Cisco Catalyst 3550 Command Reference Manual page 715

Appendix A Catalyst 3550 Switch Boot Loader Commands
Defaults
The environment variables have these default values:
MANUAL_BOOT: No (0)
BOOT: Null string
ENABLE_BREAK: No (Off or 0) (the automatic boot process cannot be interrupted by pressing the
Break key on the console).
HELPER: No default value (helper files are not automatically loaded).
PS1: switch:
CONFIG_FILE: config.text
CONFIG_BUFSIZE: 32 KB
BAUD: 9600 bps
BOOTHLPR: No default value (no helper images are specified).
HELPER_CONFIG_FILE: No default value (no helper configuration file is specified).
Environment variables that have values are stored in the flash file system in various files. The format of
Note
these files is that each line contains an environment variable name and an equal sign followed by the
value of the variable. A variable has no value if it is not listed in this file; it has a value if it is listed in
the file even if the value is a null string. A variable that is set to a null string (for example, " ") is a
variable with a value. Many environment variables are predefined and have default values.
Command Modes
Boot loader
Command History Release
12.1(4)EA1
Usage Guidelines Environment variables are case sensitive and must be entered as documented.
Environment variables that have values are stored in flash memory outside of the flash file system.
Under normal circumstances, it is not necessary to alter the setting of the environment variables.
The MANUAL_BOOT environment variable can also be set by using the boot manual global
configuration command.
OL-8566-02
BOOTHLPR filesystem:/file-url—The name of the Cisco IOS helper image that is
first loaded into memory so that it can then load a second Cisco IOS image into
memory and launch it. This variable is used only for internal development and testing.
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.
Modification
This command was introduced.
Catalyst 3550 Multilayer Switch Command Reference
set
A-21