I'm trying to configure QoS policy on test plateform. I have two FTP clients doing file transfert on the same server. I would like to have a different treatment between this two client. One of them would be a gold service whereas the second would have a silver service. The first client would have a better service than the other in case of congestion. So, I used drop precedence : packet from the gold client have a AF11 marking and the silver client have a AF12 marking.
I used CBWFQ as scheduling algorithme and, I allocate 45 percent of the total bandwidth for the AF1 class.
Then, I configure WRED algorithm in order to drop silver_packet before gold packet in case of congestion.
So, I put the max_threshold to 4096 and I put the indivual threshold to AF11 and AF12.
Here is the configuration :
bandwidth percent 45
random-detect dscp 10 2500 4096 5000
random-detect dscp 12 5 20 5000
Then, I performed test. My first test was in optimal use of the network (non-congestion). In this case , each FTP client have the same bandwidth (half of the maximal bandwith)
I do the same test in congestion state, but I obtained the same result, the two FTP client share equally the AF1 allocated bandwidth (45% of the total bandwidth). The two client have the same download speed. So, I can't succeed to offer better service to the gold_user.
The simpliest solution would be to separate the AF11 and AF12 classes and offer more bandwith to the AF11 classes.
But in this case , I don't use WRED algorithm. The DSCP-based WRED haven't been created for this use??!!
When you had a "congestion state", was there congestion in class af1? Such as, was the mean queue depth within that class > 20? If so, did you see tail drops for DSCP 12? If the answers for the last couple of questions were "no", then both flows within the class would get about 50% of the class bandwidth.
If the mean queue depth was only about 20 and you don't see a very high rate of tail drops for AF12, its possible that the two flows will still get about 50% of the class bandwidth.
For WRED to provide the effect you're looking for, the AF11 flow has to create enough congestion that most to all of the AF21 flow's packets are dropped.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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