RE: MINCIR vs CIR

From: Geert Nijs (geert.nijs@simac.be)
Date: Wed Jun 16 2004 - 05:15:35 GMT-3

Higher average bandwidth maybe ??

I know many people think that CIR is "the guaranteed rate". And, in real
life, many times, MINCIR is equal to CIR.
But, as you can read in the white paper on the internetworkingexpert
site, MINCIR is the rate at which your service provider will start
marking packets as DE.

So, the question now is: why not try to sent at a higher rate and
falling back to MINCIR when we receive BECNs ??
Suppose there is no congestion in the Frame Relay cloud of the ISP, the
ISP marks packets with DE but they don't get dropped
since there is no congestion. So we could sent at a higher rate.......

So, when the lab says "Your ISP will mark every packet above 48kbps with
the DE-bit",
then, i must correct myself, and say that 48kbps is the MINCIR.
I can try to send at a higher rate, and fall back to the MINCIR when
congestion occurs.
In this case, my CIR and the frame-relay providers CIR are
different.....
Right ?

Geert

        -----Oorspronkelijk bericht-----
        Van: Tom Rogers [mailto:cccie71@yahoo.com]
        Verzonden: woensdag 16 juni 2004 5:08
        Aan: Geert Nijs; Brian McGahan; studygroup
        Onderwerp: Re: MINCIR vs CIR

        Geert,
        If DE is going to set above minCIR, then what the point of
having cir?

        Tom

        Geert Nijs <geert.nijs@simac.be> wrote:

                I am also confused about the deliniation between CIR and
MINCIR. Can
                someone give some examples on how the lab
                would formulate these parameters ?

                If the lab specifies:
                "Your ISP provider will mark every packet above 48kbps
                with the DE-bit"

                Then CIR = 48 kbps ? Right ?

                If the lab specifies:
                "Your ISP provider will mark every packet above 48kpbs
                with the BECN-bit"
                (in the opposite direction is implicitely
                assumed here ??)

                Then MINCIR = 48 kbps ? Right ?

                Regards,
                Geert

                -----Oorspronkelijk bericht-----
                Van: nobody@groupstudy.com
[mailto:nobody@groupstudy.com] Namens Brian
                McGahan
                Verzonden: dinsdag 15 juni 2004 19:27
                Aan: studygroup
                Onderwerp: RE: Bandwidth Vs MinCIR for CBWFQ

                The MINCIR value in the frame-relay map-class is simply
used to
                define a worst case rate you will shape down to when the
BECN bit is set
                in frames you receive from the frame-relay network.

                HTH,

                Brian McGahan, CCIE #8593
                bmcgahan@internetworkexpert.com

                Internetwork Expert, Inc.
                http://www.InternetworkExpert.com
                Toll Free: 877-224-8987 x 705
                Outside US: 775-826-4344 x 705

> -----Original Message-----
> From: nobody@groupstudy.com
[mailto:nobody@groupstudy.com] On Behalf
                Of
> samccie2004@yahoo.co.uk
> Sent: Monday, June 14, 2004 12:29 PM
> To: studygroup
> Subject: Bandwidth Vs MinCIR for CBWFQ
>
> Hi Group
>
> When asked to guarantee BW foe QOS using CBWFQ on
interfaces
                encapsulated
> with frame-relay. What is the correct way to do so.
>
> Do I apply Bandwidth statement as I would for a HDLC
interafce or even

> ethernet, or do I rely on shapping DLCI with a MIncir
equal the BW
> required.
>
> TIA
>
> Sam

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