Monday, February 2, 2009

Cisco Catalyst Switch Password Recovery


Introduction

Password recovery procedure for the Cisco Catalyst 2900XL, 3500XL, 2950, and 3550 series switches.

Step-by-Step Procedure

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

2. Unplug the power cable.

3. 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 See Figure No: 1

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 See Figure No: 2

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(config)#

!--- This output is from a 3500XL switch. Output from a 2900XL, 2950 or 3550 will vary slightly.

• 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(config)#

!--- This output is from a 2900XL switch. Output from a 3500XL, 3550 or 2950 will vary slightly.

• Issue the load_helper command.

Switch# load_helper

• Issue the dir flash: command.

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

!--- This output is from a 3500XL switch. Output from a 2900XL, 2950 or 3550 will vary slightly.

• 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.

• 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...

!--- Output truncated.
!--- This output is from a 3500XL switch. Output from a 2900XL, 2950 or 3550 will vary slightly.

• 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>enable

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#

7 comments:

nayyares said...

nice post, try to add your own comments between steps it will give more ease to a newbie !

Sohail Akhtar said...

sure i will do in next post and will try to make it simple as i can

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