Installation guide

Cisco 4000 Series Virtual Configuration Register D-3

Virtual Configuration Register Settings

Take the following steps to change the conﬁguration register while running the Cisco IOS

software:

Step 1 Enter the enable command and your password to enter the privileged level, as

follows:

router> enable

Password:

router#

Step 2 At the privileged-level system prompt (router #), enter the command conﬁgure

terminal.

You will be prompted as shown in the following example:

router# configure term

Enter configuration commands, one per line.

Edit with DELETE, CTRL/W, and CTRL/U; end with CTRL/Z

Step 3 To set the contents of the conﬁguration register, enter the conﬁg-register value

conﬁguration command where value is a hexadecimal number preceded by 0x

(see Table D-3), as in the following:

config-register 0x

value

(The virtual conﬁguration register is stored in nonvolatile memory.)

Step 4 Press CTRL-Z to exit the conﬁguration mode. The new value settings will be

saved to memory; however, the new settings do not take effect until the system

software is reloaded by rebooting the router.

Step 5 Enter the show version EXEC command to display the conﬁguration register

value currently in effect and the value that will be used at the next reload. The

value will be displayed on the last line of the screen display as in the following

example:

Configuration register is 0x142 (will be 0x102 at next reload)

Step 6 Reboot the router. The new value takes effect. Conﬁguration register changes take

effect only when the server restarts, for example, when you switch the power OFF

and ON or when you issue a reload command from the console.