Config-Register is basically a hexadecimal or decimal value that represents
the 16-bit configuration register value that will be used the next time the switch is
restarted. The value range is from 0x0 to 0xFFFF (0 to 65535 in decimal).
The lowest four bits of the configuration register (bits 3, 2, 1, and 0) form the boot
field. The boot field determines if the router boots manually, from ROM, or from Flash or
the network.
About the values:
· If you set the configuration register boot field value to 0x0, you must boot the
operating system manually with the boot command.
· If you set the configuration register boot field value to 0x1, the router boots using
the default ROM software.
· If you set the configuration register boot field to any value from 0x2 to 0xF, the
router uses the boot field value to form a default boot filename for booting from a
network server.
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat4000/12_1_13/config/supcfg.htm#1021
99
Or
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat4000/12_2_31s/conf/supcfg.htm#wp101
89900
Stays at the system bootstrap prompt (does not auto boot).
01
Boots the first system image in onboard Flash memory.
02 to 0F
Auto boots using image(s) specified by the BOOT environment variable. If more than one
image is specified, the switch attempts to boot the first image specified in the BOOT
variable. As long as the switch can successfully boot from this image, the same image will
be used on a reboot. If the switch fails to boot from the image specified in the BOOT
variable, the switch will try to boot from the next image listed in the BOOT variable. If
the end of the BOOT variable is reached without the switch booting successfully, the
switch attempts the boot from the beginning of the BOOT variable. The auto boot continues
until the switch successfully boots from one of the images specified in the BOOT variable.
