Cisco Systems 12810, 12010, 12410 manual Ciscobootfieldvalue-processorname

Chapter 4 System Startup and Basic System Configuration

Configuring the Software Configuration Register

Depending on the boot field setting, the system ignores boot instructions in the system configuration file and performs one of the following operations:

•When the boot field is set to 0—You must boot the operating system manually by entering the boot command at the ROM monitor prompt (rommon>). You can enter the boot command with or without arguments.

If you enter the boot command:

–Without an argument (that is, without specifying a file or any other boot instructions), the system automatically boots using the default image in the flash memory SIMM on the RP.

–With arguments (that is, by instructing the system to boot from a specific source), you have the following options:

•You can instruct the system to boot from a:

–Specific flash SIMM image (by entering the boot bootflash:filename command)

–Specific image stored on a PCMCIA flash memory card (by entering the boot slot #: imagename command).

–Network TFTP server either by sending broadcast TFTP requests (by entering a boot filename command), or by sending a direct request to a specific network TFTP server (by entering a boot filename ip-addresscommand).

•When the boot field is set to 1—The system automatically boots using the first image found in the onboard flash SIMM on the RP.

•When the boot field is set to a bit pattern other than 0 or 1—The router uses the software configuration register settings to compute the filename of a default system image stored on a network TFTP server. It then uses that system image to boot the router. However, if the configuration file contains boot instructions, the system uses those instructions to boot the system rather than using the filename it computed from the software configuration register settings.

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 following format:

cisco<bootfieldvalue>-<processorname>

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