Cisco Catalyst 3560X-24P Command Reference Manual page 1006

Cisco ios release 12.2(55)se

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Table of Contents

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

Syntax Description

Command Modes

Command History

Catalyst 3750-X and 3560-X Switch Command Reference

unset variable ...

Use one of these keywords for variable:

MANUAL_BOOT—Decides whether the switch automatically or manually

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—Decides 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 Cisco IOS uses to read and write

a nonvolatile copy of the system configuration.

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

Cisco IOS software inherits the baud rate setting from the boot loader and

continues to use this value unless the configuration file specifies another

HELPER_CONFIG_FILE—Resets 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.

Modification

This command was introduced.

Catalyst 3750-X and 3560-X Switch Boot Loader Commands