Cisco ME 3800X, ME 3600X ME 3600X-24CX Switch Command Reference, Release 15.3(3)S

arp
boot
cat
copy
delete
dir
flash_init
format
fsck
help
memory
mgmt_clr
mgmt_init
mgmt_show
mkdir
more
peek
ping
poke
rename
reset
rmdir
set
set_param
sleep
type
unset
version

Cisco ME 3800X, ME 3600X, and ME 3600X-24CX Switch
Boot Loader Commands

This appendix describes the boot loader commands on the Cisco ME 3800X and ME 3600X switch. During normal boot loader operation, you are not presented with the boot loader command-line prompt. You gain access to the boot loader command line if the switch is set to manually boot, if an error occurs during power-on self-test (POST) DRAM testing, or if an error occurs while loading the operating system (a corrupted Cisco IOS image). You can also access the boot loader if you have lost or forgotten the switch password.

Note The default switch configuration allows an end user with physical access to the switch to recover from a lost password by interrupting the boot process while the switch is powering up and then entering a new password. The password recovery disable feature allows the system administrator to protect access to the switch password by disabling part of this functionality and allowing the user to interrupt the boot process only by agreeing to set the system back to the default configuration. With password recovery disabled, the user can still interrupt the boot process and change the password, but the configuration file (config.text) and the VLAN database file (vlan.dat) are deleted. For more information, see the software configuration guide for this release.

You can access the boot loader through a switch console connection at 9600 bps. Disconnect and then reconnect the switch power cord. After the switch performs POST, the switch begins the autoboot process. The boot loader prompts the user for a break key character during the boot-up sequence, as shown in this example:

***** The system will autoboot in 5 seconds *****

Send "break character" to prevent autobooting.

The break key character is different for each operating system.

•On a SUN work station running UNIX, Ctrl-C is the break key.

•On a PC running Windows 2000, Ctrl-Break is the break key.

Cisco TAC has tabulated break keys for most common operating systems and has provided an alternative break key sequence for terminal emulators that do not support the break keys. To view this table, see:

http://www.cisco.com/en/US/products/hw/routers/ps133/products_tech_note09186a0080174a34.shtml

When you enter the break key, the boot loader switch: prompt appears.

The boot loader performs low-level CPU initialization, performs POST, and loads a default operating system image into memory.

arp

To display the contents the Address Resolution Protocol (ARP) table, use the arp command in boot loader mode.

arp [ip_address]

Syntax Description


ip_address	(Optional) Show the ARP table or the mapping for a specific IP address.

Command Modes

Boot loader

Command History


Release	Modification
12.2(52)EY	This command was introduced.

Usage Guidelines

The ARP table has the IP-address-to-MAC-address mappings.

Examples

This example shows how to display the ARP table:

Switch: arp 172.20.136.8

arp'ing 172.20.136.8...

172.20.136.8 is at 00:1b:78:d1:25:ae, via port 0

boot

To load and boot an executable image and to enter the command-line interface, use the boot command in boot loader mode.

boot [-post | -n | -p | flag] filesystem:/file-url ...

Syntax Description


-post	(Optional) Runs the loaded image with an extended or comprehensive power-on self-test (POST). Using this keyword causes POST to take longer to complete.
-n	(Optional) Pauses for the Cisco IOS debugger immediately after launching.
-p	(Optional) Pauses for the JTAG debugger right after loading the image.
filesystem:	Alias for a flash file system. Use flash: for the system board flash device.
/file-url	(Optional) Path (directory) and name of a bootable image. Separate image names with a semicolon.

Defaults

The switch attempts to automatically boot the system by using information in the BOOT environment variable. If this variable is not set, the switch attempts to load and execute the first executable image it can by performing a recursive, depth-first search throughout the flash file system. In a depth-first search of a directory, each encountered subdirectory is completely searched before continuing the search in the original directory.

Command Modes

Boot loader

Command History


Release	Modification
12.2(52)EY	This command was introduced.

Usage Guidelines

When you enter the boot command without any arguments, the switch attempts to automatically boot the system by using the information in the BOOT environment variable, if any. If you supply an image name for the file-url variable, the boot command attempts to boot the specified image.

When you set boot loader boot command options, they are executed immediately and apply only to the current boot loader session. These settings are not saved for the next boot operation.

Filenames and directory names are case sensitive.

