From: Petr Lapukhov (petrsoft@gmail.com)
Date: Sun May 07 2006 - 09:26:52 ART
Hello Dave,
Here is the reference at cisco.com, that I found quite useful to understand
how CAR
actually works:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/12cgcr/qos_c/
qcpart4/qcpolts.htm#xtocid241935
As for recommended burst values, i took them from command reference:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124tcr/tqos_r
/qos_q1ht.htm#wp1080850
HTH
Petr
2006/5/7, Schulz, Dave <DSchulz@dpsciences.com>:
>
> Petr -
>
> Would you mind providing an example? I am not quite following the normal
> burst formulae. Is the configured rate the CIR? Thanks for your help.
>
> dave
>
> ________________________________
>
> From: nobody@groupstudy.com on behalf of Petr Lapukhov
> Sent: Sun 5/7/2006 3:24 AM
> To: george stanza
> Cc: Cisco certification
> Subject: Re: question on CAR rate-limit
>
>
>
> George,
>
> There is no "universal formula" for calculating rate-limit (CAR) bursts.
> However, there are some "best-practice" recommendations rate-limit
> parameters:
>
> normal burst = configured rate * (1 byte)/(8 bits) * 1.5 second
> extended burst = 2 * normal burst
>
> They are mostly targetted to work with "adaptive" (TCP) flows.
>
> CAR produces a sort of "RED behavior" when configured with
> "extended burst". (This behavior changed with "policy" command)
>
> HTH
> Petr
>
> 2006/5/7, george stanza <cert2006@gmail.com>:
> >
> > hello,
> >
> > I am trying to understand the 'burst-normal' and 'burst-max' parameters
> > in
> > the CAR rate-limit. The syntax says
> >
> > rate-limit {input|output} [access-group [rate-limit] acl-index] bps
> > burst-normal burst-max conform-action action exceed-action action
> >
> > now, if the max limit is 184kbps and the normal burst size is 4kbps..
> How
> > do
> > i calculate the burst-normal and burst-max ?
> >
> > //G
> >
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