A geographic directed preferential internet topology model

Sagy Bar, Mira Gonen, Avishai Wool

Research output: Contribution to journalArticlepeer-review

Abstract

The goal of this work is to model the peering arrangements between Autonomous Systems (ASes). Most existing models of the AS-graph assume an undirected graph. However, peering arrangements are mostly asymmetric customer-provider arrangements, which are better modeled as directed edges. Furthermore, it is well known that the AS-graph, and in particular its clustering structure, is influenced by geography. We introduce a new model that describes the AS-graph as a directed graph, with an edge going from the customer to the provider, but also models symmetric peer-to-peer arrangements, and takes geography into account. We are able to mathematically analyze its power-law exponent and number of leaves. Beyond the analysis, we have implemented our model as a synthetic network generator we call GdTang. Experimentation with GdTang shows that the networks it produces are more realistic than those generated by other network generators, in terms of its power-law exponent, fractions of customer-provider and symmetric peering arrangements, and the size of its dense core. We believe that our model is the first to manifest realistic regional dense cores that have a clear geographic flavor. Our synthetic networks also exhibit path inflation effects that are similar to those observed in the real AS graph.

Original languageEnglish
Pages (from-to)4174-4188
Number of pages15
JournalComputer Networks
Volume51
Issue number14
DOIs
StatePublished - 10 Oct 2007

Keywords

  • AS-graph
  • Autonomous Systems
  • Dense core
  • Peering arrangements
  • Power-law exponent
  • Synthetic network generator

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