Examples

This example shows how to boot the switch using the new-image.bin image:

Switch: boot flash:/new-images/new-image.bin

After entering this command, you are prompted to start the setup program.

Related Commands


Command	Description
set	Sets the BOOT environment variable to boot a specific image when the BOOT keyword is appended to the command.

cat

To display the contents of one or more files, use the cat command in boot loader mode.

cat filesystem:/file-url ...

Syntax Description


filesystem:	Alias for a flash file system. Use flash: for the system board flash device.
/file-url	Path (directory) and name of the files to display. Separate each filename with a space.

Command Modes

Boot loader

Command History


Release	Modification
12.2(52)EY	This command was introduced.

Usage Guidelines

Filenames and directory names are case sensitive.

If you specify a list of files, the contents of each file appears sequentially.

Examples

This example shows how to display the contents of two files:

Switch: cat flash:/new-images/info flash:env_vars

version_suffix: image-name

version_directory: image-name

image_name: image-name.bin

ios_image_file_size: 63984644

total_image_file_size: 8133632

image_feature: IP|LAYER_3|PLUS|MIN_DRAM_MEG=128

image_family: me340x

info_end:

BAUD=57600

MANUAL_BOOT=no

Related Commands


Command	Description
more	Displays the contents of one or more files.
type	Displays the contents of one or more files.

copy

To copy a file from a source to a destination, use the copy command in boot loader mode.

copy [-b block-size] filesystem:/source-file-url filesystem:/destination-file-url

Syntax Description


-b block-size	(Optional) This option is used only for internal development and testing.
filesystem:	Alias for a flash file system. Use flash: for the system board flash device.
/source-file-url	Path (directory) and filename (source) to be copied.
/destination-file-url	Path (directory) and filename of the destination.

Defaults

The default block size is 4 KB.

Command Modes

Boot loader

Command History


Release	Modification
12.2(52)EY	This command was introduced.

Usage Guidelines

Filenames and directory names are case sensitive.

Directory names are limited to 45 characters between the slashes (/); the name cannot contain control characters, spaces, deletes, slashes, quotes, semicolons, or colons.

Filenames are limited to 45 characters; the name cannot contain control characters, spaces, deletes, slashes, quotes, semicolons, or colons.

If you are copying a file to a new directory, the directory must already exist.

Examples

This example show how to copy a file at the root:

Switch: copy flash:test1.text flash:test4.text

File "flash:test1.text" successfully copied to "flash:test4.text"

You can verify that the file was copied by entering the dir filesystem: boot loader command.

Related Commands


Command	Description
delete	Deletes one or more files from the specified file system.

delete

To delete one or more files from the specified file system, use the delete command in boot loader mode.

delete filesystem:/file-url ...

Syntax Description


filesystem:	Alias for a flash file system. Use flash: for the system board flash device.
/file-url	Path (directory) and filename to delete. Separate each filename with a space.

Command Modes

Boot loader

Command History


Release	Modification
12.2(52)EY	This command was introduced.

Usage Guidelines

Filenames and directory names are case sensitive.

The switch prompts you for confirmation before deleting each file.

Examples

This example shows how to delete two files:

Switch: delete flash:test2.text flash:test5.text

Are you sure you want to delete "flash:test2.text" (y/n)?y

File "flash:test2.text" deleted

Are you sure you want to delete "flash:test5.text" (y/n)?y

File "flash:test2.text" deleted

You can verify that the files were deleted by entering the dir flash: boot loader command.

Related Commands


Command	Description
copy	Copies a file from a source to a destination.

dir

To display a list of files and directories on the specified file system, use the dir command in boot loader mode.

dir filesystem:/file-url ...

Syntax Description


filesystem:	Alias for a flash file system. Use flash: for the system board flash device.
/file-url	(Optional) Path (directory) and directory name whose contents you want to display. Separate each directory name with a space.

Command Modes

Boot loader

Command History


Release	Modification
12.2(52)EY	This command was introduced.

Usage Guidelines

Directory names are case sensitive.

