CBWFQ class with higher weight drops packets

[m.baker]

Hi,

I have three classes define in CBWFQ. The class with the most traffic (batch transfers) is only allocated 10% of bandwidth, while real time/interactive traffic is allocated to a class which gets 65% of bandwidth. When the batch transfer class gets a lot of traffic, I see lots of packet drops in that class. So far so good,as this is the traffic that I want to be penalized. The interactive traffic class however still sees a relatively high number of drops for the little traffic it has to sends. I would think that the interactive class would not drop packets unless it needs to use more then 65% of bandwidth....Is this normal behavior ? If so, how can it be explained ? The policy is attached to an ATM OC3 interface on a 7500 router. Seems like the weight provided by the bandwidth statement is not enough to avoid drops for the interactive traffic.

Thanks

[n-saquib]

Check if you are using RED in connection with your CBWFQ. In RED you can define the way you want to drop the traffic in case of congestion.

QOS config from your router will be bit more helpful to look in the issue.

Regards,