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IEEE Journal on Selected Areas in Communications
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IEEE/ACM Transactions on Networking (TON)
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CoNEXT '08 Proceedings of the 2008 ACM CoNEXT Conference
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IEEE/ACM Transactions on Networking (TON)
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IMC '10 Proceedings of the 10th ACM SIGCOMM conference on Internet measurement
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Proceedings of the 2011 ACM/IEEE Seventh Symposium on Architectures for Networking and Communications Systems
Towards bandwidth estimation using flow-level measurements
AIMS'12 Proceedings of the 6th IFIP WG 6.6 international autonomous infrastructure, management, and security conference on Dependable Networks and Services
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SNMP statistics are usually collected over intervals of 5 minutes and correspond to average activity of IP links and network elements for the duration of the interval. Nevertheless, reports of traffic performance across periods of minutes can mask out performance degradation due to short-lived events, such as micro-congestion episodes, that manifest themselves at smaller time scales. In this paper we perform a measurement study of packet traces collected inside the Sprint IP network to identify the time scales over which micro-congestion episodes occur. We characterize these episodes with respect to their amplitude, frequency and duration. We define a new performance metric that could be easily computed by a router and reported every 5 minutes through SNMP to shed light into the micro-behavior of the carried traffic. We show that the proposed performance metric is well suited to track the time scales over which micro-congestion episodes occur, and may be useful for a variety of network provisioning tasks.