From: darth router (darklordrouter@gmail.com)
Date: Tue Jul 03 2007 - 05:42:46 ART
"2) Shape Peak: Within each Tc the router sends up to Bc+Be of data, (if
all the Bc was not used in previous Tcs) and buffers the rest for the
next Tc."
I thought this is the same as shape average with Be defined. I was under the
impression that shape peak will send Bc + Be every interval. e.g. the
buckets fill up every interval (not dependent on Bc leftover to overflow
into Be), and if the receiving end cannot handle it, packets will drop. Is
this correct? If this is true, is there any difference from shaping peak, to
just shaping average to a higher rate (same total value as you would have
used with peak). Could you clarify? Thanks,
DR
On 7/3/07, Narbik Kocharians <narbikk@gmail.com> wrote:
>
> I totally agree with you, many people take this bucket concept too far. I
> think your generalization is pretty accurate.
>
>
> On 7/2/07, Mike Kraus (mikraus) <mikraus@cisco.com> wrote:
> >
> > Scott Morris had once made mention that the whole token bucket metaphor
> > was induced by mind-expanding agents, and I am learning to agree. :)
> >
> > If I ignore the whole bucket concept:
> >
> > 1) Shape Average: Within each Tc the router sends Bc worth of data, and
> > buffers the rest for the next Tc.
> > 2) Shape Peak: Within each Tc the router sends up to Bc+Be of data, (if
> >
> > all the Bc was not used in previous Tcs) and buffers the rest for the
> > next Tc.
> > 3) Police: As Bc is exceeded, packets are dropped.
> > 4) Police Peak: As Bc exceeded, managed discard is used up till Be.
> > After Be, packets are dropped.
> >
> > By no means is the above all explicitly accurate, but it is a broad
> > generalization that has kept me sane. If anyone has any
> > suggestions/comments on the above, I would love to hear it!
> >
> > Here are a couple good pages I've found useful:
> > http://www.cisco.com/en/US/tech/tk543/tk545/technologies_tech_note09186a
> > 00800a3a25.shtml
> > http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/12cgcr/q
> > os_c/qcpart4/qcpolts.htm
> >
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto: nobody@groupstudy.com] On Behalf Of
> > darth router
> > Sent: Monday, July 02, 2007 9:23 PM
> > To: ccielab@groupstudy.com
> > Subject: Shape/Police Peak
> >
> > Ok guys,
> >
> > I know this has probably been beaten to death by now, but I have been
> > twisting my brain around it for days. Reading and reading, and I think I
> > am finally starting to grasp the concept.
> >
> >
> > When you police peak, you can only take tokens out of one bucket per
> > interval, correct? If CIR is not enough, you jump to the Tp bucket,
> > which creates the exceed action, righto?
> >
> > With shape peak, you can transmit from both buckets per interval?
> >
> >
> > DR
> >
> > _______________________________________________________________________
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> >
> > _______________________________________________________________________
> > Subscription information may be found at:
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> >
>
>
>
> --
> Narbik Kocharians
> CCIE# 12410 (R&S, SP, Security)
> CCSI# 30832
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