[c-nsp] Constant output drops on etherchannel

Phil Mayers p.mayers at imperial.ac.uk
Fri Jan 14 11:12:52 EST 2011


On 14/01/11 16:08, Dan Letkeman wrote:
> Hello,
>
> I'm seeing many of our etherchannel's on different switches having output drops:

Platform? IOS version? Config of the interface(s) (routed, SVI, etc.)

>    Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 898085

Are you monitoring the traffic rate? Do the drops correspond to traffic 
bursts? Do you have QoS enabled?

> I also see that it usually uses one port of the etherchannel to a high
> degree, say 92% before it seems to push data through the other
> connection.

That's not necessarily unusual, depending on your etherchannel load 
balancing algorithm and traffic patterns. But you haven't really 
supplied enough info for people to help you.


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