Description
This document describes how to recover a password on a Cisco Catalyst 1600.

Step-by-Step Procedure
1.Push and hold the Reset button on the switch until the LCD display shows "erasing mg mt passwd."
2.Release the Reset button.
  The switch resets and has no password.

1800:

Description
This document describes how to recover a password on a Cisco Catalyst 1800.

Step-by-Step Procedure
1.Locate the two small black buttons mounted side by side on the red holding device inside the left cover of the switch.
The button located nearest the front of the switch is the NMI button.

2.Boot the router.
3.At the prompt for the password, press the NMI button five times.
The switch reloads and the password resets to its default value of "public."

3900:

Description
This document describes the password recovery procedure for the Cisco Catalyst 3900.

Step-by-Step Procedure
Caution: A download of the main image is forced when you press SysReq for more than five seconds.

1.Press SysReq on the switch (next to the Reset button).
2.On the System Request menu, select Clear the System Password.
This clears only the system password. All other configuration parameters are saved in non-volatile RAM (NVRAM) and are retained.