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Saturday, July 25, 2009

Password recovery procedure Cisco catalyst fixed configuration layer 2 and 3 switches

Introduction
This document describes the password recovery procedure for the Cisco Catalyst Layer 2 fixed configuration switches 2900XL/3500XL, 2940, 2950/2955, 2960, and 2970 Series, as well as the Cisco Catalyst Layer 3 fixed configuration switches 3550, 3560, and 3750 Series.

Before You Begin
Conventions
For more information on document conventions, see the Cisco Technical Tips Conventions.

Prerequisites
There are no specific prerequisites for this document.

Step-by-Step Procedure
Follow the password recovery procedure below.

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

Note: For additional information on cabling and connecting a terminal to the console port, refer to Connecting a Terminal to the Console Port on Catalyst Switches.

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.

Catalyst Switch Series
LED Behavior and Mode Button Release Action

2900XL, 3500XL, 3550
Release the Mode button when the LED above Port1x goes out.

2940, 2950
Release the Mode button after approximately 5 seconds when the Status (STAT) LED goes out. When you release the Mode button, the SYST LED blinks amber.

2960, 2970
Release the Mode button when the SYST LED blinks amber and then turns solid green. When you release the Mode button, the SYST LED blinks green.

3560, 3750
Release the Mode button after approximately 15 seconds when the SYST LED turns solid green. When you release the Mode button, the SYST LED blinks green.



Note: LED position may vary slightly depending on the model.

Catalyst 3524XL



Catalyst 2950-24



For 2955 series switches only:

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. For more information, refer to Standard Break Key Sequence Combinations During Password Recovery.

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[0]: 19 files, 2 directories
flashfs[0]: 0 orphaned files, 0 orphaned directories
flashfs[0]: Total bytes: 7741440
flashfs[0]: Bytes used: 4510720
flashfs[0]: Bytes available: 3230720
flashfs[0]: 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: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:

!--- This output is from a 2900XL switch. Output from
!--- other switches will vary slightly.

Issue the load_helper command.

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

!--- This output is from a 3500XL switch. Output from
!--- other switches 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 suppressed.
!--- This output is from a 3500XL switch. Output from other switches
!--- will vary slightly.

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? [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
Sw1#The configuration file is now reloaded.

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

Write the running configuration to the configuration file with the write memory command.

Sw1#write memory
Building configuration...
[OK]
Sw1#

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