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Internet disruptions such as the Northeast Blackout and the Taiwan earthquake highlight the fragility of today's Internet. The authors' goal in this paper is to investigate the robustness of inter-domain communication at the level of Autonomous Systems (ASes), taking into account both topological connectivity and compliance to routing policies. To this end, they introduce the concept of k-fault tolerance for Type-of-Relationship (ToR) graphs, which requires that any two nodes (ASes) remain reachable from each other even after removing arbitrary k nodes from the AS graph. Their main contribution is theoretical and concerns the complexity of the k-fault tolerance decision problem.
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