:

    Directory of flash:/

    2 -rwx 1803357
    c3500xl-c3h2s-mz.120-5.WC7.bin

    !--- This is the current version of software.

    4 -rwx 1131
    config.text

    !--- This is the configuration file.

    5 -rwx 109 info

    6 -rwx 389 env_vars

    7 drwx 640 html1

    8 -rwx 10

    9 info.ver

    403968 bytes available (3208704 bytes used)

    switch:

    !--- This output is from a 3500XL switch. Output from

    !--- other switches will vary slightly.
  5. Type rename flash:config.text flash:config.old to rename the configuration file.

    switch:
    rename flash:config.text flash:config.old

    switch:

    !--- The
    config.text
    file contains the password !--- definition.
  6. Issue the boot command to boot the system.

    switch:
    boot

    Loading "flash:c3500xl-c3h2s-mz.120-5.WC7.bin"...#####################################################################################################################################################################################

    File "flash:c3500xl-c3h2s-mz.120-5.WC7.bin" uncompressed and installed, entry point: 0x3000

    executing...

    !--- Output suppressed.

    !--- This output is from a 3500XL switch. Output from other switches

    !--- will vary slightly.
  7. Enter "n" at the prompt to abort the initial configuration dialog.

    --- System Configuration Dialog ---

    At any point you may enter a question mark '?' for help.

    Use ctrl-c to abort configuration dialog at any prompt.

    Default settings are in square brackets '[]'.

    Continue with configuration dialog? : n

    !--- Type "n" for no.

    Press RETURN to get started.

    !--- Press
    Return
    or
    Enter
    .

    Switch>

    !--- The Switch> prompt is displayed.
  8. At the switch prompt, type en to enter enable mode.

    Switch>
    en

    Switch#
  9. Type rename flash:config.old flash:config.text to rename the configuration file with its original name.

    Switch#
    rename flash:config.old flash:config.text

    Destination filename

    !--- Press
    Return
    or
    Enter
    .

    Switch#
  10. Copy the configuration file into memory.

    Switch#
    copy flash:config.text system :running-config

    Destination filename ?

    !--- Press
    Return
    or
    Enter
    .

    1131 bytes copied in 0.760 secs

    Sw1#

    The configuration file is now reloaded.

  11. Overwrite the current passwords that you do not know. Choose a strong password with at least one capital letter, one number, and one special character.


    Note: Overwrite the passwords which are necessary. You need not overwrite all of the mentioned passwords.

    Sw1#
    conf t

    !--- To overwrite existing secret password

    Sw1(config)#
    enable secret

    !--- To overwrite existing enable password

    Sw1(config)#
    enable password

    !--- To overwrite existing vty password

    Sw1(config)#
    line vty 0 15

    Sw1(config-line)#
    password

    Sw1(config-line)#
    login

    !--- To overwrite existing console password

    Sw1(config-line)#
    line con 0

    Sw1(config-line)#
    password
  12. Write the running configuration to the configuration file with the write memory command.

    Sw1#
    write memory

    Building configuration...

    Sw1#

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  • 1 year later...

1. Unplug the switch.





2. While holding the Mode button on the left side of front panel , reconnect power.





3. When the LED above Port 1x goes out, release the Mode button.





4. Issue the flash_init command:



switch: flash_init


Initializing flash...














5. Issue the load_helper command:



switch: load_helper


switch:










6. Rename the configuration file:



switch: rename flash:config.text flash:config.old










7. Boot the switch using the boot command:



switch: boot


Loading "flash:c3550-i9q3l2-mz...EA1c.bin"...########




Would you like to enter the initial configuration dialog?





8. Select "yes" when you are ready to configure the switch or "no" to start without configuration wizard. You're done.



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