  The Internet topology at the Autonomous Systems level (AS graph) has a
power--law degree distribution and a tier structure. In this paper, we
introduce the Interactive Growth (IG) model based on the joint growth of new
nodes and new links. This simple and dynamic model compares favorable with
other Internet power--law topology generators because it not only closely
resembles the degree distribution of the AS graph, but also accurately matches
the hierarchical structure, which is measured by the recently reported
rich-club phenomenon.
