Detailed steps for Cisco router configuration

It is very important to know more about the configuration of Cisco routers. Here we mainly analyze the configuration steps of Cisco routers, have you ever encountered this problem: Because you forgot your password, you were forced to reject the original friendly "friend"-A vro or vswitch, and you were unable to reset parameters and collect statistics. The following describes how to clear passwords for several common and important network devices ".

Cisco router configuration informationThe 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 Cisco router 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.

Clear Cisco router 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 Cisco router configuration information including passwords of the vswitch ).
3. reconfigure parameters and passwords as needed.

Method 1

1. Enter the Maintenance Mode of the vswitch (Maintenance Mode), enter run defparm to restart the vswitch, and change the original configuration to the original default setting (the original default has no password ).
2. Enter the maintenance mode:
A. Close the vswitch and press the Maint button on the panel to power the vswitch;
B. Press the button to keep the System LED green light flashing for 3 seconds;
C. Release the Maint button.
3. Use the serial port of the switch to enter the switch in the terminal mode compatible with VT100 at 9600/N/8/1;
4. Press Enter until the command line prompt is displayed on the screen.

Method 2

Telnet and log on to the vswitch. If you are prompted to enter the user name, enter a common password "debug" to enter the vswitch.

Password cleanup

View the NetServer Configuration DIP switch, which controls the Configuration of the hardware Cisco router of NetServer. In this example, DIP4 controls "Erase/Reinitialize Flash Configuration ".

The cleanup procedure is as follows:

1. Set DIP4 to the on status. When NETServer is started, the Cisco router configuration information that is saved in Flash will be deleted;
2. Shut down the machine, set DIP4 to OFF, power it on, and then reconfigure it.