This Counter32 counts subnetwork-unicast packets delivered up to a higher-layer protocol for this extended-table interface row. An administrator compares it against the multicast and broadcast counters on the same row to judge what fraction of inbound traffic is normal point-to-point communication versus broadcast noise. For example, a healthy interface should show cnt2XIfInUcastPkts growing much faster than its multicast or broadcast counterparts on the same row.