Tips for clearing router configuration information and passwords (1)

Have you ever encountered this problem in daily network management and maintenance: You have been forcibly rejected by a vro or vswitch, a former "friend", because you forgot your password, parameter resetting and information statistics are not allowed. The following describes how to clear passwords for several common and important network devices ".

Clearing Cisco router configuration information and passwords
Applicable scope: All Cisco 10.0, 2000, 2500, 3000 and 4000 vrouters of IOS 7000 and later versions.

The cleanup procedure is as follows:

1. Connect to the Console port with the serial line of the vro. The following is done through the Win95 Super Terminal;

2. After the router power-on 60 seconds, press CTRL (if not press the CTRL-BREAK) Key, waiting for the prompt ">;

3. type the "> e/s 2000002" command, and record the return value, which will be used in the subsequent "Router (config) # config-register 0x2102" command. (generally, the return value is 2102)

4. Enter "o/r 0x42" after the ">" symbol ";

5. Type "I" and the vro will be reinitialized. If you have any questions, answer No;

6. Type "Enable" (no password, press Enter );

7. Change the password (whether encrypted or not ):

A. Enter "config mem" or "copy startup-config mem ";

B. Enter "write ";

C. Enter "config term" and "enable secret <password>" and "enable password <password>" to change the password;

8. Remove the user prompt and password:

A. Enter the virtual line configuration mode and enter "line vty 0 4 ";

B. Enter "password <password>" to change the password;

C. Enter "login" to remove the user prompt, Which is login local );

9. Press Ctrl-z to finish;

10. Enter "write" to save the changes;

11. Enter the privileged configuration mode and type "config-register 0x2102" (note that this step must be completed );

12. Write to save the configuration information;

13. Exit the configuration mode. Reload and restart the vro.

Note: o/r 0x42 is used to guide the router from Flash. If the router fails, you can use o/r 0x41 to guide the router from the ROM. Other operations are the same as o/r 0x42, however, it is best to use it only when Flash Boot fails, Flash content is deleted, or Flash content is not available. With 0x41, you can only view or delete configuration information, but cannot change the password.

Clearing Cisco Catalyst 3000 configuration information

1. When the switch is powered on and started, press and hold the Sys Req button on the back panel of the switch for 5 seconds, and then release it;

2. Go to the configuration menu and select "Clear Non-Volatile RAM" to Clear all configuration information including passwords of the vswitch ).

3. reconfigure parameters and passwords as needed.