Cisco 12410 Installation And Configuration Manual page 202

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:
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Cisco 12010, Cisco 12410, and Cisco 12810 Router Installation and Configuration Guide
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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 (
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-address
command).
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>
Chapter 4 System Startup and Basic System Configuration
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