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Open AccessArticle

Modeling of Clos Switching Structures with Dynamically Variable Number of Active Switches in the Spine Stage

Institute of Communication and Computer Networks, Faculty of Computing and Telecommunications, Poznan University of Technology, ul. Polanka 3, 60-965 Poznan, Poland
Institute of Management, Department of Investment and Real Estate, Poznan University of Economics and Business, aleja Niepodległości 10, 61-875 Poznan, Poland
Author to whom correspondence should be addressed.
Electronics 2020, 9(7), 1073;
Received: 20 April 2020 / Revised: 23 June 2020 / Accepted: 25 June 2020 / Published: 30 June 2020
(This article belongs to the Special Issue Telecommunication Networks)
This article proposes a new analytical model of a switching structure using a Clos network topology. The assumption is that, in the structure under consideration, it is possible to switch off temporarily a certain number of spine switches (those in the middle stage of the switching fabric) depending on the current intensity of the offered traffic to reduce power consumption. The solution presented in the article can be used in present-day multiservice switching fabrics and in networks connecting servers in data centers. The developed analytical model allows the value of blocking probabilities for different stream classes of multiservice traffic to be evaluated in switching structures (switching fabrics) with a variable number of switches in the middle stage. The results obtained on the basis of the analytical model are compared with the results obtained as a result of relevant simulation experiments for a selected structure of the switching fabric. The study confirms high accuracy of the proposed model. This model can be used in further works to evaluate the effectiveness of energy-saving switching fabrics and the networks of data centers, as well as to construct energy-saving control algorithms that would control these switching structures, that is, algorithms that would change the topology of the switching fabric depending on changes in the offered traffic.
Keywords: switching fabric; multiservice traffic; energy-aware systems switching fabric; multiservice traffic; energy-aware systems
MDPI and ACS Style

Głąbowski, M.; Sobieraj, M.; Stasiak, M.; Dominik Stasiak, M. Modeling of Clos Switching Structures with Dynamically Variable Number of Active Switches in the Spine Stage. Electronics 2020, 9, 1073.

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