We have a 3750 stack include 48T and G-24T switch. The server is 1000/Full and workstation is 100/full. And we enable mls qos.
I got a very slow speed when copying file from server to workstation even off hour. From the sniffer it showed that some packet were lost. But I did show interface and did not see any drop packets. Where are those packet?
I did a sniff on the traffic. And it showed that some packets were dropped in the FE port. Dose anyone has a good mls qos configuration for this situation? I tried different mls qos setting, but everytime I enable mls qos the speed slow down dramatically.
Following the previous post there are fundamental differences between 12.1 and 12.2 concerning QoS.
Certainly from 12.2 there is an additional queue-set for Gigabit interfaces. Previously all interfaces by default have queue-set 1 applied and therefore are restricted by thresholds configured regardless of port type.
Typically by default COS 0 or untrusted traffic will be mapped to the egress queue-4 unless you have changed your COS mappings.
Is there a specific reason why you have configured SRR in the first instance? You do not have any trust on either of the ports and will therefore be untrusted. Consequently all queue will be services accordingly, and COS 0 traffic will be the first to be dropped.
Congestion commonly occurs on egress, and your configuration unfortunately does indicate any output cos maps, output thresholds or buffers.
See the following example, like I said queue-set 1 is applied to FE and queue-set 2 is applied to GE.
Depending on your traffic profile, you may need to service queue depending on whether you have voice and/or videowhether. If you have neither of these requirements then configure SRR on the interfaces as follows:-
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