Examples The following example copies the running configuration file to the device. This configuration is then used as the startup configuration when the system is restarted: Device# copy system:running-config usbflash0:config2 Device# configure terminal Device(config)# boot config usbflash0:config2 Device(config)# end Device# copy system:running-config nvram:startup-config [ok] Device# show boot BOOT variable = usbflash0:rsp-boot-m CONFIG_FILE variable = nvram:
Current CONFIG_FILE variable = usbflash0:config2 Configuration register is 0x010F What to Do Next After you specify a location for the startup configuration file, the nvram:startup-config command is aliased to the new location of the startup configuration file. The more nvram:startup-config EXEC command displays the startup configuration, regardless of its location. The erase nvram:startup-config EXEC command erases the contents of NVRAM and deletes the file pointed to by the CONFIG_FILE environment variable.
When you save the configuration using the copy system:running-config nvram:startup-config command, the device saves a complete version of the configuration file to the location specified by the CONFIG_FILE environment variable and a distilled version to NVRAM. A distilled version is one that does not contain access list information. If NVRAM contains a complete configuration file, the device prompts you to confirm your overwrite of the complete version with the distilled version. If NVRAM contains a distilled configuration, the device does not prompt you for confirmation and proceeds with overwriting the existing distilled configuration file in NVRAM.
Note If you specify a file in a flash device as the CONFIG_FILE environment variable, every time you save your configuration file with the copy system:running-config nvram:startup-config command, the old configuration file is marked as “deleted,” and the new configuration file is saved to that device. Eventually, Flash memory fills up as the old configuration files still take up memory. Use the squeeze EXEC command to permanently delete the old configuration files and reclaim the space. Managing Configuration Files What to Do Next Command or Action Purpose Device# copy system:running-config nvram:startup-config Step 7 show boot Example:
Device# show boot (Optional) Allows you to verify the contents of the CONFIG FILE environment variable. _ Managing Configuration Files 31