Examples

This example shows how to display the files in flash memory:

Switch: dir flash:

Directory of flash:/

    3  -rwx        1839   Mar 01 2002 00:48:15  config.text

   11  -rwx        1140   Mar 01 2002 04:18:48  vlan.dat

   21  -rwx          26   Mar 01 2002 00:01:39  env_vars

    9  drwx         768   Mar 01 2002 23:11:42  html

   16  -rwx        1037   Mar 01 2002 00:01:11  config.text

   14  -rwx        1099   Mar 01 2002 01:14:05  homepage.htm

   22  -rwx          96   Mar 01 2002 00:01:39  system_env_vars

   17  drwx        192    Mar 06 2002 23:22:03  image-name

15998976 bytes total (6397440 bytes free)

Table A-1 describes the fields in the display.

Table A-1 dir Field Descriptions
Field	Description
2	Index number of the file.
-rwx	File permission, which can be any or all of these: •d—directory •r—readable •w—writable •x—executable
1644045	Size of the file.
<date>	Last modification date.
env_vars	Filename.

Related Commands


Command	Description
mkdir	Creates one or more directories.
rmdir	Removes one or more directories.

flash_init

To initialize the flash file system, use the flash_init command in boot loader mode.

flash_init

Syntax Description

This command has no arguments or keywords.

Defaults

The flash file system is automatically initialized during normal system operation.

Command Modes

Boot loader

Command History


Release	Modification
12.2(52)EY	This command was introduced.

Usage Guidelines

During the normal boot process, the flash file system is automatically initialized.

Use this command to manually initialize the flash file system. For example, you use this command during the recovery procedure for a lost or forgotten password.

format

To format the specified file system and destroy all data in that file system, use the format command in boot loader mode.

format filesystem:

Syntax Description


filesystem:	Alias for a flash file system. Use flash: for the system board flash device.

Command Modes

Boot loader

Command History


Release	Modification
12.2(52)EY	This command was introduced.

Usage Guidelines

Caution

Use this command with care; it destroys all data on the file system and renders your system unusable.

fsck

To check the file system for consistency, use the fsck command in boot loader mode.

fsck [-test | -f] filesystem:

Syntax Description


-test	(Optional) Initializes the file system code and perform extra POST on flash memory. An extensive, nondestructive memory test is performed on every byte that makes up the file system.
-f	(Optional) Initializes the file system code and perform a fast file consistency check. Cyclic redundancy checks (CRCs) in the flashfs sectors are not checked.
filesystem:	Alias for a flash file system. Use flash: for the system board flash device.

Defaults

No file system check is performed.

Command Modes

Boot loader

Command History


Release	Modification
12.2(52)EY	This command was introduced.

Usage Guidelines

To stop an in-progress file system consistency check, disconnect the switch power and then reconnect the power.

Examples

This example shows how to perform an extensive file system check on flash memory:

Switch: fsck -test flash:

help

To display the available commands, use the help command in boot loader mode.

help

Syntax Description

This command has no arguments or keywords.

Command Modes

Boot loader

Command History


Release	Modification
12.2(52)EY	This command was introduced.

Usage Guidelines

You can also use the question mark (?) to display a list of available boot loader commands.

memory

To display memory heap utilization information, use the memory command in boot loader mode.

memory

Syntax Description

This command has no arguments or keywords.

Command Modes

Boot loader

Command History


Release	Modification
12.2(52)EY	This command was introduced.

Examples

This example shows how to display memory heap utilization information:

Switch: memory

Text:   0x00700000 - 0x0071cf24 (0x0001cf24 bytes)

Rotext: 0x00000000 - 0x00000000 (0x00000000 bytes)

Data:   0x0071cf24 - 0x00723a0c (0x00006ae8 bytes)

Bss:    0x0072529c - 0x00746f94 (0x00021cf8 bytes)

Heap:   0x00756f98 - 0x00800000 (0x000a9068 bytes)

Bottom heap utilization is 22 percent.

Top heap utilization is 0 percent.

Total heap utilization is 22 percent.

Total bytes: 0xa9068 (692328)

Bytes used: 0x26888 (157832)

Bytes available: 0x827e0 (534496)

Alternate heap utilization is 0 percent.

Total alternate heap bytes: 0x6fd000 (7327744)

Alternate heap bytes used: 0x0 (0)

Alternate heap bytes available: 0x6fd000 (7327744)

Table A-2 describes the fields in the display.

