Changing the default configuration file
To change the default configuration file to one that you have previously saved, use both the load and save commands.
Load a previously saved configuration and save it as the default configuration
Load the previously saved configuration file (testconfig) from the default directory by specifying only the file name and then save it to the default file (config.boot).
vyatta@vyatta# load testconfig Loading configuration file /config/testconfig... No configuration changes to commit Done  vyatta@vyatta# save Saving configuration to '/config/config.boot'... Done  vyatta@vyatta#
At this point, the configurations in the testconfig and config.boot files are the same. The currently active configuration is the same as what is loaded when the system restarts.