Setting The Boot Environment Variable - Cisco 4700M Administration Manual

Setting Up the ACE
Command
Step 2
config-register value
Example:
host1/Admin(config)# config-register 0x1
no config-register 0x1
Example:
host1/Admin(config)# no config-register
0x1
Step 3
do copy running-config startup-config
Example:
host1/Admin(config)# do copy
running-config startup-config

Setting the BOOT Environment Variable

This section describes how to add several images to the BOOT environment variable to provide a
fail-safe boot configuration. The BOOT environment variable specifies a list of image files on various
devices from which the ACE can boot at startup. If the first file fails to boot the ACE, subsequent images
that are specified in the BOOT environment variable are tried until the ACE boots or there are no
additional images to attempt to boot. If there is no valid image to boot, the ACE enters ROMMON mode
where you can manually specify an image to boot.
The ACE stores and executes images in the order in which you added them to the BOOT environment
variable. If you want to change the order in which images are tried at startup, you can either prepend and
clear images from the BOOT environment variable to attain the desired order or you can clear the entire
BOOT environment variable and then redefine the list in the desired order.
Cisco 4700 Series Application Control Engine Appliance Administration Guide
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Purpose
The value argument represents the configuration register value
that you want to use the next time that you restart the ACE. The
supported value entries are as follows:
0x0—Upon reboot, the ACE boots to the GNU GRand
•
Unified Bootloader (GRUB). From the GRUB boot loader,
you specify the system boot image to use to boot the ACE.
Upon startup, the ACE loads the startup-configuration file
stored in the Flash memory (nonvolatile memory) to the
running-configuration file stored in RAM (volatile
memory). For information about using the GRUB boot
loader during a reboot, see the
section.
0x1—Upon reboot, the ACE boots the system image
•
identified in the BOOT environment variable (see the
"Setting the BOOT Environment Variable"
BOOT environment variable specifies a list of image files on
various devices from which the ACE can boot at startup. If
the ACE encounters an error or if the image is not valid, it
will try the second image (if one is specified). Upon startup,
the ACE loads the startup-configuration file stored in the
Flash memory (nonvolatile memory) to the
running-configuration file stored in RAM (volatile
memory).
(Optional) Resets the config-register setting.
Copies the running configuration to the startup configuration.
Chapter 1 Setting Up the ACE
"Restarting the ACE"
section). The
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