Table A-2 memory Field Descriptions
Field	Description
Text	Beginning and ending address of the text storage area.
Rotext	Beginning and ending address of the read-only text storage area. This part of the data segment is grouped with the Text entry.
Data	Beginning and ending address of the data segment storage area.
Bss	Beginning and ending address of the block started by symbol (Bss) storage area. It is initialized to zero.
Heap	Beginning and ending address of the area in memory that memory is dynamically allocated to and freed from.

mgmt_clr

To clear the Ethernet management port statistics, use the mgmt_clr command in boot loader mode.

mgmt_clr

Syntax Description

This command has no arguments or keywords.

Command Modes

Boot loader

Command History


Release	Modification
12.2(52)EY	This command was introduced.

Examples

This example shows how to clear the Ethernet management port statistics:

Switch: mgmt_clr

mgmt_init

To initialize the Ethernet management port, use the mgmt_init command in boot loader mode.

mgmt_init

Syntax Description

This command has no arguments or keywords.

Command Modes

Boot loader

Command History


Release	Modification
12.2(52)EY	This command was introduced.

Usage Guidelines

Use the mgmt_init command only during debugging of the Ethernet management port.

Examples

This example shows how to initialize the Ethernet management port:

Switch: mgmt_init

mgmt_show

To display the Ethernet management port statistics, use the mgmt_show command in boot loader mode.

mgmt_show

Syntax Description

This command has no arguments or keywords.

Command Modes

Boot loader

Command History


Release	Modification
12.2(52)EY	This command was introduced.

Examples

This example shows how to display the Ethernet management port statistics:

Switch: mgmt_show

Statistics                Received    Transmitted

---------------------------------------------------

good frame bytes      :         60            120

good frames           :          1              2

bad frames            :          0              0

dropped frames        :          0              0

queue overflowed      :          0              0

memory access errors  :          0              0

mkdir

To create one or more new directories on the specified file system, use the mkdir command in boot loader mode.

mkdir filesystem:/directory-url ...

Syntax Description


filesystem:	Alias for a flash file system. Use flash: for the system board flash device.
/directory-url	Name of the directories to create. Separate each directory name with a space.

Command Modes

Boot loader

Command History


Release	Modification
12.2(52)EY	This command was introduced.

Usage Guidelines

Directory names are case sensitive.

Directory names are limited to 45 characters between the slashes (/); the name cannot contain control characters, spaces, deletes, slashes, quotes, semicolons, or colons.

Examples

This example shows how to make a directory called Saved_Configs:

Switch: mkdir flash:Saved_Configs

Directory "flash:Saved_Configs" created

This example shows how to make two directories:

Switch: mkdir flash:Saved_Configs1 flash:Test

Directory "flash:Saved_Configs1" created

Directory "flash:Test" created

You can verify that the directory was created by entering the dir filesystem: boot loader command.

Related Commands


Command	Description
dir	Displays a list of files and directories on the specified file system.
rmdir	Removes one or more directories from the specified file system.

To display the contents of one or more files, use the more command in boot loader mode.

more filesystem:/file-url ...

Syntax Description


filesystem:	Alias for a flash file system. Use flash: for the system board flash device.
/file-url	Path (directory) and name of the files to display. Separate each filename with a space.

Command Modes

Boot loader

Command History


Release	Modification
12.2(52)EY	This command was introduced.

Usage Guidelines

Filenames and directory names are case sensitive.

If you specify a list of files, the contents of each file appears sequentially.

Examples

This example shows how to display the contents of two files:

Switch: more flash:/new-images/info flash:env_vars

version_suffix: image-name

version_directory: image-name

image_name: image-name.bin

ios_image_file_size: 63984644

total_image_file_size: 8133632

image_feature: IP|LAYER_3|PLUS|MIN_DRAM_MEG=128

image_family: family

info_end:

BAUD=57600

MANUAL_BOOT=no

Related Commands


Command	Description
cat	Displays the contents of one or more files.
type	Displays the contents of one or more files.

peek

To read data from a memory location, use the peek command in boot loader mode.

peek location

Syntax Description


location	32-bit memory location.

Command Modes

Boot loader

Command History


Release	Modification
12.2(52)EY	This command was introduced.

Examples

This example shows how to read data from a memory location:

Switch: peek 0xfff80000

ox4BE000=102

ping

To send ICMP ECHO REQUEST packets to a network host, use the ping command in boot loader mode.

ping ip-address

Syntax Description


ip-address	The IP address of the network host.

