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output packets late drop

Hi all, when looking at the interface below I see packet late drops and im trying to determine a few things,

what causes output packet late drops? I'm assuming the sat on the output queue too long to be any good to the other side

how is a packet determined to be late? if there a counter on the output queue

can late packets be anything that uses ips like tcp/udp? I'm assuming yes.

thanks in advance, Paul

Serial8/1/0 is up, line protocol is up

  Hardware is PODS3 Serial

   MTU 4470 bytes, BW 44210 Kbit, DLY 200 usec,

  Last input 00:00:00, output 00:00:00, output hang never

  Last clearing of "show interface" counters 2d03h

  Input queue: 0/75/0/118 (size/max/drops/flushes); Total output drops: 1187

  Queueing strategy: Class-based queueing

  Output queue: 0/40 (size/max)

  30 second input rate 23957000 bits/sec, 2847 packets/sec

  30 second output rate 6343000 bits/sec, 1708 packets/sec

     230162732 packets input, 196193195259 bytes, 0 no buffer

     Received 0 broadcasts (0 IP multicasts)

     0 runts, 0 giants, 0 throttles

              0 parity

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

     189539629 packets output, 110624143393 bytes, 0 underruns

     1187 packets late drop, 1509802 bytes late drop

     0 output errors, 0 applique, 0 interface resets

     0 output buffer failures, 0 output buffers swapped out

     0 carrier transitions

   rxLOS inactive, rxLOF inactive, rxAIS inactive

   txAIS inactive, rxRAI inactive, txRAI inactive

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