With CBWFQ IP/TCP packets will be queued and not discarded, which will happen because of the policer. Dropped packets however will lead to reduced throughput for a TCP session. Thus in general for TCP based applications it is better to delay a packet than to drop it.
I think that Martin has supplied a nice explaination for why LLQ is not recommended with TCP application (policing -> dropping -> global synchronization --> reduce throughput), and thus CBWFQ (queuing rather than policing) is better for TCP traffic, on the other hand voice traffic (delay sensitive UDP traffic) is vice versa.
Thanks for the explanation it does make sense now. That's what I forgot the LLQ is almost the same as CBWFQ but use policing in its priority queue therefore cut the exceeding traffic and does not allow to burst or shape. That's why I like this forum, because if I write something stupid thing I will be corrected by others. :) There is proverb: The smart people learn from others mistake the stupid one from own.
You are very welcomed :), i think that we are all here to interact and exchange knowledge and information, we all make mistakes and we all have wrong understandings of technical issues (there is no one who knows everything perfectly), but we are all here to interact and solve any technical issues, i think that all of us including me have mistaken before, but the glory of this forum is that there is always someone to correct the conflicts in a nice and professional way, thank you Rick, Paolo, Narayan, Sundar, Jon, Martin, Edwin, and everybody else including you Krisztian for making this forum professional and useful.
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