Cisco Systems 3750E manual Working with Software Images, Clearing the Startup Configuration File

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

Working with Software Images

Clearing the Startup Configuration File

To clear the contents of your startup configuration, use the erase nvram: or the erase startup-configprivileged EXEC command.

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

Deleting a Stored Configuration File

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.

Working with Software Images

This section describes how to archive (download and upload) software image files, which contain the system software, the Cisco IOS code, and the embedded device manager software.

Note Instead of using the copy privileged EXEC command or the archive tar privileged EXEC command, we recommend using the archive download-swand archive upload-swprivileged EXEC commands to download and upload software image files. For switch stacks, the archive download-swand archive upload-swprivileged EXEC commands can only be used through the stack master. Software images downloaded to the stack master are automatically downloaded to the rest of the stack members.

To upgrade a switch with an incompatible software image, use the archive copy-swprivileged EXEC command to copy the software image from an existing stack member to the incompatible switch. That switch automatically reloads and joins the stack as a fully functioning member.

You can download a switch image file from a TFTP, FTP, or RCP server to upgrade the switch software. If you do not have access to a TFTP server, you can download a software image file directly to your PC or workstation by using a web browser (HTTP) and then by using the device manager or Cisco Network Assistant to upgrade your switch. For information about upgrading your switch by using a TFTP server or a web browser (HTTP), see the release notes.

You can replace the current image with the new one or keep the current image in flash memory after a download.

You can use the archive download-sw /allow-feature-upgradeprivileged EXEC command to allow installation of an image with a different feature set, for example, upgrading from the noncryptographic universal image with the IP services feature set to the cryptographic universal image with the advanced IP services feature set. You can also use the boot auto-download-swglobal configuration command to specify a URL to use to get an image for automatic software upgrades. When you enter this command, the master switch uses this URL in case of a version mismatch.

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

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