Cisco Systems Cisco 12008 manual Meaning of Bits in the Software Configuration Register

Performing Other Configuration Tasks

The new contents of the software configuration register are saved to NVRAM. However, these new settings do not take effect until you reload the system or reboot the router.

Step 5 To display the software configuration register setting that is currently in effect as a result of Step 3 (and which will be used at the next reboot of the router), issue the show version command at the privileged EXEC mode prompt:

Router#sh ver

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#Configuration register is 0x141 (will be 0x102 at next reload)

The last line of the resulting display shows both the current configuration register setting and the new setting that will take effect when the system is reloaded or rebooted.

Step 6 Save the software configuration register setting, as described in the section entitled “Saving the Running Configuration Settings to NVRAM.”

Step 7 Reboot the router.

The software configuration register setting takes effect only after you reload the system, such as when you issue the reload command from the console or reboot the router.

This completes the procedure for changing the contents of the software configuration register. You can set the boot field to enable any desired manual or automatic boot function.

Meaning of Bits in the Software Configuration Register

As described earlier, the four low-order bits in the software configuration register (bits 3, 2, 1, and 0) make up the boot field (see Table 4-4). This field specifies a number in binary form.

If you set the boot field value to 0, you must boot the system manually by entering the boot command at the ROM monitor prompt (rommon>).

Observing System Startup and Performing a Basic Configuration 4-39