Familiar with ROM Monitor vro maintenance (1)

For many beginners, the ROM Monitor of Cisco routers is often unfamiliar or even daunting. The reason is very simple. First, we do not often use this mode and are not familiar with its related operations; second, Operation errors in ROM Monitor mode often cause fatal damage To routers, such as destroying IOS files in flash, resulting in system crashes. So many people put their hands on it and are discouraged.
In fact, ROM Monitor is not complex. It is only a low-level operating system of the Cisco router, which is usually used for testing and troubleshooting. It can be done easily with little time. The following describes how to use ROM Monitor, which is the two most common problems for network administrators in actual work.
Scenario 1: vro password recovery
To prevent others from knowing the vro password, especially the privileged password, and threatening local network security, many administrators have made the password particularly complex. However, after configuring the vro, we seldom operate on the vro. After a while, when we need to configure the vro, the password may be lost.
At this time, we only need a PC operating system for the Windows series), a Console cable and the corresponding interface converter, and then follow the following operations, you can easily deal.
1. Set the Super Terminal of the PC so that we can use the Console port of the vro to directly operate the vro because the process is very simple. I will omit it to save space ).
2. Start the vro and press the Break or Ctrl + Break Key in the first 60 seconds to enter the ROM Monitor mode of the vro.
3. The following describes the Cisco 2600 series routers most commonly used by beginners.
Press Ctrl + Break to enter ROM Monitor mode)
Rommon 2> confreg 0x2142
Use this command to modify the value of the configuration register of the vro so that the vro does not load the startup configuration when it is restarted next time, so as to skip user password and privileged password verification and enter the privileged mode.

You must reset or power cycle for new config to take effect rommon 3 > reset

Run the following command to restart the vro:

Would you like to enter the initial configuration dialog? [yes/no]: n

Select no to directly enter CLI Mode

Press RETURN to get started!