This read-only Counter32 counts runts, frames smaller than the Ethernet minimum frame size of 64 bytes, recorded on the monitored segment as a whole during this 15-second short-term sample, with 4294967294 meaning unknown. An admin treats a rising Runts count on the monitored segment as a whole as a sign of a duplex mismatch, a failing NIC, or a collision-heavy segment producing malformed short frames. For example, Runts climbing sharply on the monitored segment as a whole right after a switch port speed or duplex change would point the admin straight at that port as the likely cause.