Cisco Systems 12410, 12010, 12810 manual Bit Number Hexadecimal Value Meaning/Function

Chapter 4 System Startup and Basic System Configuration

Configuring the Software Configuration Register

•Read boot system commands from the configuration file stored in NVRAM. Table 4-4defines software configuration register bits.

Caution To avoid confusion and possibly halting the system, remember that valid software configuration register values may be combinations of settings, rather than the individual settings listed in Table 4-4. For example, the factory default value for the software configuration register (0x0102) is actually a combination of several settings (binary bit 8 = 0x0100 and binary bits 00 through 03 = 0x0002).

Table 4-4 Software Configuration Register Bits

Bit Number	Hexadecimal Value	Meaning/Function
00 to 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 Table 4-5)
06	0x0040	Causes the system software to ignore
		the contents of NVRAM
07	0x0080	Enables the OEM1 bit
08	0x0100	Disables the break function
09	0x0200	Uses a secondary bootstrap
10	0x0400	Broadcasts Internet Protocol (IP) with
		all zeros
11 and 12	0x0800 to 0x1000	Defines the console baud rate (default
		= 9600 bps)
13	0x2000	Boots the default flash memory
		software if the network boot fails
14	0x4000	Excludes network numbers from
		IP broadcasts
15	0x8000	Enables diagnostic messages and
		ignores the contents of NVRAM

1. OEM = original equipment manufacturer.

	Cisco 12010, Cisco 12410, and Cisco 12810 Router Installation and Configuration Guide
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