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move_base (http://wiki.ros.org/move_base) is responsible for "coordinating" the different components, such as the global and local planner plugins, the recovery behaviors, and the layered costmaps.

Make sure you are actually loading and parametrizing a local planner and a local costmap. move_base will then pass the plan generated by your global planner to the local planner for execution.

Check out this tutorial as well: http://wiki.ros.org/navigation/Tutorials/RobotSetup