From: John Underhill (stepnwlf@magma.ca)
Date: Wed Jun 16 2004 - 13:37:39 GMT-3
correction.. (and not many providers are NOT using cisco lmi, because they
have to maintain
vendor neutral standards..).
----- Original Message -----
From: "John Underhill" <stepnwlf@magma.ca>
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 12:19 PM
Subject: Re: MINCIR vs CIR
> For one thing, it is unlikely that you will see mincir as part of your
SLA,
> the switch does not know what you have set mincir to, or how your router
> will react to becns, but only drops traffic when it exceeds a certain
rate,
> (and not many providers are using cisco lmi, because they have to maintain
> vendor neutral standards..). Mincir is not part of the lmi exchange
> standard, because it is a local, discretionary value. If you have
purchased
> 128k, and they start dropping traffic at 64k, it's time to put your
yelling
> hat on and call the provider.
> CIR = the bandwidth you have purchased.
> FRF NNI agreement standard:
> http://www.mplsforum.org/frame/Approved/FRF.2/FRF_2_2-final.pdf
>
> <Cisco Quote:>
> When the congestion level exceeds a configured value called queue depth,
the
> sending rate of all PVCs is reduced to the minimum committed information
> rate (minCIR). As soon as interface congestion drops below the queue
depth,
> the traffic-shaping mechanism changes the sending rate of the PVCs back to
> the committed information rate (CIR). This process guarantees the minCIR
for
> PVCs when there is interface congestion.</Quote>
> Seems pretty plain to me.. Mincir is a congestion control mechanism.
>
http://www.cisco.com/en/US/products/sw/iosswrel/ps1839/products_feature_guide09186a0080087b91.html
>
> Here is a good explaination of how frame is working, including all the
> standards, note in an illustration of an lmi frame, there is no 'mincir'
> field.
> http://www.protocols.com/pbook/frame.htm
>
>
>
> ----- Original Message -----
> From: "Geert Nijs" <geert.nijs@simac.be>
> To: "Tom Rogers" <cccie71@yahoo.com>; "Brian McGahan"
> <bmcgahan@internetworkexpert.com>; "studygroup" <ccielab@groupstudy.com>
> Sent: Wednesday, June 16, 2004 4:15 AM
> 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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