C H A P T E R 4 Performing A Basic Configuration Of The System; Overview Of Software Configuration Register Settings At Startup - Cisco 7500 Series Configuration Manual

Chapter 4 Performing a Basic Configuration of the System
You have the option of proceeding with the setup facility to configure the interfaces, or exit from setup
and use configuration commands to configure global (system-wide) and interface-specific parameters.
You do not have to configure the interfaces immediately; however, you cannot enable the interfaces or
connect them to any networks until you have configured them.
Many of the interface processor LEDs will not go on until you have configured the interfaces. To verify
correct operation of each interface, complete the first-time startup procedures and configuration, and
then refer to the LED descriptions in the companion publication Interface Processor Installation and
Configuration Guide to check the status of the interfaces.
If the system does not complete each of these steps, proceed to
7500 Series Router,"

Overview of Software Configuration Register Settings at Startup

Bits 0 through 3 of the software configuration register form the boot field, specified as a binary number.
The factory default configuration register setting for systems is 0x102; for RSP spares the default is
0x101.
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:
•
•
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 by sending a direct TFTP request to a specific server (using the boot system filename address
command).
You can also use the boot command to boot images stored in the PC Card Flash memory cards in the
RSP. 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.
The system uses the filename to invoke the system image by booting over the net. However, if the
configuration file contains any boot instructions, the system uses those boot instructions instead of the
filename it computed from the configuration register settings. You must set the boot field for the boot
functions you require.
For more detailed information on the software configuration register features, see the next section,
"Configuring the Software Configuration
see the
OL-5008-03 B0
for troubleshooting recommendations and procedures.
When the boot field is set to 1 (the factory default), the system boots the first image in the onboard
bootflash single in-line memory module (SIMM).
When the boot field is set to 0, you must boot the operating system manually by giving a boot
command to the system bootstrap program, or ROM monitor.
"Booting the Cisco 7500 Series Router for the First Time" section on page

Overview of Software Configuration Register Settings at Startup

Chapter 8, "Troubleshooting a Cisco
Register." For information on the boot command and function,
Cisco 7500 Series Installation and Configuration Guide
4-8.
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