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Since posting the question I found the following bug which looks similar to your changes. Thanks.CSCeg29704 Bug Details Headline Need to change 3750/3560 default QOS egress buffer allocation Product 3750 Model all Component qos Duplicate of ...
Does anyone know if this is a bug ?? We have had the same thing with some 3560's running 12.2.20EX, no QoS config but found that mls qos is on by default and doesn't show in the config. Issueing the no mls qos command fixed the throughput problems.