RE: LLQ & Burst

From: Primetek_Easyman (easyman@primetek.com.tw)
Date: Mon Dec 12 2005 - 01:48:05 GMT-3

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Hi, Chris
Thanks for the clarification.

Regards,

Lin
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Chris Lewis
Sent: Sunday, December 11, 2005 10:56 PM
To: Primetek_Easyman
Cc: ccielab@groupstudy.com
Subject: Re: LLQ & Burst

Hi there,

The question is incorrrect. One cannot specify a rate as a burst parameter,
the burst is in bytes. If the question is re-phrased to say allow 64000 bits
of burst if there is credit, this is 8000 bytes. Or if it said allow XYZ
milliseconds of burst, you'd use the 256kbps rate figure to work out how
many bytes you could transmit in th amount of milliseconds, make sense?

Chris

On 12/11/05, Primetek_Easyman <easyman@primetek.com.tw> wrote:
>
> Hi, Groups
>
> I have a question about LLQ and burst parameter.
> I've read the CCO Docs about this, but still not sure if it's right?
> The url as following:
>
>
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/qos_
> r/qos_o1g.htm#wp1076758
>
> From the url I know that we can use additional parameter "burst" along
> with
> "priority" command.
> priority {bandwidth-kbps | percent percentage} [burst]
>
> Description of "burst "
> (Optional) Specifies the burst size in bytes. The burst size configures
> the
> network to accommodate temporary bursts of traffic. The default burst
> value,
> which is computed as 200 milliseconds of traffic at the configured
> bandwidth
> rate, is used when the burst argument is not specified. The range of the
> burst is from 32 to 2000000 bytes.
>
>
> So my question is, if the question asked about to give priority for some
> traffic (eg: voip traffic) upto 265Kbps bandwidth and allow burst of
> 64Kbps.
>
> Then the command should be "priority 256 1600". (based on 200ms )
> Or
> It should be "priority 256 8000" (base on 1000ms)
>
> Hope some one can clarify this for me?
> TIA.
>
> Lin
> 12/11/05
>
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