Command Modes

Boot loader

Command History


Release	Modification
12.2(52)EY	This command was introduced.

Examples

This example shows how to send an echo request packet to a network host:

Switch: ping 1.1.1.1 255.255.255.0

poke

To write data to one writable memory location, use the poke command in boot loader mode.

poke location

Syntax Description


location	32-bit memory location.

Command Modes

Boot loader

Command History


Release	Modification
12.2(52)EY	This command was introduced.

Examples

This example shows how to write data to a writeable memory location:

Switch: poke 0xfff80000

ox4BE000=102

rename

To rename a file, use the rename command in boot loader mode.

rename filesystem:/source-file-url filesystem:/destination-file-url

Syntax Description


filesystem:	Alias for a flash file system. Use flash: for the system board flash device.
/source-file-url	Original path (directory) and filename.
/destination-file-url	New path (directory) and filename.

Command Modes

Boot loader

Command History


Release	Modification
12.2(52)EY	This command was introduced.

Usage Guidelines

Filenames and directory names are case sensitive.

Directory names are limited to 45 characters between the slashes (/); the name cannot contain control characters, spaces, deletes, slashes, quotes, semicolons, or colons.

Filenames are limited to 45 characters; the name cannot contain control characters, spaces, deletes, slashes, quotes, semicolons, or colons.

Examples

This example shows a file named config.text being renamed to config1.text:

Switch: rename flash:config.text flash:config1.text

You can verify that the file was renamed by entering the dir filesystem: boot loader command.

Related Commands


Command	Description
copy	Copies a file from a source to a destination.

reset

To perform a hard reset on the system, use the reset command in boot loader mode. A hard reset is similar to power-cycling the switch, clearing the processor, registers, and memory.

reset

Syntax Description

This command has no arguments or keywords.

Command Modes

Boot loader

Command History


Release	Modification
12.2(52)EY	This command was introduced.

Examples

This example shows how to reset the system:

Switch: reset

Are you sure you want to reset the system (y/n)?y

System resetting...

Related Commands


Command	Description
boot	Loads and boots an executable image and enters the command-line interface.

rmdir

To remove one or more empty directories from the specified file system, use the rmdir command in boot loader mode.

rmdir filesystem:/directory-url ...

Syntax Description


filesystem:	Alias for a flash file system. Use flash: for the system board flash device.
/directory-url	Path (directory) and name of the empty directories to remove. Separate each directory name with a space.

Command Modes

Boot loader

Command History


Release	Modification
12.2(52)EY	This command was introduced.

Usage Guidelines

Directory names are case sensitive and limited to 45 characters between the slashes (/); the name cannot contain control characters, spaces, deletes, slashes, quotes, semicolons, or colons.

Before removing a directory, you must first delete all the files in the directory.

The switch prompts you for confirmation before deleting each directory.

Examples

This example shows how to remove a directory:

Switch: rmdir flash:Test

You can verify that the directory was deleted by entering the dir filesystem: boot loader command.

Related Commands


Command	Description
dir	Displays a list of files and directories on the specified file system.
mkdir	Creates one or more new directories on the specified file system.

set

To set or display environmental variables that can be used to control the boot loader or any other software running on the switch, use the set command in boot loader mode.

set variable value

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

Syntax Description


variable value	Use one of these keywords for variable and value: MANUAL_BOOT—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 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.
	ENABLE_BREAK—Decides whether the automatic boot 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 boot 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 boot loader initialization. Helper files extend or patch the functionality of the boot loader.
	PS1 prompt—A string that is used as the command-line prompt in boot loader 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 boot loader 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.

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

BAUD: 9600 bps

HELPER_CONFIG_FILE: No default value (no helper configuration file is specified).

SWITCH_NUMBER: 1

SWITCH_PRIORITY: 1

Note Environment variables that have values are stored in the flash file system in various files. The format of 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	Modification
12.2(52)EY	This command was introduced.

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 environmental variables.

The MANUAL_BOOT environment variable can also be set by using the boot manual global configuration command.

The BOOT environment variable can also be set by using the boot system filesystem:/file-url global configuration command.

The ENABLE_BREAK environment variable can also be set by using the boot enable-break global configuration command.

The HELPER environment variable can also be set by using the boot helper filesystem:/file-url global configuration command.

