This field records how much the counter for CRC (cyclic redundancy check) errors — frames whose checksum did not match their contents, meaning the frame was corrupted somewhere on the wire increased during the most recent collection interval, rather than the lifetime cumulative total. For a network admin, on this network-interface error table, a climbing CRC count is the classic signature of a bad cable, a failing SFP, or electrical noise on the link, and is usually the first counter an admin checks when a NIC reports flakiness. For example, 3 CRC errors in the last interval on this specific FCoE path would already be worth a closer look, since this counter should normally sit at or near zero.