Thanks very much for this. I will read more carefully about this topic looking carefully for the words in the documentation I could not find to come with some conclusion as yours. Your answer makes sense and it is very objective and I appreaciate that because this topic has beend discussed many times here but with very loose ideas.
Do you mind sharing with us what path led you to this conclusion? Was it a document you read that explicitly said that the buffers are used to store the excess traffic and not to provide the physical " pool" of memory allocation to be used to each queue? Again I thank you for your objective and illustrative help! Daniel On Wed, Aug 4, 2010 at 1:59 AM, Wafik Maher <wafikma...@gmail.com> wrote: > Hi Daniel, > > > > I absolutely agree with you on the first part, regarding that enabling the > priority (expedite) queue will exclude queue 1 from the SRR shaping and > sharing. > > However, I don’t think that it is possible to control the bandwidth > percentages using the buffer size allocation “mls qos queue-set output 1 > buffers 10 10 26 54”, simply because of the fact that the buffer is used to > store the excess traffic when the input rate is higher than the output rate > of a certain traffic. > > > > To illustrate my point let me introduce an example > > 3750 fastethernet (100Mb) > > 10 % are allocated to priority traffic > > 50 Mb Average Total Input rate of priority traffic > > > > On the above example, at the output the priority traffic can > (theoretically) go up to full link speed 100 Mb, so apparently the input > rate is not exceeding the output rate and the average output rate would be > equal to the input which is 50 Mb (50 % not just the 10 % of the buffer > size). As a matter of fact the buffer in this case is not expected even to > fill the 10 %, it would just fill a small percent to accommodate with > traffic spikes and the small processing delay. > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > >
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