output queue drops indicate router received information faster than the information could be send out of interface due to input, output speed mismatch, check the speed and MTU
Output drops are caused by a congested interface. For example, the traffic rate on the outgoing interface cannot accept all packets that should be sent out. The ultimate solution to resolve the problem is to increase the line speed. However, there are ways to prevent, decrease, or control output drops when you do not want to increase the line speed. You can prevent output drops only if output drops are a consequence of short bursts of data. If output drops are caused by a constant high-rate flow, you cannot prevent the drops. However, you can control them.
When packets are processed, they are sent to the output queue of the outgoing interface. Issue the show interfaces exec command to view the size of the queue, the current number of packets in the queue, and the number of drops.
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