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.
Also, 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.įlash memory provides non-volatile storage, which means that the content of the memory is not lost when the device loses power or reloads. In this article, I will describe the problem of a router stuck in ROMmon mode, together with my recent experience.įor 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. If you have ever experienced the ROMmon mode problem, you probably came across one of the following.
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