Basic System Configuration Guide Boot Options
Edition: 01 3HE 11010 AAAC TQZZA 135
5.1.1 Configuration and Image Loading
When the system executes the boot.ldr file, the initialization parameters from the
BOF are processed. Three locations can be configured for the system to search for
the files that contain the runtime image. The locations can be local or remote. The
first location searched is the primary image location. If not found, the secondary
image location is searched, and lastly, the tertiary image location is searched.
If the files cannot be found or loaded, the system enters a console message dialog
session prompting the user to enter alternate file locations and filenames.
When the runtime image is successfully loaded, control is passed from the bootstrap
loader to the image. Depending on the options in the BOF file, the runtime image
loads the configuration in one of two ways.
If ADP is enabled, no configuration files are processed at startup. Instead, ADP
discovers the node configuration from the network and the primary-config file is
generated based on the configuration discovered by ADP. Any existing
primary-config file is backed up, then overwritten.
If ADP is not enabled, the runtime image attempts to locate the configuration file as
configured in the BOF. Like the runtime image, three locations can be configured for
the system to search for the configuration file. The locations can be local or remote.
The first location searched is the primary configuration location. If not found, the
secondary configuration location is searched, and lastly, the tertiary configuration
location is searched.
The configuration file includes chassis, CSM, adapter card and port configurations,
as well as system, routing, and service configurations.
Figure 6 displays the boot sequence.
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