3-12
Catalyst 3750 Switch Software Configuration Guide
OL-8550-02
Chapter 3 Assigning the Switch IP Address and Default Gateway
Modifying the Startup Configuration
Modifying the Startup Configuration
These sections describe how to modify the switch startup configuration:
• Default Boot Configuration, page 3-12
• Automatically Downloading a Configuration File, page 3-12
• Booting Manually, page 3-13
• Booting a Specific Software Image, page 3-14
• Controlling Environment Variables, page 3-15
See also “Switch Stack Configuration Files” section on page 5-14 and Appendix C, “Working with the
Cisco IOS File System, Configuration Files, and Software Images,” for information about switch stack
configuration files.
Default Boot Configuration
Table 3-3 shows the default boot configuration.
Automatically Downloading a Configuration File
You can automatically download a configuration file to your switch by using the DHCP-based
autoconfiguration feature. For more information, see the “Understanding DHCP-Based
Autoconfiguration” section on page 3-3.
Specifying the Filename to Read and Write the System Configuration
By default, the Cisco IOS software uses the file config.text to read and write a nonvolatile copy of the
system configuration. However, you can specify a different filename, which will be loaded during the
next boot cycle.
Table 3-3 Default Boot Configuration
Feature Default Setting
Operating system software image The switch attempts to automatically boot the system using information in the BOOT
environment variable. If the variable is not set, the switch attempts to load and
execute the first executable image it can by performing a recursive, depth-first search
throughout the flash file system.
The Cisco IOS image is stored in a directory that has the same name as the image file
(excluding the .bin extension).
In a depth-first search of a directory, each encountered subdirectory is completely
searched before continuing the search in the original directory.
Configuration file Configured switches use the config.text file stored on the system board in flash
memory.
A new switch has no configuration file.
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