Traffic bursts can cause output drops even when the interface output rate is significantly lower than the maximum interface capacity. By default, the output rates in the show interface command are averaged over five minutes, which is not adequate to capture any short-lived bursts. It is best to average them over 30 seconds. In this case, you can use Wireshark in order to capture egress traffic with the Switched Port Analyzer (SPAN), which is analyzed in order to identify the bursts.
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