Configuring The Boot Field - Cisco 2691 - VPN Bundle Router Hardware Installation Manual

Appendix C Configuration Register
Router> enable
Password: password
Step 6
At the privileged EXEC prompt (
Router# configure terminal
Enter configuration commands, one per line.
Edit with DELETE, CTRL/W, and CTRL/U; end with CTRL/Z
Step 7
Enter the config-register value command, where value is a hexadecimal number preceded by 0x (see
Table
Router# config-register 0x value
Note
Step 8
Press Ctrl-z to exit configuration mode.
Step 9
Copy the new console speed to NVRAM:
Router> copy run start
The new settings are saved to NVRAM, but they are not effective until the router restarts; for example,
when you switch the power off and on or when you enter a reload command from the console.
Step 10
Enter the show version command to display the configuration register value currently in effect and the
value that will be used at the next reload. The value is shown on the last line of the display:
Configuration register is 0x142 (will be 0x142 at next reload)
Step 11
Reboot the router. The new value is effective after the router reboots.

Configuring the Boot Field

The lowest four bits of the configuration register (bits 3, 2, 1, and 0) form the boot field. (See
Table C-2
Boot Field
00
01
02-F
OL-2171-06
C-2), to set the contents of the configuration register:
Cisco IOS software does not allow you to change the console speed bits directly with the
config-register command. To change the console speed, complete this sequence:
Router# configure terminal
Router(config)# line console 0
Router(config-line)# speed 9600
Explanation of Boot Field Configuration Register Bits (00-03)
Meaning
Stays at the ROM monitor on a reload or power cycle
Boots the first image in flash memory as a system image
Enables default booting from flash memory
Enables boot system commands that override default booting from flash memory
), enter the configure terminal command:
Router#
Cisco 2600 Series Routers Hardware Installation Guide

Configuring the Boot Field

Table C-2.)
C-3