Router-level topologies of autonomous systems

In order to understand the Internet topology, it is important to analyze the underlying networks’ characteristics. Internet is enabled by independently operating Autonomous Systems (ASes) that collaborate to provide end-to-end communication. In this paper, we investigate the network characteristics of backbone ASes that provide transit connectivity. We collect router-level probe data sets from all of the public Internet topology measurement platforms and obtain network topologies of the backbone ASes. We then analyze the network characteristics of each AS and perform an in-depth analysis of the high ranked ASes. Analyzing two snapshots, we observe disassortative network topologies in the majority of AS topologies independent of their network size. Also, most of the top-ranked ASes have a densely connected core and exhibit power-law degree distributions.