Analysis of Internet topology with three-level components model

Abstract

The vertical structure of the Internet can be considered as being made up of three-level components: backbone-level interconnection, mid-level transit , and locallevel-access. Furthermore, the connection of networks can be classified into two types: one-way and two-way connections. This paper will analyze one-way and two-way connections and attempt to integrate them with the three-level components model. Three main conclusions will be obtained: first, two-way connection is more socially desirable than one-way connection; second, the cross entry of vertical integrators is more socially desirable than no entry and single entry; third, the local structure of oneway connection and the global structure of two-way connection should be determined at the same time, and, if any, the local bottleneck of one-way connection should be determined afterward rather than beforehand.