From: Joe Chang (changjoe@earthlink.net)
Date: Wed Jun 16 2004 - 13:53:28 GMT-3
In my opinion, no, because if the FR network is really messed up, how could
the FR provider even guarantee the MinCIR? It's not like ATM, in which the
circuit set-up process can complete only if every switch in the path can
guarantee the requested service level.
My response to your specific scenario would be to do a CIR of 64 kbps, Bc of
1000 bytes , Be of 3000 bytes. This would let you burst up to 256 K every so
often. I would set the MinCIR to 64 kpbs - it's the provider's job to live
up to their guarantee.
----- Original Message -----
From: "Rohan Grover" <rohang@cisco.com>
To: "'Geert Nijs'" <geert.nijs@simac.be>; "'Tom Rogers'"
<cccie71@yahoo.com>; "'Brian McGahan'" <bmcgahan@internetworkexpert.com>;
"'studygroup'" <ccielab@groupstudy.com>
Sent: Wednesday, June 16, 2004 12:06 PM
Subject: RE: MINCIR vs CIR
> Hi,
>
> Just to continue on this thread...if a scenario asks for the following
> 1)FR service provider guarantees 64Kbps
> 2)FR link capacity provided by SP is 256 Kbps.
>
> I would set it as follows
>
> MinCIR = 64 Kbps
> CIR = 256 Kbps
> Bc = 32 Kb
> Be = 0 (not asked for)
>
> Would this be right?
>
> Thanks
> Rohan
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Geert Nijs
> Sent: Wednesday, June 16, 2004 1:46 PM
> To: Tom Rogers; Brian McGahan; studygroup
> Subject: RE: MINCIR vs CIR
>
>
> 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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