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Configuration Guide for Cisco DSLAMs with NI-2
OL-2074-03
Chapter 9 Loading System Software Images and Configuration Files
Performing General Startup Tasks
When you load a default system image from a network server, the DSLAM uses the configuration
register settings to determine the default system image filename for booting from a network server. The
default boot filename starts with the string “cisco”, followed by the octal equivalent of the boot field
number in the configuration register, followed by a hyphen (-) and the processor type name (for example,
“cisco nn-cpu”).
Setting the Boot Field
You must correctly set the configuration register boot field to ensure that your DSLAM loads the
operating system image correctly. See Table 9-1 for boot field descriptions.
To set the boot field, follow these steps:
Step 1 Obtain the current configuration register setting, a hexadecimal value.
Step 2 Modify the current configuration register setting to reflect how you want the DSLAM to load a system
image. To do so, change the least significant hexadecimal digit to one of these values:
• 0—Loads the system image manually using the boot command in ROM monitor mode.
• 1—Loads the system image from boot ROM.
• 2 to F—Loads the system image from boot system commands in the startup configuration file or
from a default system image stored on a network server.
For example, if the current configuration register setting is 0x101 and you want to load a system image
from boot system commands in the startup configuration file, change the configuration register setting
to 0x102.
Step 3 Reboot the DSLAM to make your changes to the configuration register take effect.
Table 9-1 Configuration Register Bootfield Description
Configuration Register
Break
Enabled/Disabled
1
1. Enabled allows a hardware break during the first 30 seconds.
Description
0x000 Enabled Boot manually.
0x001 Enabled Boot from ROM.
0x002
through
0x00F
Enabled Boot from the default filename specified “nn”
in boot system configuration.
0x100 Disabled Boot manually.
0x101 Disabled Boot from ROM.
0x102
through
0x10F
Disabled Boot from the default filename specified “nn”
in boot system configuration.
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