Will this disable all QoS functions except for changing all DSCP values to 0? It seems strange that the switch would allow the command "mls qos rewrite ip dscp" after "no mls qos" if there were no effect. It would also seem logical that without "mls qos", "mls rewrite ip dscp" would be rendered useless.
With mls qos disabled , all the ports are in "trusted" state which means the switch will not change the dscp whatsoever. So even having the "mls qos rewrite ip dscp" should not have any effect when the qos is disabled. It does not really matter that you have this command or not , whats important is the port trust state and thats always "trusted" when qos is disabled and this is true for all switching platforms.
Its best to leave the qos settings at default. If you are running anything lower then 12.2(25)SEB , then be aware of CSCeg29704. By enabling qos , since the port goes to untrusted state , all dscps will be rewritten to 0. So just by enabling qos , you will get what you want . Although it surprises me that just by enabling qos , you are getting double the performance w/o enabling any kind of classification.
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