This counter records the lowest instantaneous receive bit rate measured in any single second during the current performance-monitoring interval on this port. A very low minimum alongside a healthy average can alert the admin to brief gaps in inbound traffic, which might indicate momentary link flaps or an upstream device pausing transmission. For example, if cmEthernetTrafficPortStatsIBRMinRx drops to zero for a port expected to carry continuous streaming traffic, the admin would investigate a possible micro-outage during that second.