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Network Verification via Routing Table Queries

Abstract : We address the problem of verifying the accuracy of a map of a network by making as few measurements as possible on its nodes. This task can be formalized as an optimization problem that, given a graph G = (V,E), and a query model specifying the information returned by a query at a node, asks for finding a minimum-size subset of nodes of G to be queried so as to univocally identify G. This problem has been faced w.r.t. a couple of query models assuming that a node had some global knowledge about the network. Here, we propose a new query model based on the local knowledge a node instead usually has. Quite naturally, we assume that a query at a given node returns the associated routing table, i.e., a set of entries which provides, for each destination node, a corresponding (set of) first-hop node(s) along an underlying shortest path. First, we show that any network of n nodes needs Ω(loglogn) queries to be verified. Then, we prove that there is no o(logn)-approximation algorithm for the problem, unless \sf P=\sf NP , even for networks of diameter 2. On the positive side, we provide an O(logn)-approximation algorithm to verify a network of diameter 2, and we give exact polynomial-time algorithms for paths, trees, and cycles of even length.
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Contributor : Ralf Klasing Connect in order to contact the contributor
Submitted on : Thursday, December 1, 2011 - 8:29:49 PM
Last modification on : Friday, December 3, 2021 - 3:38:07 PM

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Evangelos Bampas, Davide Bilò, Guido Drovandi, Luciano Gualà, Ralf Klasing, et al.. Network Verification via Routing Table Queries. SIROCCO 2011, Jun 2011, Gdańsk, Poland. pp.270--281, ⟨10.1007/978-3-642-22212-2_24⟩. ⟨hal-00647362⟩



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