HP AdvanceStack Internet Router Changing Configuration Register Settings, Boot Field Boot Process

Troubleshooting

Virtual Configuration Register Settings

Changing Configuration Register Settings

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

1.Enter the enable command and your password to enter privileged mode:

Router> enable

Password:

Router#

2.Enter the configure terminal command at the privileged EXEC prompt (Router#):

Router# configure terminal

3.To set the contents of the configuration register, enter the configuration command config-registervalue, where value is a hexadecimal number preceded by 0x (see table 4-3 and table 4-4):

config-register 0xvalue

(The virtual configuration register is stored in NVRAM.)

Table 4-4.	Explanation of Boot Field (Configuration Register Bits 00 to 03)
Boot Field	Boot Process
0x0	Stops the boot process in the ROM monitor
0x1	Stops the boot process in the boot ROM monitor
0x3–0xF	Specifies a default filename for booting over the network from a TFTP
	server
	Enables boot system commands that override the default filename for
	booting over the network from a TFTP server
0x2	Full boot process, which loads the Cisco IOS image from Flash memory

4.Press Ctrl-Zto exit configuration mode. The new settings will be saved to memory; however, the new settings do not take effect until the system software is reloaded by rebooting the router.

5.To display the configuration register value currently in effect and the value that will be used at the next reload, enter the show version EXEC command. The value displays on the last line of the screen display:

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

Maintenance

4-9