From: Chris Lewis (chrlewiscsco@gmail.com)
Date: Mon Dec 12 2005 - 11:24:29 GMT-3
A slight modification.
While average rate, target rate and CIR are all used interchangeably, line
rate is something else as I'm sure you know.
You are correct that Be is defined by how you configure the CLI.
On 12/12/05, Nawaz, Ajaz <Ajaz.Nawaz@bskyb.com> wrote:
>
> Chris
>
> I've read your email along with the reply from Bob Sinclair. I now have a
> rephrased question:
>
> In terms of the rate-limit interface config command; Line rate, average
> rate, target rate and CIR are all of one and represented in bps - is this
> correct?
>
> Depending on QoS policy 'Be' may or may not be 2*Bc
> We can use the example of an 25mb OC3 provided with a in/out burst
> capability of 30mb but anything over 30mb must be dropped. According to
> 'Administering Cisco QoS' pg192 the config should look like this:
>
> Rate-limit input 25000000 30000 30000 conform-action transmit
> exceed-action
> drop
> Rate-limit output 25000000 30000 30000 conform-action transmit
> exceed-action
> drop
>
> Unless this is a mistake 'Be' does not equate to 2*Bc and instead is
> determined by the QoS policy itself.
>
> Rgrds
> Ajaz Nawaz
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Chris Lewis
> Sent: 10 December 2005 16:40
> To: Nawaz, Ajaz
> Cc: ccielab@groupstudy.com
> Subject: Re: rate-limit average bps
>
> Ajaz,
>
> You'll have to help me with the wording a little more. The average rate is
> the target or CIR you want to police to over time. Are you saying you want
> to set the CIR to 0 in the police statement and rely upon Bc and Be to
> allow
> traffic through? If so I don't think that will work.
>
> For the policing algorithm (rate-limit is basically the same in this
> respect), tokens are placed in the bucket according to the formula
> (T-T1)*target rate. So if the target rate is zero, no tokens get in the
> bucket and nothing is passed.
>
> Chris
>
>
> On 12/10/05, Nawaz, Ajaz <Ajaz.Nawaz@bskyb.com> wrote:
> >
> > Dear Group,
> >
> > <
> >
>
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fqo
> > s_r/qrfcmd8.htm#wp1037428>
> >
> > "bps - Average rate, in bits per second (bps). The value must be in
> > increments of 8 kbps."
> >
> > I want to rate-limit http traffic but only have burst-normal and
> burst-max
> > figures stipulated. How does one come about the 'average rate (bps)'?
> >
> > Tia
> > Ajaz Nawaz
> >
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