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Cisco ME 3800X and ME 3600X Switch Command Reference

OL-23401-02

APPENDIX

Cisco ME 3800X and ME 3600X 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.

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