how to recover cisco router from rommon mode

If you are a novice, exploring the capabilities of your new device, you could accidentaly change this value by entering confreg 0x instead of 0x, which will result in the router stuck in ROMmon mode when reloaded or powered on. This value can be changed from the console of the router. The value indicates the behaviour of the router and is set to 0x by default, which means that the router will attempt to load a Cisco IOS image from flash memory and load the startup configuration file from NVRAM. If you ever face the situation in which your router or switch goes to ROMmon mode during the boot process, you should first check the value of the configuration register. When you power up a Cisco router or switch, it first begins the power-on self-test POST to ensure that the device functions properly, and then it looks for the IOS from flash memory. Flash memory provides non-volatile storage, which means that the content of the memory is not lost when the device loses power or reloads. For those of you that are not familiar with the term ROMmon ROM monitor mode, it is a bootstrap program that initializes the hardware and boots the Cisco IOS software when you power on or reload a router or switch.Īlso, Cisco Internetwork Operating System IOS is the system software in Cisco devices, and is usually and by default stored in a memory area called flash as a. In this article, I will describe the problem of a router stuck in ROMmon mode, together with my recent experience.

If you have ever experienced the ROMmon mode problem, you probably came across one of the following.

How to recover cisco router from rommon mode