From: Josh (shmokin@gmail.com)
Date: Sat Jun 23 2007 - 15:52:23 ART
This was explained pretty good on a previous post, below are the details
provided by bee
>> > > On 4/14/07, WorkerBee <ciscobee@gmail.com> wrote:
>> > >>
>> > >> Specifying Average Rate or Peak Rate Traffic Shaping Design Rule
>> > >> ================================================
>> > >>
>> > >> Traffic shaping limits the rate of transmission of data.
>> > >>
>> > >> You can specify two types of traffic shaping; average rate shaping
>> > >> and
>> > >> peak rate shaping. Average rate shaping limits the transmission rate
>> > >> to the committed information rate (CIR). Using the CIR ensures that
>> > >> the average amount of traffic being sent conforms to the rate
>> > >> expected
>> > >> by the network.
>> > >>
>> > >> Peak rate shaping configures the router to send more traffic than
>> > >> the
>> > >> CIR. To determine the peak rate, the router uses the following
>> > >> formula:
>> > >>
>> > >> peak rate = CIR(1+Be/Bc) >> peak = CIR + [Be/Tc] which is more
>> > >> than
>> > >> CIR.
>> > >>
>> > >> where:
>> > >>
>> > >> Be is the Excess Burst rate.
>> > >>
>> > >> Bc is the Committed Burst rate.
>> > >>
>> > >> Peak rate shaping allows the router to burst higher than average
>> > >> rate
>> > >> shaping. However, using peak rate shaping, the traffic sent above
>> > >> the
>> > >> CIR (the delta) has the potential of being dropped if the network
>> > >> becomes congested.
>> > >>
>> > >> If your network has additional bandwidth available (over the
>> > >> provisioned CIR) and the application or class can tolerate
>> > >> occasional
>> > >> packet loss, that extra bandwidth can be exploited through the use
>> > >> of
>> > >> peak rate shaping. However, there may be occasional packet drops
>> > >> when
>> > >> network congestion occurs. If the traffic being sent to the network
>> > >> must strictly conform to the configured network provisioned CIR,
>> > >> then
>> > >> you should use average traffic shaping.
>> > >>
>> > >> R6(config-pmap-c)#shape ?
>> > >>
>> > >> average configure token bucket: CIR (bps) [Bc (bits) [Be
>> > >> (bits)]],
>> > >> send out Bc only per interval
>> > >>
>> > >> peak configure token bucket: CIR (bps) [Bc (bits) [Be
>> > >> (bits)]],
>> > >> send out Bc+Be per interval
On 6/23/07, Adham Ali <adhamccie@yahoo.com> wrote:
>
> Dear all,
>
> I am a bit confused about when to used shape Average and when to use
> shape peak...
> As far as i understande "average" means to send Bc every Tc while Peak
> means to send Bc+Be every Tc....
>
> Please don't provide me links to read because i have alot:))...... i just
> want to know when to use each option and what are the keywards for each
> option....
>
> Thank you in advance!
>
> Regards,
> Adham...
>
>
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This archive was generated by hypermail 2.1.4 : Sun Jul 01 2007 - 17:24:51 ART