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certification cisco yaounde.The configuration register value is 4 hexadecimal bits long (16 binary bits), each of which indicates the function that the bootloader should perform. Therefore, great care must be taken when configuring this value on the router.Many websites offer downloadable Cisco router configuration register utilities. Boson offers one such free program at www.boson.com/FreeUtilities.htmlo, which allows you to select or deselect specific boot options and it will automatically generate the correct configuration register value for you.When entering a configuration register value, you must prefix it with Ox,indicating that it is a hexadecimal value. If you do not do this, the router will assume that the value entered is a decimal value and will convert it to hexadecimal. On Cisco routers, the configuration register value defaults to 0x2102, which causes the router to use the default boot process to find and load I0S images and configuration files. If you change it to 0x2142, it will tell the bootloader to use the default method of finding the IOS on the next reboot, but instead of loading the configuration file in NVRAM, it will go directly to the system configuration dialog. This is the configuration register value used when performing the password recovery process.The configuration register value defaults to 0x2102, which causes the router to use the default boot process (look for the boot system command in the boot configuration file, and if it does not find it, load the first IOS in flash memory, then load the default boot configuration file). To see the configuration register value, use the command showversion) If you modify this value, you will see the original value as well as the value that will be used when the router reboots. The router boots without loading the configuration, but NVRAM contains the configuration file. check the router's configuration register to see if it is set to 0x2142: This configuration register setting causes the IOS to ignore the configuration file in NVRAM.Modifying Configuration Registers in ROMMON Mode Of course, one of the problems with modifying configuration register values in configuration mode is that you have to enter privileged EXEC mode first. This can be a problem if you do not know the router password. However, a second method allows you to modify the configuration register values without logging into the router. To use this method, you need to access the router through the console - you cannot do this when accessing the router through a secondary line or VTY session. Next, you need to reboot the router and then enter ROMMON mode while the router is booting. To do this, press Ctrl-Breako after the bootloader loads Please note that the control sequence for entering ROMMON mode may vary with the terminal emulation program you are using on your PC. A multimedia demonstration of using the command confreg in ROMMON mode and using the IOSCLI command config-register to modify router configuration register values is included in the digital resources that accompany this book.As a shortcut, you can also execute the command confreg 0x2142 in ROMMON mode.Chapter 15 Router Initial Configuration 365Once you enter ROMMON mode, you can start modifying the values of the configuration registers. To do this, one of two methods can be used, depending on the router model. On the 1900, 1800, and 2600 series Cisco routers, you can use the command confteg. this script asks some basic questions about the router's functionality and the startup process. the advantage is that you do not need to know the required hexadecimal configuration register values because the router will be created for you when you answer these questions. Here is an example of how to use this script.rommon 5 > confregConfiguration Summary-enabled are: load rom after netboot fails consolebaud: 9600 boot: image specified by the boot system commands