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Investigating the Causes of Congestion on the African IXP Substrate

Fanou, Roderick and Valera, Francisco and Dhamdhere, Amogh (2017) Investigating the Causes of Congestion on the African IXP Substrate. In: The 17th ACM Internet Measurement Conference (IMC 2017), 1-3 November 2017, London, UK.

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The goal of this work is to investigate the prevalence, causes, and impact of congestion on the African IXP substrate. Towards this end, we deployed Ark probes (within networks peering) at six African IXPs and ran the time-sequence latency probes (TSLP) algorithm, thereby collecting latency measurements to both ends of each mapped AS link for a whole year. We were able to detect congestion events and quantify their periods and magnitudes at four IXPs. We then verified the events and investigated the causes by interviewing the IXP operators. Our results show that only 2.2% of the discovered IP links experienced (sustained or transient) congestion during our measurement period. Our findings suggest the need for ISPs to carefully monitor the provision of their peering links, so as to avoid or quickly mitigate the occurrence of congestion. Regulators may also define the maximum level of packet loss in those links to provide some protection to communications routed through local IXPs.

Item Type: Conference or Workshop Papers (Paper)
Additional Information: This paper was accepted for publication on July 28, 2017. The camera-ready version was submitted on September 28, 2017. The program of the conference is available at
Uncontrolled Keywords: Congestion, IXP, Performance.
Depositing User: Roderick Fanou
Date Deposited: 05 Oct 2017 07:04
Last Modified: 08 Nov 2017 15:22

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