Re: MQC shape vs peak command confusion

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
> >>
> >> _______________________________________________________________________
> >> Subscription information may be found at:
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>
>
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Received on Sat Apr 04 2009 - 14:57:03 ART