Let’s have a look at what Cisco OS gets booted at startup and how we caninfluence that deciscion using the configuration register. The configuration register is a 2-byte field, represented as 4 hex digits, thatyou can set with the config-register global configuration command. The last nibble of the register is called the boot field. This is the logicit uses: If boot field = 0, use the ROMMON OS. If boot field = 1, load the first IOS file found in flash memory. If boot field = 2-F:Try each b...
