3-21
Cisco ME 3800X and 3600X Switch Software Configuration Guide
OL-23400-01
Chapter 3 Assigning the Switch IP Address and Default Gateway
Scheduling a Reload of the Software Image
You can change the settings of the environment variables by accessing the boot loader or by using Cisco
IOS commands. Under normal circumstances, it is not necessary to alter the setting of the environment
variables.
Note
For complete syntax and usage information for the boot loader commands and environment variables,
see the command reference for this release.
Table 3-4
describes the function of the most common environment variables.
Scheduling a Reload of the Software Image
You can schedule a reload of the software image to occur on the switch at a later time (for example, late
at night or during the weekend when the switch is used less), or you can synchronize a reload
network-wide (for example, to perform a software upgrade on all switches in the network).
Note
A scheduled reload must take place within approximately 24 days.
Table 3-4
Environment Variables
Variable
Boot Loader Command
Cisco IOS Global Configuration Command
BOOT
set BOOT filesystem:/file-url ...
A semicolon-separated list of executable files to
try to load and execute when automatically
booting. If the BOOT environment variable is not
set, the system attempts to load and execute the
first executable image it can find by using a
recursive, depth-first search through the flash file
system. If the BOOT variable is set but the
specified images cannot be loaded, the system
attempts to boot the first bootable file that it can
find in the flash file system.
boot system filesystem:/file-url ...
Specifies the Cisco IOS image to load during the
next boot cycle. This command changes the
setting of the BOOT environment variable.
MANUAL_BOOT
set MANUAL_BOOT yes
Decides whether the switch automatically or
manually boots.
Valid values are 1, yes, 0, and no. If it is set to no
or 0, the boot loader attempts to automatically
boot the system. If it is set to anything else, you
must manually boot the switch from the boot
loader mode.
boot manual
Enables manually booting the switch during the
next boot cycle and changes the setting of the
MANUAL_BOOT environment variable.
The next time you reboot the system, the switch is
in boot loader mode. To boot the system, use the
boot flash:filesystem:/file-url boot loader
command, and specify the name of the bootable
image.
CONFIG_FILE
set CONFIG_FILE flash:/file-url
Changes the filename that Cisco IOS uses to read
and write a nonvolatile copy of the system
configuration.
boot config-file flash:/file-url
Specifies the filename that Cisco IOS uses to read
and write a nonvolatile copy of the system
configuration. This command changes the
CONFIG_FILE environment variable.
