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Sometimes it is possible that a network interface graph shows a speed, higher than physically possible. This article explains how that can happen. |
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As the calculation of interface speed needs data at two points in time, timing is of the essence. Consider an SNMP device being under heavy load and failing to respond in a timely manner. This can lead to both decreased in or increased throughput, depending on the exact scenario.
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The OIDs that are being queried for interface throughput calculation can be 32-bit or 64-bit. While it is more likely for a 32-bit counter to overflow, 64-bit counters can also overflow. The result of such an overflow is with utmost certainty a an off throughput calculation.
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