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New Member

Output queue drops

on a 3750x stack i se allot of output queue drops.

But the number of drops change randomly:

xxxx#sh clock

11:56:24.787 UTC Mon Jan 30 2012

xxxx#sh int sum | i GigabitEthernet1/0/42

* GigabitEthernet1/0/42         0         0         0     30460         0         0      1000         1         0

xxxx#sh int sum | i GigabitEthernet1/0/42

* GigabitEthernet1/0/42         0         0         0     91380         0         0      1000         1         0

xxxx#sh int sum | i GigabitEthernet1/0/42

* GigabitEthernet1/0/42         0         0         0    152300         0         0         0         0         0

xxxx#sh int sum | i GigabitEthernet1/0/42

* GigabitEthernet1/0/42         0         0         0    152300         0         0         0         0         0

xxxx#sh int sum | i GigabitEthernet1/0/42

* GigabitEthernet1/0/42         0         0         0    152300         0         0         0         0         0

xxxx#sh int sum | i GigabitEthernet1/0/42

* GigabitEthernet1/0/42         0         0         0    182760         0         0         0         0         0

xxxx#sh int sum | i GigabitEthernet1/0/42

* GigabitEthernet1/0/42         0         0         0     30460         0         0         0         0         0

xxxx#sh int sum | i GigabitEthernet1/0/42

* GigabitEthernet1/0/42         0         0         0     30460         0         0         0         0         0

xxxx#sh int sum | i GigabitEthernet1/0/42

* GigabitEthernet1/0/42         0         0         0     30460         0         0      1000         1         0

xxxx#sh int sum | i GigabitEthernet1/0/42

* GigabitEthernet1/0/42         0         0         0     30460         0         0      1000         1         0

xxxx#sh int sum | i GigabitEthernet1/0/42

* GigabitEthernet1/0/42         0         0         0     30460         0         0      1000         1         0

xxxx#sh int sum | i GigabitEthernet1/0/42

* GigabitEthernet1/0/42         0         0         0     30460         0         0      1000         1         0

xxxx#sh int sum | i GigabitEthernet1/0/42

* GigabitEthernet1/0/42         0         0         0     91380         0         0      1000         1         0

xxxx#sh int sum | i GigabitEthernet1/0/42

* GigabitEthernet1/0/42         0         0         0    121840         0         0         0         0         0

xxxx#sh int sum | i GigabitEthernet1/0/42

* GigabitEthernet1/0/42         0         0         0    121840         0         0         0         0         0

xxxx#sh int sum | i GigabitEthernet1/0/42

* GigabitEthernet1/0/42         0         0         0    152300         0         0         0         0         0

xxxx#sh int sum | i GigabitEthernet1/0/42

* GigabitEthernet1/0/42         0         0         0     30460         0         0         0         0         0

xxxx#sh int sum | i GigabitEthernet1/0/42

* GigabitEthernet1/0/42         0         0         0     30460         0         0         0         0         0

xxxx#sh int sum | i GigabitEthernet1/0/42

* GigabitEthernet1/0/42         0         0         0     30460         0         0      1000         1         0

xxxx#sh int sum | i GigabitEthernet1/0/42

* GigabitEthernet1/0/42         0         0         0     30460         0         0      1000         1         0

xxxx#sh clock                           

11:56:48.458 UTC Mon Jan 30 2012

xxxx#

I don't have any complaints from users.

/claus

  • LAN Switching and Routing
2 REPLIES

Output queue drops

Hi,

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.


Please rate all the helpfull posts.
Regards,
Naidu.

New Member

Output queue drops

I know i don't have any congestetions on that part of the network.

The funny thing is that the number under the OQD is changing from high to low back to high...

The switch is used as a access switch. And there is no OQD on the uplinks.. only on user ports that basicly are idle.

/claus

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