Cisco Systems 3750E manual Modifying the Startup Configuration, Default Boot Configuration

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 Appendix B, “Working with the Cisco IOS File System, Configuration Files, and Software Images,” for information about switch configuration files. See the “Switch Stack Configuration Files” section on page 5-15for information about switch stack configuration files.

Default Boot Configuration

Table 3-3shows the default boot configuration.

Table 3-3	Default Boot Configuration
Feature		Default Setting
Operating system software image		The switch attempts to automatically boot up 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.

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.

Catalyst 3750-E and 3560-E Switch Software Configuration Guide

3-12 OL-9775-02