We are troubleshooting a performance issue in our Network. UDP traffic from a particular application is completely congesting the link.
Though we have QoS to throttle the traffic from the application to use only 9% bandwith of the link but that application flodding the traffic around 80% of the link. The traffic from the application is getting categorised as default traffic CS0.
Class class-default fair-queue bandwidth remaining 9 (%)
Is there anything we are missing in the configuration of the class-map that is alowing the flodding of the UDP traffic?
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You might misunderstand the purpose of the CBWFQ bandwidth statement. It guarantees a minimum, it doesn't limit the class from using all the link bandwidth.
The latter, though, isn't necessarily bad. Other classes should be able to obtain their bandwidth guarantees, and as you've defined FQ in the class, a high rate flow shouldn't monopolize the bandwidth (i.e. other flows will get their share to).
With QoS, the question shouldn't be whether your UDP traffic can acquire 80% of the link, but rather it is adverse to other applications when it does acquire 80%. If it is adverse, you can often just lower its bandwidth guarantee.
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