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. This paper performs a measurement study of packet traces collected inside the Sprint IP network to identify the time scales over which micro-congestion episodes occur.
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