From: Aidan Marks (amarks@cisco.com)
Date: Sun Feb 23 2003 - 04:50:21 GMT-3
At 03:15 PM 23/02/2003, Daniel Cisco Group Study wrote:
>I would have chosen the following parameters:
>
>frame-relay cir 9600 (in bits/s)
>frame-relay bc 1200 (in bits) -->( cir/8 )
>frame-relay be 2400 (in bits) -->( 19200 / 8)
>
>I have assumed a time interval of 125ms.
>
>So, if the burst is 19600 bits per second, then be=19200 x 0.125 = 2400.
>
>ie, the frame-relay interface would transfer at 9600 + 19200 = 28800
>bits/s in the first Tc.
>
>Anyone second this?
I disagree with the config. You don't divide by 8 for the Be CLI
value. You can prove this by analysing the show traffic-shape output.
Aidan
>Daniel
>
>
>-----Original Message-----
>From: Sage Vadi [mailto:sagevadi@yahoo.co.uk]
>Sent: Saturday, 22 February 2003 13:09
>To: ccielab@groupstudy.com
>Subject: FRTS: Bc & minCIR
>
>
>All,
>
>Q) Configure your frame-relay network to have a
>committed information rate of 9,600 bps and a burst
>size of 19,200 bps.
>
>So would this be correct - ?
>
>frame-relay CIR 9600
>frame-relay Bc 9600
>
>The Bc figure is what I am concerned about. Reading
>the documentation, CCO states the peak is = CIR + Be.
>Therefore that would mean CIR=9600 + Be = 19200, so I
>arrived @ Bc figure of 9600.
>
>Also in the traffic-rate command it is explained that
>the Be value is calculated from subracting the average
>from the peak. In my case average would be 9600, minus
>this from a peak of 19200 would also equal 9600.
>
>Furthermore I have a question about minCIR - according
>to CCO, "rate values greater than 2048 must be entered
>with trailing zeros. For example, 2048000 and 5120000"
>- what on earth does that mean? And why do you have to
>do this???
>
>Lastly if the minCIR value cannot be supported, the
>call is cleared (direct quote CCO). Does this mean
>that CIR by itself is not as stringent as the minCIR,
>so that would mean CIR does some negotiation with the
>endpoint - how does this work?
>
>rgds,
>Sage
>
>
>
>
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