output hang - Number of hours, minutes, and seconds (or never) since the interface was last reset because of a transmission that took too long. When the number of hours in any of the "last" fields exceeds 24 hours, the number of days and hours is printerd. If that field overflows, asterisks are printed.
input drops - Count of packets dropped on the input interface.
output drops - Count of packets dropped on the output interface. Note: Output drops have less impact on the performance of the router than do input drops.
no buffer - Number of input packets dropped because of no buffers. Compare with ignored.
broadcasts - Number of broadcasts received on the interface
runts - Frames received shorter than 64 bytes.
giants - Frames received that were greater than 1518 bytes.
throttles - Number of times the interface requested another interface within the router to slow down.
input errors - A total of no buffer, runts, giants, CRCs, frame, overrun, ignored, and aborts. This may not balance with the other counts.
CRC - Cyclic Redundancy Check failed on a input packet.
frame - Number of frames received that did not end on a 8-bit byte boundary.
overrun - The number of times the receiver hardware was unable to hand received data to a hardware buffer because the input rate exceeded the receiver's ability to handle the data.
ignored - Packets dropped because the interface hardware buffers ran low on internal buffers. These buffers are different from the system buffers mentioned previously.
abort - An illegal sequence of 1's bits was detected in a frame received.
dribble condition detected - Dribble bit error indicates that a frame is slightly too long. This frame error counter is incremented just for informational purposes; the router accepts the frame.
underruns - The number of times the transmitter has been running faster than the router can handle. This may never be reported on some interfaces.
output errors - A sum of all output errors. This may not tally with the output error.
collisions - The count of frames that were transmitted successfully after one collision. (Transmitted on the second attempt.)
interface resets - The number of times the interface had a reset. Normally a result of missed keepalives.
babbles - Count of frames transmitted greater than 1518 bytes.
late collision - A collision that occurs after the interface has started transmitting its frame.
deferred - The count of frames that were transmitted successfully after waiting because the media was busy.
lost carrier - The number of times the carrier was lost during transmission.
no carrier - The number of times the carrier was not present during the transmission.
output buffer failures - The number of times a packet was not output from the output hold queue because of a shortage of MEMD shared memory.
output buffers swapped out - The number of packets stored in main memory when the output queue is full; swapping buffers to main memory prevents packets from being dropped when output is congested. The number is high when traffic is bursty.
