[c-nsp] effect of 'mls qos'

Christopher E. Brown chris.brown at acsalaska.net
Mon Jun 1 02:09:25 EDT 2015

"mls qos" activates QoS, and that includes _ALL_ of the default QoS
configs including automatic classify and remark, and all the default queues.

On 5/31/15 22:02, Mike wrote:
> Hi Gang,
>      I have a question regarding the effect of 'mls qos' on a 3560g 
> switch, with no other configuration.
>      I did some testing and it seemed to me that the aggregate thruput 
> of my switch, which has 5 port channels with 2 gigE ports each, would 
> drastically drop to below 10mbps for a standard file copy on nfs. And 
> when I removed 'mls qos', the thruput would climb back up to 500 - 
> 700mbps range on that same file copy.
>      There is no qos fig in that switch, just that single statement. It 
> also does have 'ip services' code in it but it's only used really for 
> layer 2 switching. I just thought this was rather odd, wondering if 
> anyone has any thoughts on this.
> Mike--
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Christopher E. Brown   <chris.brown at acsalaska.net>   desk (907) 550-8393
                                                     cell (907) 632-8492
IP Engineer - ACS

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