Want to reset password on Cisco Catalyst 4006

SOURCE: catalyst ws-c2926 password recovery problem

1. Attach a terminal or PC with terminal emulation to the console port of the switch. Use the following terminal settings:
   9600 baud rate
   No parity
   8 data bits
   No stop bit
   
   
2. Unplug the power cable.
   
3. Hold down the mode button while reconnecting the power cord to the switch. You can release the mode button a second or two after the LED above port 1x is no longer illuminated.
   The following instructions appear:
   The system has been interrupted prior to initializing the flash file system.
   The following commands will initialize the flash file system, and finish loading
   the operating system software:
   
   flash_init
   load_helper
   boot
   
4. Type flash_init.
   
5. Type load_helper.
   
6. Type dir flash:. The switch file system is displayed:
   Directory of flash:
   2 -rwx 843947 Mar 01 1993 00:02:18 C2900XL-h-mz-112.8-SA
   4 drwx 3776 Mar 01 1993 01:23:24 html
   66 -rwx 130 Jan 01 1970 00:01:19 env_vars
   68 -rwx 1296 Mar 01 1993 06:55:51 config.text
   1728000 bytes total (456704 bytes free)
   
7. Type rename flash:config.text flash:config.old to rename the configuration file. This file contains the password definition.
   
8. Type boot to boot the system.
   
9. Enter N at the prompt to start the Setup program, Continue with the configuration dialog? [yes/no] : N
   
10. At the switch prompt type en to turn on enable mode.
    
11. Type rename flash:config.old flash:config.text to rename the configuration file with its original name.
12. Copy the configuration file into memory: Switch# copy flash:config.text system:running-config
    Source filename [config.text]? (press Return)
    Destination filename [running-config]? (press Return)
    The configuration file is now reloaded.
    
13. Change the password: switch#configure terminal
    switch(config)#enable password Cisco
    switch#control/Z
    
14. Write the running configuration to the configuration file:
    switch(config)#write memory

SOURCE: I had forgotten the password of my Cisco Catalyst 3550 Switch

password recovery procedure 3550 catalyst cisco switch
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 2>Unplug the power cable. 3>Power the switch and bring it to the switch: prompt 4>Issue the flash_init command 5>Issue the load_helper command. switch: load_helper switch: 6>Issue the dir flash: command. Note: Make sure to type a colon ":" after the dir flash.
7>Type rename flash:config.text flash:config.old to rename the configuration file. 8>Issue the boot command to boot the system. switch: boot Loading "flash:c3500xl−c3h2s−mz.120−5.WC7.bin"...############################### ################################################################################ ###################################################################### 9>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. 10>At the switch prompt, type en to enter enable mode. Switch>en Switch# 11>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# 11. Copy the configuration file into memory. 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# 11. 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.
Destination filename [running−config]? !−−− Press Return or Enter. 1131 bytes copied in 0.760 secs Sw1# The configuration file is now reloaded. 12>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 <new_secret_password> 13>!−−− To overwrite existing enable password Sw1(config)#enable password <new_enable_password> !−−− To overwrite existing vty password Sw1(config)#line vty 0 15 Sw1(config−line)#password <new_vty_password> Sw1(config−line)#login !−−− To overwrite existing console password Sw1(config−line)#line con 0 Sw1(config−line)#password <new_console_password> Write the running configuration to the configuration file with the write memory command. Sw1#write memory Building configuration... [OK]

SOURCE: How to reset the cisco catalyst 2940 switch

by reset, do you mean reboot? if so type reload

if resetting to factory type erase startup-config

SOURCE: Password Recovery for Cisco Catalyst 4506

Please see Cisco's page at http://www.cisco.com/en/US/products/hw/routers/ps5199/products_password_recovery09186a0080093e12.shtml
for step by step details and more in depth instruction.

1. Reboot
2. Press the "break" button on your keyboard within 60 seconds of the power-up to put the router into ROMMON mode.
3. confreg 0x2142
4. reset
5. type, "no" when prompted to enter the initial configuration dialog.
6. enable
7. copy startup-config running-config
8. conf t
9. enable secret <password>
11. config-register 0x2102
12. reboot again