Balloon layouts display links between managed objects in a balloon tree structure. The root is typically whatever device you have expanded or drilled into.
You can specify the following in the settings for this layout:
Root / Child wedge angle sector – Use the radio buttons determine the angle (360, 180). The root sector determines how much of an arc around that root the child nodes fill, and the child sector determines the orientation around the child nodes.
Root selection policy -- Select the item you want at the center of this view (Directed [a pop-up appears with the remaining selections], Most closed / surrounded / weighted).
Equal angle distribution -- Select whether to distribute nodes at equal angles.