From: farid khwaja (faridkhwaja@yahoo.com)
Date: Fri Nov 18 2005 - 15:29:54 GMT-3
Zuke,
I think the solution to this looks like this:
AR 256 Kbps------------We cannot interpret this as the
CIR.
TC Value is 125ms.---- No issues about this
Min CIR= 56kbps ------ As During congestion the
provideer will
mark excess with 56 kbps with
DE
CIR is what is not given here and hence we need to
find the value of CIR and subsequently Bc.
If you leave it to defaults CIR is 56kbps
If you have the CIR details from provider then use
that value
If you are using voice traffic CIR=Mincir
In case you dont have any information from your
carrier you can make a choice from two assumptions:
1. CIR=AR=256kbps
2. CIR=2xMinCIR=112kbps
The second one is more preferrable, but I think you
will need to fine tune between the two based on
performance...
http://www.cisco.com/warp/public/125/traffic_shaping_6151.html
from the link.............
frame relay cir
The average rate you want to send traffic out on a
given PVC in bps. This is generally higher than the
guaranteed rate but less than the access rate (AR). It
equals the guaranteed rate only if:
The service provider does not allow you to send above
guaranteed rate.
The physical line rate on the interface is same as the
guaranteed rate.
There are Voice (voice over IP [VOIP] or voice over
Frame Relay [VOFR]) packets on this PVC, therefore you
cannot afford dropped packets for quality or service.
The value of the CIR is 56000 bps is by default.
================================================================
--- Victor Cappuccio <cvictor@protokolgroup.com>
wrote:
> Hola Zuke..
>
> Take a look Here...
>
>
http://www.internetworkexpert.com/resources/01700368.htm
>
> So my understanding from your email is. That the AR
> = CIR = 256Kbps, and the
> MINCIR = 56kbps
> Using the formulas
>
> Be = (AR - CIR ) * Tc / 1000
>
> Bc = (Cir*tc)/1000
>
> You can get the corresponding values, for the
> map-class
>
http://www.cisco.com/en/US/products/sw/iosswrel/ps1828/products_configuratio
> n_guide_chapter09186a00800ca5a1.html
>
> HTH
> Victor
>
> INTERNETWORK EXPERTS ROCKS!!!
>
> ----- Original Message -----
> From: "Zukque" <zukque@gmail.com>
> To: "Cisco certification" <ccielab@groupstudy.com>
> Sent: Thursday, November 17, 2005 7:59 PM
> Subject: Maximum Throughput???
>
>
> > Hey Guys, I been searching high and low, for
> Frame-relay RATE LIMITING...
> > Suppose you have 256 Kbps as the maximum
> Throughput
> > Your TC Value is 125ms
> > During congestion the provideer will mark excess
> with 56 kbps with DE..
> > This one got me thinking ...
> > So my Access Rate would be 256, the Cir will be 56
> ?
> > Please shed a light in my darkness
> > Thanks
> > Zuke!
> >
> >
>
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