How do I change Confreg in Rommon?
How do I change Confreg in Rommon?
There are two way to change Config Register on a router. This can be done both in Rommon mode and in configuration mode. In Rommon mode, it can be change with “confreg” command. Below, we are changing Configuration Register as 0x2142.
How do I access 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 put a Cisco router in 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.
What is config register 0x2102?
The factory-default setting for the configuration register is 0x2102. This indicates that the router should attempt to load a Cisco IOS software image from Flash memory and load the startup configuration.
How do I change the boot sequence in ROMmon mode?
You cannot change the boot parameters but you can definitely upload a new image from tftp in rommon mode.
How do I get my router out of Rommon mode?
If your router gets stuck in ROMmon mode during the boot process, examine the value of the configuration register by entering the confreg command. Change the value of the configuration register as shown below to stop the router to go into the ROMmon mode after reloading.
What is Rommon prompt?
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 restore my Cisco router from ROMmon mode?
How do I exit Cisco Rommon mode?
Press the Break key within the first 60 seconds of the system boot. The break function is enabled during this period.
How do I transfer IOS files to Rommon mode?
In ROMmon mode this command will not work. You will need to use the following command instead: rommon 1>dir flash: You can use the copy command to copy the new IOS image to the flash once the IOS loaded from ROMmon is running.
How do I fix ROMmon mode?
Quick fix
- If your router gets stuck in ROMmon mode during the boot process, examine the value of the configuration register by entering the confreg command.
- Change the value of the configuration register as shown below to stop the router to go into the ROMmon mode after reloading.
How do I boot a Cisco switch from USB to ROMmon mode?
While the router is powered off, plug in the USB flash drive to the USB port on the router. Power on the router and when it starts to boot up press the Break key to enter ROMMON mode.
How do I set the configuration register in The ROMMON?
The configuration register can be set from configuration mode using the config-register command. From ROMmon, use the confreg command. Issue the show version command to view the current setting of the configuration register:
Why does the catalyst 6500/6000 switch go into RP ROMMON?
If the Catalyst 6500/6000 runs the Cisco IOS image and the boot loader image is either corrupted or missing from the MSFC1 (RP), the switch goes into either RP ROMmon or SP ROMmon at the next reload. This depends on the environment variable settings on the Catalyst 6500/6000. Find out which ROMmon the switch is in.
Why does the msfc1 (RP) boot image go into RP ROMMON?
Depending on the ROMmon version, the boot loader image that the show version command output lists is either the actual boot loader or the boot image as per the bootldr variable. If the boot loader image is either corrupted or has been deleted from the MSFC1 (RP) boot Flash, the next reload causes the switch to go into RP ROMmon.
How do I boot a switch from the RP ROMMON?
If you find that the switch is in SP ROMmon, go to Step 2. If the switch is in RP ROMmon, go to Step 3. From the SP ROMmon, issue the boot command. The command puts the switch in the RP ROMmon: rommon 1 > boot Self decompressing the image : ################################################# !—