The ROM Monitor (ROMMON) is a bootstrap program that initializes the hardware and boots the Cisco IOS XE software when you power on or reload a router. If your router does not find a valid system image to load when it is booting, the system enters the ROMMON mode.
How do I use Rommon mode?
Press break on the terminal keyboard within 1 minute of power up in order to the router into ROMmon. Enter in confreg 0x2142 at the rommon 1> prompot in order to boot the from Flash. Type reset at the rommon 2> prompt. Type no after each setup question or press Ctrl+C to bypass all questions.
How do I load IOS from Rommon mode?
Copy the Cisco IOS image from the TFTP server to the Flash memory on the router. Change the configuration register value back to 2102 for the router to boot with the newly downloaded Cisco IOS image during the next reload. Reload the router by issuing the reload command.
Where is Rommon stored?
The ROMMON operating system is stored in ROM. 5. What command copies the configuration from RAM into NVRAM?
How do you break ROMmon mode?
To manually boot into the ROMmon mode, you will need to reboot the device and break the boot sequence. Pressing the Ctrl+Break key combination during boot usually does this.
How do you switch ROMmon mode?
If the switch continuously reboots, press Control-C to prevent autoboot and to get into ROMmon mode.
How do I restore IOS in Rommon mode?
Steps to Restore Cisco IOS from ROMMON Mode
- First, execute the show flash command to verify the name of the flash file and copy the file name.
- Next, execute the following commands to take the backup of the flash file on TFTP server. …
- The following figure shows how to take backup of the flash file on TFTP server.
How do I use TFTP in Rommon mode?
To use TFTP in ROMmon mode, you must first set a few environmental variables, including the IP address of the LAN interface, and then use the tftpdnld command to restore the image.
What is bootloader in Cisco switch?
This appendix describes the bootloader commands on the switch. … You gain access to the bootloader command line if the switch is set to manually boot up, if an error occurs during power-on self test (POST) DRAM testing, or if an error occurs while loading the operating system (a corrupted Cisco IOS image).
Why is there a router in Rommon mode?
There are several problems that can cause the Cisco router to get stuck in ROMmon mode. Most commonly, the error is caused during the boot process. If your router gets stuck in ROMmon mode during the boot process, examine the value of the configuration register by entering the confreg command.
What is another name for Flash Cisco?
Flash memory is generally referred to as flash The Cisco Internetwork Operating System (IOS) images are held here. Flash is erasable and reprogrammable ROM.