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Randomized Local Fast Rerouting for Datacenter Networks with Almost Optimal Congestion

Authors Gregor Bankhamer, Robert Elsässer, Stefan Schmid



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Author Details

Gregor Bankhamer
  • Department of Computer Sciences, Universität Salzburg, Austria
Robert Elsässer
  • Department of Computer Sciences, Universität Salzburg, Austria
Stefan Schmid
  • TU Berlin, Germany
  • Faculty of Computer Science, Universität Wien, Austria

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Gregor Bankhamer, Robert Elsässer, and Stefan Schmid. Randomized Local Fast Rerouting for Datacenter Networks with Almost Optimal Congestion. In 35th International Symposium on Distributed Computing (DISC 2021). Leibniz International Proceedings in Informatics (LIPIcs), Volume 209, pp. 9:1-9:19, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2021)
https://doi.org/10.4230/LIPIcs.DISC.2021.9

Abstract

To ensure high availability, datacenter networks must rely on local fast rerouting mechanisms that allow routers to quickly react to link failures, in a fully decentralized manner. However, configuring these mechanisms to provide a high resilience against multiple failures while avoiding congestion along failover routes is algorithmically challenging, as the rerouting rules can only depend on local failure information and must be defined ahead of time. This paper presents a randomized local fast rerouting algorithm for Clos networks, the predominant datacenter topologies. Given a graph G = (V,E) describing a Clos topology, our algorithm defines local routing rules for each node v ∈ V, which only depend on the packet’s destination and are conditioned on the incident link failures. We prove that as long as number of failures at each node does not exceed a certain bound, our algorithm achieves an asymptotically minimal congestion up to polyloglog factors along failover paths. Our lower bounds are developed under some natural routing assumptions.

Subject Classification

ACM Subject Classification
  • Theory of computation → Approximation algorithms analysis
  • Theory of computation → Distributed algorithms
  • Networks → Data path algorithms
Keywords
  • local failover routing
  • congestion
  • randomized algorithms
  • datacenter networks

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