However, it all starts with the configuration register. The specific locations are the read-only memory, which contains the power- on self test that runs as a first step in your booting process but also contains the RAM monitor mode or shell, which provides a command-line interface for data recovery and an image corruption recovery, and also a mini version of IOS, which will run if the image and flash fails.
Some of them are the typical interfaces to communicate with the rest of the world and the processor which powers the rest of the components. The router booting process takes its components from internal locations of the router.
Components like the configuration register and the boot system commands will be critical in customizing this process, allowing you to find the order of the options and the fallback options. The important thing to understand here is the fallback options that are available in finding and loading the IOS software and the configuration files. Configuration files will be found and loaded after that and the router will offer a prompt for configuration and management across the consoled ports and other lines of access into the router if configured. After that, instructions in the bootstrap code will tell the router where and how to load the image of the operating system. Initially, the router will perform a series of self-tests (POST) to check the hardware and verify the present components. In troubleshooting your router’s operations, it is critical to understand the sequence of events that take place during the router’s bootup. We will locate those images of the operating system and explain the role of the configuration register to change the boot sequence.
We will describe about the configuration files and IOS images.
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