Cisco Catalyst 3750 Metro Command Reference Manual page 823

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Catalyst 3750 Metro Switch Boot Loader Commands

Use the unset boot loader command to reset one or more environment variables.

Under normal circumstances, it is not necessary to alter the setting of the environment variables.

Syntax Description

Command Modes

Command History

unset variable ...

Use one of these keywords for variable:

MANUAL_BOOT—Determines whether the switch automatically or

manually boots.

BOOT—Resets the 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.

ENABLE_BREAK—Determines whether the automatic boot process can

be interrupted by using the Break key on the console after the flash file

system has been initialized.

HELPER—A semicolon-separated list of loadable files to dynamically load

during the boot loader initialization. Helper files extend or patch the

functionality of the boot loader.

PS1—A string that is used as the command-line prompt in boot loader mode.

CONFIG_FILE—Resets the filename that the software uses to read and

write a nonvolatile copy of the system configuration.

BAUD—Resets the rate in bits per second (bps) used for the console. The

software inherits the baud rate setting from the boot loader and continues to

use this value unless the configuration file specifies another setting.

HELPER_CONFIG_FILE—Resets the name of the configuration file to be

used by the helper image. If this is not set, the file specified by the

CONFIG_FILE environment variable is used by all versions of the software

that are loaded, including the helper image. This variable is used only for

internal development and testing.

Modification

This command was introduced.

Catalyst 3750 Metro Switch Command Reference