From: Narbik Kocharians (narbikk@gmail.com)
Date: Mon Jun 30 2008 - 03:53:59 ART
yes based on what i am understanding.
On Sun, Jun 29, 2008 at 11:48 PM, Huan Pham <Huan.Pham@peopletelecom.com.au>
wrote:
> Hi Narbik,
>
> Thanks for your explaination. May I know what would be the best answer to
> this question. Obviously, the first part of it will be answered by bandwidth
> 128 command. I am more intrested in how you work out the parameter for the
> second part. I mean, should we leave Be, Bc default, and just configure
> shape peak with CIR = 256. Many thanks.
>
>
> "Assign WEB traffic the minimum of 128K, and allow it to peak at 512K"
>
>
> ------------------------------
> *From:* Narbik Kocharians [mailto:narbikk@gmail.com]
> *Sent:* Monday, 30 June 2008 3:40 PM
> *To:* Huan Pham
> *Cc:* ccielab@groupstudy.com
> *Subject:* Re: shape peak and shape average confusion
>
> When you need to shape the traffic, there are two types of shaping
> available to you:
>
> *Average rate shaping:* Average rate shaping limits the transmission rate
> to the CIR. Using the CIR ensures that the average amount of traffic being
> sent conforms to the rate expected by the network.
>
> *Peak rate shaping:* 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)*
>
> Remember that with Shape Peak, shaping allows the router to burst higher
> than average rate shaping. However, the traffic sent above the CIR *CAN*be dropped if the network becomes congested.
>
>
> On Sun, Jun 29, 2008 at 8:31 PM, Huan Pham <Huan.Pham@peopletelecom.com.au>
> wrote:
>
>> I am not sure about using shape peak command. Appreciate if someone can
>> share some clarification.
>>
>> The most confusing fact is that if you configure "shape peak 512000",
>> without optional Bc and Be parrameters (i.e. using default), you are
>> actually allow traffic to burst to 1024K (double the configured rate).
>>
>>
>> R5#
>> !
>> policy-map SHAPE
>> class WEB
>> shape peak 512000
>>
>> int s0/0
>> service-policy output SHAPE
>>
>> R5# sh policy-map int s0/0
>>
>> Serial0/0
>>
>> Service-policy output: SHAPE
>>
>> Class-map: WEB (match-all)
>> 0 packets, 0 bytes
>> 5 minute offered rate 0 bps, drop rate 0 bps
>> Match: protocol http
>> Traffic Shaping
>> Target/Average Byte Sustain Excess Interval
>> Increment
>> Rate Limit bits/int bits/int (ms) (bytes)
>>
>> 1024000/512000 3200 12800 12800 25 3200
>>
>>
>> Adapt Queue Packets Bytes Packets Bytes Shaping
>> Active Depth Delayed Delayed Active
>> - 0 0 0 0 0 no
>>
>> Class-map: class-default (match-any)
>> 223 packets, 2899 bytes
>> 5 minute offered rate 0 bps, drop rate 0 bps
>> Match: any
>>
>>
>>
>> So how will you best answer this question?
>>
>> Assign WEB traffic the minimum of 128K, and allow it to peak at 512K.
>>
>>
>> _______________________________________________________________________
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>>
>>
>>
>>
>>
>
>
> --
> Narbik Kocharians
> CCSI#30832, CCIE# 12410 (R&S, SP, Security)
> www.Net-Workbooks.com <http://www.net-workbooks.com/>
> Sr. Technical Instructor
>
-- Narbik Kocharians CCSI#30832, CCIE# 12410 (R&S, SP, Security) www.Net-Workbooks.com Sr. Technical Instructor
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