QOS Question ????

Unanswered Question
Dec 24th, 2008

What is the differnce between "shape average" & "shape peak" in QOS shaping ??

does it use the same concepts of burst conform & burst exceed as in policing .

Kindly explain with a example !!!

I have this problem too.
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Joseph W. Doherty Wed, 12/24/2008 - 04:32

"does it use the same concepts of burst conform & burst exceed as in policing"

Yes, the difference being over rate traffic being queued rather than dropped.

ryel.dsouza Wed, 12/24/2008 - 04:43

i got it ??? that policing sort of cuts traffic when the limit set is reached but shaping queus excess traffic in its buffers but how is "shape average" & "shape peak" different

Joseph W. Doherty Wed, 12/24/2008 - 05:53

"Peak" allows a 2nd measurement interval that's added to the first. This allows a traffic burst to pass through the shaper (or policer). Sustained traffic rate would be controlled by the "average" rate.

Peak vs. average isn't quite as important to shaping as it is to policing since packets are queued not discarded. Yet, could still be used for a combination of multiple small flows all hitting the shaper at the same time. Their overall average rate might be well within the average setting but perhaps you don't want to queue the small burst. (E.g. remote desktop)

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