Mode ROMMON
- During the boot process, the IOS image file is loaded into the RAM.
- This mode is automatically entered by the device if the IOS image file is corrupt or missing.
- The user can debug the IOS in this mode.
- In this mode, the user has the option of loading a new IOS image file from the TFTP server or choosing a different IOS image file to boot the device.
- If there is no functional IOS, ROMMON> launches immediately.
- To begin manually, hold down the CTRL and C keys for the first 60 seconds of booting.
- Exit should be used.
- The graphic below depicts how all IOS modes interact with one another.
Common iOS Navigation Techniques in Cisco
An IOS mode is a collection of commands used to customize a set of related features or to manage a specific area of the device. IOS modes are also referred to as IOS access modes and IOS command modes. There are five IOS modes: global configuration mode, privileged EXEC mode, user EXEC mode, setup mode, and ROM Monitor mode. The first three modes are used to configure new settings, edit existing settings, and view the current settings. The following two modes are used, respectively, to configure the device initially and troubleshoot it in an emergency.