The CONFIG_FILE environment variable can also be set by using the boot config-file flash:/file-url global configuration command.

The HELPER_CONFIG_FILE environment variable can also be set by using the boot helper-config-file filesystem:/file-url global configuration command.

The boot loader prompt string (PS1) can be up to 120 printable characters except the equal sign (=).

Examples

This example shows how to change the boot loader prompt:

Switch: set PS1 loader:

loader:

You can verify your setting by using the set boot loader command.

Related Commands


Command	Description
unset	Resets one or more environment variables to its previous setting.

set_param

To write system parameters to the system flash memory, use the set_param command in boot loader mode.

set_param

Syntax Description

This command has no arguments or keywords.

Command Modes

Boot loader

Command History


Release	Modification
12.2(52)EY	This command was introduced.

Examples

This example shows how to write system parameters to system flash memory.

Switch: set_param

sleep

To pause for a specified number of seconds, use the sleep command in boot loader mode.

sleep value

Syntax Description


value:	Sets the time to pause the boot loader in seconds. The range is 0 to 2³¹-1.

Command Modes

Boot loader

Command History


Release	Modification
12.2(52)EY	This command was introduced.

Examples

This example shows how to pause the boot loader process for 30 seconds:

Switch: sleep 30

type

To display the contents of one or more files, use the type command in boot loader mode.

type filesystem:/file-url ...

Syntax Description


filesystem:	Alias for a flash file system. Use flash: for the system board flash device.
/file-url	Path (directory) and name of the files to display. Separate each filename with a space.

Command Modes

Boot loader

Command History


Release	Modification
12.2(52)EY	This command was introduced.

Usage Guidelines

Filenames and directory names are case sensitive.

If you specify a list of files, the contents of each file appears sequentially.

Examples

This example shows how to display the contents of two files:

Switch: type flash:/new-images/info flash:env_vars

version_suffix: image-name

version_directory: image-name

image_name: image-name.bin

ios_image_file_size: 63984644

total_image_file_size: 8133632

image_feature: IP|LAYER_3|PLUS|MIN_DRAM_MEG=128

image_family: family

info_end:

BAUD=57600

MANUAL_BOOT=no

Related Commands


Command	Description
cat	Displays the contents of one or more files.
more	Displays the contents of one or more files.

unset

To reset one or more environmental variables, use the unset command in boot loader mode.

unset variable ...

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

Syntax Description


variable	Use one of these keywords for variable: MANUAL_BOOT—Decides 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—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 (bps) 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 setting.
	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.

Command Modes

Boot loader

Command History


Release	Modification
12.2(52)EY	This command was introduced.

Usage Guidelines

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

The MANUAL_BOOT environment variable can also be reset by using the no boot manual global configuration command.

The BOOT environment variable can also be reset by using the no boot system global configuration command.

The ENABLE_BREAK environment variable can also be reset by using the no boot enable-break global configuration command.

The HELPER environment variable can also be reset by using the no boot helper global configuration command.

The CONFIG_FILE environment variable can also be reset by using the no boot config-file global configuration command.

The HELPER_CONFIG_FILE environment variable can also be reset by using the no boot helper-config-file global configuration command.

Examples

This example shows how to reset the prompt string to its previous setting:

Switch: unset PS1

Switch:

Related Commands


Command	Description
set	Sets or displays environment variables.

version

To display the boot loader version, use the version command in boot loader mode.

version

Syntax Description

This command has no arguments or keywords.

Command Modes

Boot loader

Command History


Release	Modification
12.2(52)EY	This command was introduced.

Examples

This example shows how to display the boot loader version:

Switch: version

switch-name Boot Loader (xxxxx-HBOOT-M) Version 12.2(xx)EX

Compiled Wed 12-Sept-05 14:58 by devgoyal

Switch:

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Chapter: Boot Loader Commands

Cisco ME 3800X, ME 3600X, and ME 3600X-24CX SwitchBoot Loader Commands

arp

Syntax Description

Command Modes

Command History

Usage Guidelines

Examples

boot

Syntax Description

Defaults

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cat

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copy

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delete

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dir

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flash_init

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format

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fsck

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help

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memory

Syntax Description

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mgmt_clr

Syntax Description

Command Modes

Command History

Cisco ME 3800X, ME 3600X, and ME 3600X-24CX Switch
Boot Loader Commands