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Chapter 23
Modifying the Switch Boot Configuration
Table 23-1 Default Switch Boot Configuration (continued)
Feature
ignore-config parameter
BOOT environment variable
CONFIG_FILE environment variable
CONFIG_FILE recurrence configuration register
parameter
CONFIG_FILE overwrite configuration register
parameter
CONFIG_FILE synchronization configuration
register parameter
Setting the Configuration Register
Configuration register settings are not copied automatically to a redundant supervisor engine. You
Note
must set the configuration register separately for each supervisor engine in the switch.
These sections describe how to modify the configuration register:
•
•
•
•
•
•
•
Setting the Boot Field in the Configuration Register
You can determine the boot method the switch will use at the next startup by setting the boot field in the
configuration register. This command affects only the configuration register bits that control the boot
field and leaves the remaining bits unaltered. The following boot methods are supported:
•
•
•
We recommend that you use only the rommon and system options to the set boot config-register
Note
boot command.
78-13315-02
Setting the Boot Field in the Configuration Register, page 23-5
Setting the ROM-Monitor Console-Port Baud Rate, page 23-6
Setting CONFIG_FILE Recurrence, page 23-7
Setting CONFIG_FILE Overwrite, page 23-7
Setting CONFIG_FILE Synchronization, page 23-8
Setting the Switch to Ignore the NVRAM Configuration, page 23-9
Setting the Configuration Register Value, page 23-10
ROM monitor—Enter the rommon keyword to force the switch to remain in ROM-monitor mode
at startup.
Bootflash—Enter the bootflash keyword to cause the switch to boot from the first image stored in
the onboard Flash.
System—Enter the system keyword to boot from the image specified in the BOOT environment
variable (the default).
Default Configuration
Disabled
Empty
slot0:switch.cfg
Nonrecurring
Overwrite
Synchronization disabled
Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4
Setting the Configuration Register
23-5
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