How does a router choose which operating system to load?
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How does a router choose which operating system to load?
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When bootstrap is run during the boot process of a router, it looks for the boot field in the configuration register. According to the hexadecimal code, it chooses which operating system (OS) to load into RAM. The table below shows the values used in the boot field and the choices made by the router to load the OS.
| 0 | ROMMON OS |
| 1 | The first IOS found in Flash memory |
| 2-F | Try each boot system command in the startup-config file in the given sequence till one works. |
| If none of the boot system commands work, load the first IOS file found in Flash memory. |
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