Re: MQC shape vs peak command confusion

Thanks Raman.

Salah,
If the task asks to shape to peak rate of 128kbps, giving "shape peak
128000" makes Be = Bc. Hence Peak rate = 128000 * 2 = 256000. I am left with
only one correct solution "shape peak 64000 6400 6400". In this case, Bc=Be
and hence PIR = 64kbps * 2 = 128kbps.

Regards.
-Naveen.

On Sat, Apr 4, 2009 at 12:57 PM, Ramanpreet Singh
<sikandar.raman_at_gmail.com>wrote:

> Naveen,
>
> It all depends on the method you are using for configuring FRTS.
>
> If you are using a legacy method then by default Be=0
>
> You can try this by configuring multiple map statements on a frame
> interface and then by enabling frame-relay traffic-shaping.
>
> when you will do show traffic-shape. You will see Be is set to 0 by
> default.
>
> In class based FRTS. Bc=Be ( if not set)
>
> HTH
> Raman
>
>
>
>
> On Sat, Apr 4, 2009 at 2:04 PM, naveen M S <navin.ms_at_gmail.com> wrote:
>
>> Thanks everyone. If I want to achieve peak rate of 128kbps, I still have
>> many choices.
>>
>> 1) Keep CIR = 128kbps and Be = 0. This makes PIR = CIR = 128kbps
>> 2) Keep CIR = 85kbps and Be = Bc / 2. This makes PIR = 128kbps
>> 3) Keep CIR = 64kbps and Be = Bc. This makes PIR = 128kbps .. etc.
>>
>> In the lab if the task doesn't say anything about Be, should I assume Be =
>> 0
>> or Be = Bc ?
>>
>> Regards,
>> Naveen.
>>
>> On Sat, Apr 4, 2009 at 11:34 AM, Salah ElShekeil
>> <salah.elshekeil_at_gmail.com>wrote:
>>
>> > be aware that the shape peak formula is not the same as the shaping
>> formula
>> >
>> >
>> >
>> > shape peak
>> >
>> >
>> >
>> > peak rate = CIR(1 + Be / Bc)
>> >
>> >
>> >
>> > shape average (CIR) = bc*1000/tc
>> >
>> >
>> >
>> > HTH
>> >
>> >
>> >
>> > Salah
>> >
>> >
>> >
>> > On Sat, Apr 4, 2009 at 4:40 PM, Ruhann <groupstudy_at_ru.co.za> wrote:
>> >
>> >> Mr Petr wrote a great article about the shape peak command:
>> >>
>> >>
>> >>
>> http://blog.internetworkexpert.com/2008/08/26/understanding-the-shape-peak-command/
>> >>
>> >> On Sat, Apr 4, 2009 at 6:27 AM, naveen M S <navin.ms_at_gmail.com> wrote:
>> >>
>> >> > Group,
>> >> >
>> >> > Here is my task :
>> >> >
>> >> > 1) Shape HTTP traffic to a peak rate of 128kbps sent out to Vlan 34.
>> >> > 2) Use Bc and Be bursts based on 10ms interval.
>> >> >
>> >> > *My solution was -*
>> >> >
>> >> > class-map HTTP
>> >> > match protocol http
>> >> > policy-map SHAPE
>> >> > class HTTP
>> >> > * shape peak 128000 1280 0*
>> >> > interface gig 0/0
>> >> > service-policy output SHAPE
>> >> >
>> >> > Rack1R1(config-pmap-c)#* do sh policy-map int gig0/0*
>> >> > Target/Average Byte Sustain Excess Interval
>> >> Increment
>> >> > Rate Limit bits/int bits/int (ms)
>> (bytes)
>> >> > 128000/128000 160 1280 0 10 160
>> >> >
>> >> > *The workbook solution was -*
>> >> >
>> >> > class-map HTTP
>> >> > match protocol http
>> >> > policy-map SHAPE
>> >> > class HTTP
>> >> > * shape peak 64000 6400 6400*
>> >> > interface gig 0/0
>> >> > service-policy output SHAPE
>> >> >
>> >> > Rack1R1(config-pmap-c)# *do sh policy-map int gig0/0*
>> >> > Target/Average Byte Sustain Excess Interval
>> >> Increment
>> >> > Rate Limit bits/int bits/int (ms)
>> (bytes)
>> >> > 128000/64000 1600 6400 6400 100 1600
>> >> >
>> >> > What difference it makes to the peak output rate when either of the 2
>> >> > statements are given ?
>> >> >
>> >> > 1) shape peak 128000 1280
>> >> > 2) shape peak 64000 6400 6400
>> >> >
>> >> > Thanks,
>> >> > Naveen.
>> >> >
>> >> >
>> >> > Blogs and organic groups at http://www.ccie.net
>> >> >
>> >> >
>> _______________________________________________________________________
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>> >> >
>> >> >
>> >> >
>> >> >
>> >> >
>> >> >
>> >> >
>> >> >
>> >>
>> >>
>> >> --
>> >> <ruhann>
>> >>
>> >>
>> >> Blogs and organic groups at http://www.ccie.net
>> >>
>> >> _______________________________________________________________________
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Received on Sat Apr 04 2009 - 13:17:59 ART