From: John (jgarrison1@austin.rr.com)
Date: Sun May 04 2008 - 16:15:38 ART
Be = AIR -CIR/Tc. Tc will default to 125 ms, but setting the Bc value may
or may not change the Tc value. Tc=Bc/CIR or for the example
64000/512000=.125. You can also double check the Tc value Tc intervals per
second= CIR/Bc or for your example 512000/64000= 8 Tc intervals a second,
which is .125 ms. For some strange reason I find it easier to configure the
Tc using CIR/Bc, but to each their own.
----- Original Message -----
From: "Carlos Trujillo" <carlos.trujillo.jimenez@gmail.com>
To: "Andy Cole" <Andy.Cole@foremostfarms.com>
Cc: "Cisco certification" <ccielab@groupstudy.com>
Sent: Sunday, May 04, 2008 11:47 AM
Subject: Re: No bursts allowed
> Andy.
>
> The bc value is the number of commited bits to be sent every TC interval,
> which by default the TC interval is 125.
> The bc is NOT above the CIR, the BE is above the cir.
>
> BE = EXCESS = ABOVE CIR.
>
>
> 2008/5/4 Andy Cole <Andy.Cole@foremostfarms.com>:
>
>> Just completed a vendor practice lab, task stated: Shape the traffic
>> on the circuit between R2 and R3 to 512kbps. Do not allow any bursts
>> above the subscribed CIR.
>>
>> The answer had configured:
>>
>> frame-relay cir 512000
>> frame-relay bc 64000
>>
>> bc is 'committed burst' when we configure frame-relay bc 64000 aren't we
>> configuring a burst?
>>
>> Not sure how to understand the task and answer.
>>
>> Andy
>>
>>
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>
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