Recuperar la contraseña en un Switch Cisco

 Resumen:

This document describes the password recovery procedure for the Cisco Catalyst 2900XL, 3500XL, 2950, and 3550 series switches.




Step-by-Step Procedure

• 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.   

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

For 2900/3500XL and 3550 Series switches: release the mode button after the LED above Port 1x goes      out.
Note: LED position may vary slightly depending on the model.

Catalyst 3524XL

For 2950 Series switches: release the mode button after the STAT LED goes out.
Note: LED position may vary slightly depending on the model.
Catalyst 2950-24

 

The following instructions appear:

    The system has been interrupted prior to initializing the
    flash filesystem.  The following commands will initialize
    the flash filesystem, and finish loading the operating
    system software:
        flash_init
        load_helper
        boot
        switch:

• Issue the flash_init command.

          switch: flash_init
          Initializing Flash...
          flashfs[0]: 143 files, 4 directories
          flashfs[0]: 0 orphaned files, 0 orphaned directories
          flashfs[0]: Total bytes: 3612672
          flashfs[0]: Bytes used: 2729472
          flashfs[0]: Bytes available: 883200
          flashfs[0]: flashfs fsck took 86 seconds
          ....done Initializing Flash.
          Boot Sector Filesystem (bs:) installed, fsid: 3
          Parameter Block Filesystem (pb:) installed, fsid: 4
          switch:

• Issue the load_helper command.

           switch: load_helper
           switch:

• Issue the dir flash: command.

          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                      html
        18   -rwx  109                      info.ver
        403968 bytes available (3208704 bytes used)
        switch:

• Type rename flash:config.text flash:config.old to rename the configuration file.

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

• 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 po
          int: 0x3000
         executing...

• Enter "n" at the prompt to start the Setup program.

           --- 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? [yes/no]: n

          !--- Type "n" for no.

          Press RETURN to get started.

          !--- press Return or Enter.

          Switch>

          !--- The Switch> prompt is displayed.

•  At the switch prompt type en to enter enable mode.

           Switch>en
           Switch#

•  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 [config.text]

           !--- Press Return or Enter.

           Switch#

• Copy the configuration file into memory:

           Switch#copy flash:config.text system:running-config
           Destination filename [running-config]?
 
           !--- Press Return or Enter.

           1131 bytes copied in 0.760 secs
           Switch#
           The configuration file is now reloaded.

• Change the password:

           Switch#configure terminal
           Switch(config)#no enable secret

           !--- This step is necessary if the switch had an enable secret password.

           Switch(config)#enable password Cisco
           Switch#(config)#^Z

      !--- Control/Z.

• Write the running configuration to the configuration file with the write memory command:

           Switch#write memory
           Building configuration...
           [OK]
           Switch#

•  Hemos terminado.

Fuente Cisco Systems, Inc. -> http://www-tss.cisco.com/eservice/compass/common/activities/password_cat_2950.htm

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