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This document describes the procedure for performing password recovery on Cisco 750/760 series routers using the NVRAM erase code (750erase.hex or 760erase.hex). Choose the appropriate Terminal Emulation Package (Windows95 and Windows3.1x instruction are included).

Power cycle the router. While it is booting up, press the ESC key a couple of times. This will put the unit into a software load mode. The unit will respond with the following prompts:

Ready to upload new firmware into flash. Baud (1=19.2K, 2=2400, 3=38.4K, 9=9600)?

Select the baud rate for the transfer (in this example 9600 is chosen). The unit will respond with the following prompt.

Begin ascii upload at 8n1/9600 baud.

Start the ascii file transfer of the image, 750erase.hex for the 750 series or 760erase.hex for the 760 series. These files are not interchangeable. This file must be treated as a text file for loading into the unit via the console port. At 9600, the transfer takes approximately 12 minutes. While the transfer is occuring, the LINE LED will be flashing rapidly. When the transfer is complete the unit will respond with the following prompts and then reboot itself:

Firmware transfer successful.

Now writing firmware into FLASH, standby ...

Firmware upload complete.

Erase Version of 750/760 firmware This will erase all configured parameters

ERASING NVRAM...

(reboots itself)

Ready to upload new firmware into flash.

Baud (1=19.2K, 2=2400, 3=38.4K, 9=9600)?

At this point, reload the original software repeating step 2.

Procedure for performing a text/ascii transfer using Windows95 Hyperterminal

Choose Properties from the File Menu

Choose Settings Tab

Choose ASCII Setup Button

Make sure that both "Line Delay" and "Character Delay" are set to zero.

Make sure that "Send line ends with line feeds is check marked".

Click the OK Button on both screens.

Close Hyperterminal and then restart it.

Choose Send Text File... from the Transfer menu.

Locate file (may have to change Files of Type to All Files) and highlight it.

Click the OK Button.

The file is now being transferred to the unit...there may not be any indication that the file is transferring except for the LINE LED on the front of the unit. While the transfer is occuring, the LINE LED will be flashing rapidly on the front of the unit.

Procedure for performing a text/ascii transfer using Windows Terminal

Choose Text Transfers... from the Settings Menu.

Make sure that "Standard Flow Control" is chosen.

Click the OK Button.

Choose Send Text File... from the Transfer Menu.

Locate file (may have to change List Files of Type to All Files) and highlight it.

Make sure that neither Append LF nor Strip LF are check marked.

Click the OK Button.

The file is now being transferred to the unit...there may not be any indication that the file is transferring except for the LINE LED on the front of the unit. While the transfer is occuring, the LINE LED will be flashing rapidly on the front of the unit.


Cisco路由器口令的恢复(600)

The steps below describe how to recover a password on the Cisco 600 series of routers.

Step 1: Enter RMON mode.

To do this, follow the steps below:

Connect your PC to the console port of the router.

Set your Terminal Access Program (such as HyperTerminal in Windows) to the following settings:

Baud rate: 38400 bps recommended (standard 9600 bps possible)

Data bits: 8

Parity: None

Stop bits: 1

Flow control: None

Power cycle the router (turn the router off, then on using the router's power switch)

As soon as you see the Hello! prompt, type Ctrl-C.

You are now in RMON mode.  

Step 2: If you need to save the configuration file, execute the following command:

db fef80030 100

This command prints the configuration to the screen. The last number indicates the number of bytes to display. Use a value of 100 bytes or more for the number of bytes to display.

Note: You must use the enable password command for the password to display encrypted during password recovery.

Step 3: Look for your encrypted password.

The text of the password will be altered by two letters. For example, using the key a = c, b = d, c = e, and so on, the password "cisco" would be "agqam".

Step 4: (This step is optional.) Erase the current configuration.

An example is shown below:

=>es 6

Erasing sector 00000006...

Sector erased

=>rb

Hello!

CBOS v2.0.1.01

Note: This step reboots a Cisco 600 series router with no configuration. You will need to redo the configuration and then use the write command to save the changes to NVRAM.

Step: 5: Reboot the router.

An example is shown below:

rb

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