Cisco CISCO7201 Installation And Configuration Manual page 140

Boot Environment Variables
Following are explanations for each of these boot environment variables:
BOOT variable—Points to the Cisco IOS software image that you want to boot; you set it in
•
configuration mode. The default software image is the CISCOxxx image (where xxx is a filename
assigned by the system, if you do not enter a specific filename). The system then looks for the first
image on the CompactFlash Disk in slot 0.
Enter configuration mode and specify a filename and the CompactFlash Disk slot from which to boot
using the configure terminal and boot system commands as follows:
Router# configure terminal
Enter configuration commands, one per line. End with CTRL-Z.
System(config)# boot system flash disk0:rsp-p-mz.12-0
The result of this configuration file entry is that the BOOT variable is disk0:
c7200p-kboot-mz.122...bin.
CONFIG_FILE (configuration file) variable—Determines where the configuration is read from on
bootup; you set it in configuration mode as follows:
Router# configure terminal
Enter configuration commands, one per line. End with CTRL-Z.
System(config)# boot config disk0:configfile
The result of this configuration file entry is that the CONFIG_FILE variable is disk0:configfile.
BOOTLDR (boot loader) variable—Determines which image is used as the boot helper (boot
•
image); you set it in configuration mode as follows:
Router# configure terminal
Enter configuration commands, one per line. End with CTRL-Z.
System(config)# boot bootldr bootflash:c7200p-kboot-mz
The result of this configuration file entry is that the BOOTLDR variable is
bootflash:c7200p-kboot-mz.
Configuration register variable—Instructs the system where to look for a bootable Cisco IOS
•
software image; you set it as a hexadecimal value in configuration mode as follows:
Router# configure terminal
Enter configuration commands, one per line. End with CTRL-Z.
System(config)# config-register 0x102
The result of this configuration file entry is that the configuration register is set to hexadecimal
0x102. See
Register Information"
Cisco 7201 Installation and Configuration Guide
B-4
Chapter 3, "Starting and Configuring the Router"
for information about the configuration register.
Appendix B Using the CompactFlash Disk
and Appendix C, "Configuration
OL-11364-04