This object reports the type of interval over which performance-monitoring data is being collected for this Ethernet traffic port. Knowing the interval type lets the admin correctly interpret the dozens of accompanying Ethernet counters, such as broadcast frames or collisions, as either a short snapshot or a longer accumulation. For example, when troubleshooting a sudden spike in collisions, an admin would first check cmEthernetTrafficPortStatsIntervalType to know whether the elevated count reflects just 5 minutes or a full day of traffic.