Output drops are just due to congestion or sudden burst of traffic on that interface, and the outgoing interface cannot accept all packets that should be sent out. Easiest way to avoid output drops, is to increase the line speed.. since it isnt a duplex issue, i dont see any other means by which you can control this, except applying QOS..
queue size can be changed, but it isnt really recommended, as it can timeout geniune tcp handshakes.. This is what I found on CCO:
"Never increase the output queue in an attempt to prevent output drops. If packets stay too long in the output queue, TCP timers can expire and trigger retransmission. Retransmitted packets only congest the outgoing interface even more."
Give it a shot with QOS, if you have the matrix of applications on the network..
Hope this helps.. all the best.. rate replies if found useful.
I think flowcontrol is an option for receive buffer, and not output queues.. ill have to check more on this... you need to enable it both the ends, to make sure the switch sends pause frames to the opposite switch when the receive buffer becomes full.. are you also seeing input queue drops on the interface?
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