A-20
Catalyst 3750 Switch Command Reference
OL-8552-07
Appendix A Catalyst 3750 Switch Bootloader Commands
set
set
Use the set bootloader command to set or display environment variables, which can be used to control
the bootloader or any other software running on the switch.
set variable value
Syntax Description variable value Use one of these keywords for variable and value:
MANUAL_BOOT—Decides whether the switch automatically or manually boots
up.
Valid values are 1, yes, 0, and no. If it is set to no or 0, the bootloader attempts to
automatically boot up the system. If it is set to anything else, you must manually
boot up the switch from the bootloader mode.
BOOT filesystem:/file-url—A semicolon-separated list of executable files to try to
load and execute when automatically booting up.
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 up the first bootable file that it can find in the
flash file system.
ENABLE_BREAK—Decides whether the automatic bootup process can be
interrupted by using the Break key on the console.
Valid values are 1, yes, on, 0, no, and off. If it is set to 1, yes, or on, you can interrupt
the automatic bootup process by pressing the Break key on the console after the flash
file system has initialized.
HELPER filesystem:/file-url—A semicolon-separated list of loadable files to
dynamically load during the bootloader initialization. Helper files extend or patch
the functionality of the bootloader.
PS1 prompt—A string that is used as the command-line prompt in bootloader mode.
CONFIG_FILE flash:/file-url—The filename that Cisco IOS uses to read and write
a nonvolatile copy of the system configuration.
BAUD rate—The rate in bits per second (bps) used for the console. The Cisco IOS
software inherits the baud rate setting from the bootloader and continues to use this
value unless the configuration file specifies another setting. The range is from 0 to
4294967295 bps. Valid values are 50, 75, 110, 150, 300, 600, 1200, 1800, 2000,
2400, 3600, 4800, 7200, 9600, 14400, 19200, 28800, 38400, 56000, 57600, 115200,
and 128000.
The most commonly used values are 300, 1200, 2400, 9600, 19200, 57600, and
115200.
HELPER_CONFIG_FILE filesystem:/file-url—The name of the configuration file
to be used by the Cisco IOS helper image. If this is not set, the file specified by the
CONFIG_FILE environment variable is used by all versions of Cisco IOS that are
loaded, including the helper image. This variable is used only for internal
development and testing.
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