Compact Oblivious Routing in Weighted Graphs

Authors Philipp Czerner , Harald Räcke



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Author Details

Philipp Czerner
  • Department of Informatics, TU München, Germany
Harald Räcke
  • Department of Informatics, TU München, Germany

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Philipp Czerner and Harald Räcke. Compact Oblivious Routing in Weighted Graphs. In 28th Annual European Symposium on Algorithms (ESA 2020). Leibniz International Proceedings in Informatics (LIPIcs), Volume 173, pp. 36:1-36:23, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2020) https://doi.org/10.4230/LIPIcs.ESA.2020.36

Abstract

The space-requirement for routing-tables is an important characteristic of routing schemes. For the cost-measure of minimizing the total network load there exist a variety of results that show tradeoffs between stretch and required size for the routing tables. This paper designs compact routing schemes for the cost-measure congestion, where the goal is to minimize the maximum relative load of a link in the network (the relative load of a link is its traffic divided by its bandwidth). We show that for arbitrary undirected graphs we can obtain oblivious routing strategies with competitive ratio 𝒪̃(1) that have header length 𝒪̃(1), label size 𝒪̃(1), and require routing-tables of size 𝒪̃(deg(v)) at each vertex v in the graph.
This improves a result of Räcke and Schmid who proved a similar result in unweighted graphs.

Subject Classification

ACM Subject Classification
  • Theory of computation → Network flows
  • Networks → Network algorithms
Keywords
  • Oblivious Routing
  • Compact Routing
  • Competitive Analysis

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