From: ian (iyux2000@gmail.com)
Date: Thu Mar 29 2007 - 04:29:34 ART
maureen schaar,How are you#!
From my experience, i remeber that BC=BE,be=0.
Therefore, cisco recommends BE= 2 * BC. And i reckon that the "be" value in shape average and peak is not the real BE, it is BE+BC.
======= 2007-03-29 17:09:48 What you've mentioned in your letter#:=======
>I know I can manually set the Be to 0 with shape average, but the
>thing that confuses me is that it is actually possible to have a Be
>with shape average.
>
>Compare the output from show policy-map int for average and peak:
>
>AVERAGE:
> Traffic Shaping
> Target/Average Byte Sustain Excess Interval Increment
> Rate Limit bits/int bits/int (ms) (bytes)
> 256000/256000 8000 32000 32000 125 4000
>
>PEAK:
> Traffic Shaping
> Target/Average Byte Sustain Excess Interval Increment
> Rate Limit bits/int bits/int (ms) (bytes)
> 512000/256000 8000 32000 32000 125 8000
>
>With average I see the target rate is 256000, whereas with peak
>shaping I see it can peak to 512000 (for both the cir is 256000). But
>what do the excess bits with shape average mean? I don't think these
>bits can actually be sent, or can they?
>
>If I set the Be manually to 0, the output for AVERAGE changes to this:
> Traffic Shaping
> Target/Average Byte Sustain Excess Interval Increment
> Rate Limit bits/int bits/int (ms) (bytes)
> 256000/256000 4000 32000 0 125 4000
>
>So what is exactly the difference between:
>
>shape average 256000 32000 0
>and shape average 256000 32000
>
>with regards to how much traffic can be sent?
>
>Maureen
>
>On 3/29/07, Blastmor <alextols@gmail.com> wrote:
>> Shape peak is rather useless now.
>>
>> The case when you can use it, for instance, is when provider allows you to
>> burst but you are warned that your traffic can be dropped at any time (when
>> ISP is congested) --> so you can use it when your traffic is
>> "steady" for jitter and losses(FTP, SMTP and so on)
>>
>> HTH
>>
>> 2007/3/29, Gary <liguoyi8@gmail.com>:
>> > I am confused by average & peak too.
>> > According to DocCD, the syntax is : shape peak cir
>> > By default be=bc. So the target rate is two times cir.
>> > So when should we use "shape peak" and when should we use "shape average"?
>> >
>> >
>>
>>
>> SY, Alexey
>
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!!!!!!!!!!!!!!!!Have a nice day.
!!!!!!!!!!!!!!!!ian
!!!!!!!!!!!!!!!!iyux2000@gmail.com
!!!!!!!!!!!!!!!!!!!!2007-03-29
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