Cisco Systems OL-11497-03 manual Configuration Register Settings

Chapter 4 Troubleshooting the Installation

Performing Other Configuration Tasks

Note If a bootable Cisco IOS software image exists in a Flash memory card inserted in PCMCIA slot 0 or slot 1, the software configuration register boot field setting is overridden. The system then boots from the Cisco IOS software image in the Flash memory card, rather than from a network TFTP image (that is, from a computed filename in the range from cisco2-grpthrough cisco17-grpor cisco2-prpthrough cisco17-prp).

Configuration Register Settings

To change the software configuration register settings while running system software, follow these steps:

Step 1 Enter the enable command and your password at the user EXEC mode prompt to enter privileged EXEC mode:

Router> enable

Password: <password>

Router#

Step 2 Enter the configure terminal command at the privileged EXEC mode prompt on the system console to enter global configuration mode, as shown in the following example:

Router# configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

Router(config)#

Step 3 Set the contents of the software configuration register by entering the config-registervalue command at the global configuration mode prompt, where value is a hexadecimal number preceded by 0x, as in the following:

Router(config)# config-register 0xvalue

Consult the hexadecimal column in Table 4-1 on page 4-2for the possible settings to enter as the four-bit value parameter.

Step 4 Exit global configuration mode by entering Ctrl-Z.

Router(config)# config-register 0xvalue

Router(config)# Ctrl-Z

Router#

	Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide
4-6	OL-11497-03