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Caution To avoid confusion and possibly halting the Cisco 12000 Series Router, remember that valid configuration register settings might be combinations of settings and not just the individual settings listed in Table 9. For example, the factory default value of 0x2102 is a combination of settings. 30 Implementing Additional Configuration and Maintenance Tasks 78-4339-09 Implementing Additional Configuration and Maintenance Tasks Table 9 Software Configuration Register Bit Descriptions Bit 1 Hexadecimal Description 00 to 03 0x0000 to 0x000F Boot field (see Table 10) 06 0x0040 System software ignores NVRAM contents 07 0x0080 OEM2 bit enabled 08 0x0100 Break disabled 09 0x0200 Use secondary bootstrap 10 0x0400 IP3 broadcast with all zeros 11 to 12 0x0800 to 0x1000 Console line speed (default is 9600 baud) 13 0x2000 Boot default Flash software if network boot fails 14 0x4000 IP broadcasts without network numbers 15 0x8000 Enable diagnostic messages and ignore NVRAM contents 1. The factory default value for the configuration register is 0x2102. This value is a combination of the following: binary bit 8 = 0x0100 and binary bits 00 through 03 = 0x0002 (see Table 10). 2. OEM = original equipment manufacturer 3. IP = Internet Protocol Table 10 Boot Field Descriptions (Configuration Register Bits 00 to 03) Boot Field Description 00 Stays at the system bootstrap prompt. 01 Boots the first system image in onboard Flash memory. 02 to 0F Specifies a default filename for booting over the network. Enables boot system commands that override the default filename. Boot Field Settings and the boot Command Bits 0 through 3 of the software configuration register form the boot field, specified as a binary number. Note The factory default configuration register setting for systems and GRP spares is 0x2102. Boot field—When the boot field is set to either 0 or 1 (0-0-0-0 or 0-0-0-1), the system ignores any boot instructions in the system configuration file and the following occurs: • When the boot field is set to 0, you must boot the operating system manually by using the boot command to the system bootstrap program, or rom monitor. or • When the boot field is set to 1, the system boots the first image in the onboard bootflash single in-line memory module (SIMM). 78-4339-09 Configuring the Software Configuration Register 31 Implementing Additional Configuration and Maintenance Tasks You can enter the boot command only, or include additional boot instructions with the command such as the name of a file stored in Flash memory or a file that you specify for booting from a network server. If you use the boot command without specifying a file or any other boot instructions, the system boots from the default Flash image (the first image in onboard Flash memory). Otherwise, you can instruct the system to boot from a specific Flash image (using the boot system flash filename command), or boot from a network server by sending broadcast TFTP requests (using the boot system filename command), or send a direct TFTP request to a specific server (using the boot system filename ip-address command). You can also use the boot command to boot images stored in the Personal Computer Memory Card International Association (PCMCIA) Flash memory cards or Flash disks located in PCMCIA slot 0 or slot 1 on the GRP. If you set the boot field to any bit pattern other than 0 or 1, the system uses the resulting number to form a filename for booting over the network. To form this filename, the system starts with cisco and links the octal equivalent of the boot field value and the processor type in the format cisco
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