This read-only Counter64 records the total number of well-formed packets received that were longer than 1518 octets but within the port's MTU, per its description, during this bin's collection period. Because these frames are otherwise valid, not corrupted, just larger than the classic Ethernet maximum, this counter typically reflects legitimate jumbo-frame traffic when jumbo frames are enabled, rather than an error condition, so a rising count here is only concerning if jumbo frames aren't expected on that port. An engineer verifying that a newly-enabled jumbo-frame configuration is actually being used by end devices would check this bin's oversize count to confirm larger-than-1518-byte frames are indeed passing through.