cvsup is guided by a configuration file that describes what files to update, and the source from which to update them.
Here is a basic DragonFly cvsup configuration file:
*default host=cvsup.dragonflybsd.org *default base=/usr *default prefix=/usr *default release=cvs *default release=cvs tag=. *default delete use-rel-suffix *default compress cvs-root cvs-src cvs-dfports
Place the above text in a file. Run cvsup using that file as an argument: cvsup /path/to/config. Your system source files will be updated, and your dfports overrides will also be up-to-date.
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