Cisco Gigabit Switch Router 12008 Installation And Configuration Manual page 218

Performing Other Configuration Tasks
•
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 (
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.
Table 4-3 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
Table 4-3).
Caution
combinations of settings, rather than the individual settings listed in Table 4-3. For
example, the factory default value 0x0102 for the software configuration register is actually
a composite of settings in this register.
Table 4-3
Bit Number
00 through 03
06
07
08
09
10
4-34
Cisco 12008 Gigabit Switch Router Installation and Configuration Guide
To avoid confusion, note that valid software configuration register values may be
Definition of Bits in the Software Configuration Register
Hexadecimal Value
0x0000 to 0x000F
0x0040
0x0080
0x0100
0x0200
0x0400
Meaning/Function
Comprises the boot field for defining the source of
a default Cisco IOS software image required to run
the router (see Table 4-4).
Causes system software to ignore the contents of
NVRAM.
1
The OEM bit is enabled.
The Break function is disabled.
Use a secondary bootstrap.
Internet Protocol (IP) broadcast with all zeros.
). At this
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