Performing Other Configuration Tasks
Cisco 12008 Gigabit Switch Router Installation and Configuration Guide
4-34
•Force an automatic boot using a boot image.
When you first power on the router, a boot image called the RP ROM monitor is
executed, resulting in the display of the ROM monitor prompt (rommon>). At this
prompt, you have access to a limited set of commands that enable you to set values in
the software configuration register and to perform a number of other tasks.
The RP ROM monitor is loaded into the RP Flash ROM during board manufacture. You
can use it to boot the system from local Flash memory devices; the RP ROM monitor
software can be upgraded in the field, if necessary.
•Read boot system commands from the configuration file stored in NVRAM.
Table4-3 defines the bits in the software configuration register. The factory default
value for the software configuration register is 0x0102. This value is a combination of
the following: binary bit 8 = 0x0100 and binary bits 00 through 03 = 0x0002 (see
Table4-3).
Caution To avoid confusion, note that valid soft ware config uration registe r values may be
combinations of settings, rather than the individual settings listed in Table4-3. For
example, the factory default value 0x0102 for the software configuration register is actually
a composite of settings in this register.
Table4-3 Definition of Bits in the Software Configuration Register
Bit Number Hexadecimal Value Meaning/Function
00 through 03 0x0000 to 0x000F Comprises the boot field for defining the source of
a default Cisco IOS software image required to run
the router (see Table4-4).
06 0x0040 Causes system software to ignore the contents of
NVRAM.
07 0x0080 The OEM1 bit is enabled.
08 0x0100 The Break function is disabled.
09 0x0200 Use a secondary bootstrap.
10 0x0400 Internet Protocol (IP) broadcast with all zeros.