Cisco Systems OL-11497-03 manual Bit Number, Boot Field Definition

Chapter 4 Troubleshooting the Installation

		Performing Other Configuration Tasks
Table 4-1	Software Configuration Register Bit Meanings (continued)
Bit Number1	Hexadecimal
	Value	Definition/Function
07	0x0080	Enables the OEM2 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	Defines the console baud rate (the default setting
	0x1000	is 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.The factory default value for the software configuration register is 0x0102. This value is a combination of binary bit 8 = 0x0100 and binary bits 00 through 03 = 0x0002.

2.OEM = original equipment manufacturer.

Table 4-2specifies the content of the boot field, which defines a source for booting the default Cisco IOS software image required to run the router. The content of the boot field is specified as a binary number.

Table 4-2 Boot Field and Meanings

Boot Field Definition

00On power up, the system remains at the ROM monitor prompt

(rommon>) awaiting a user command to boot the system manually.

01On power up, the system automatically boots the first system image found in the onboard Flash memory SIMM on the RP.

	Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide
OL-11497-03		4-3