Cisco Systems 3560 Replacing and Rolling Back Configurations

B-19

Catalyst 3560 Switch Software Configuration Guide

OL-8553-06

Appendix B Working with the Cisco IOS File System, Configuration Files, and Software Images

Working with Configuration Files

To clear the contents of your startup configuration, use the erase nvram: or the erase startup-config

privileged EXEC command.

Caution You cannot restore the startup configuration file after it has been deleted.

To delete a saved configuration from flash memory, use the delete flash:filename privileged EXEC

command. Depending on the setting of the file prompt global configuration command, you might be

prompted for confirmation before you delete a file. By default, the switch prompts for confirmation on

destructive file operations. For more information about the file prompt command, see the Cisco IOS

Command Reference for Release 12.2.

Caution You cannot restore a file after it has been deleted.

Replacing and Rolling Back Configurations

The configuration replacement and rollback feature replaces the running configuration with any saved

Cisco IOS configuration file. You can use the rollback function to roll back to a previous configuration.

These sections contain this information:

• Understanding Configuration Replacement and Rollback, page B-19

• Configuration Guidelines, page B-21

• Configuring the Configuration Archive, page B-21

• Performing a Configuration Replacement or Rollback Operation, page B-22

To use the configuration replacement and rollback feature, you should understand these concepts:

• Archiving a Configuration, page B-19

• Replacing a Configuration, page B-20

• Rolling Back a Configuration, page B-20

The configuration archive provides a mechanism to store, organize, and manage an archive of

configuration files. The configure replace privileged EXEC command increases the configuration

rollback capability. As an alternative, you can save copies of the running configuration by using the copy

running-config destination-url privileged EXEC command, storing the replacement file either locally

or remotely. However, this method lacks any automated file management. The configuration

replacement and rollback feature can automatically save copies of the running configuration to the

configuration archive.