From: akyccie (akyccie@gmail.com)
Date: Thu May 29 2008 - 01:08:27 ART
Thanks Leo, I guess your are right here.
----- Original Message -----
From: "Leo Leung" <leo0430453@gmail.com>
To: "akyccie" <akyccie@gmail.com>
Cc: "Cisco certification" <ccielab@groupstudy.com>
Sent: Wednesday, May 28, 2008 11:47 PM
Subject: Re: frame relay shaping
> this is a typical scenario where cir=mincir (by default mincir = 1/2
> cir). AR 256k may be cir only when there's no congestion, but the
> question clearly points "Make sure your throughput changes accordingly
> based upon BECN's received". This means cir will become 64k when
> congestion occurs. and BE is needed to utilize maximal throughput:
>
> cir = 64000
> bc = TC*cir = 125ms * 64000 = 8000
> bc+be = TC*AR = 125ms * 256000 = 32000
> be = 32000 - 8000 = 24000
>
> map-class frame-relay SHAPE
> frame-relay cir 64000
> frame-relay mincir 64000
> frame-relay bc 8000
> frame-relay be 24000
> frame-relay adaptive-shaping becn
> !
> int s1/0
> frame-relay traffic-shaping
> frame-relay class SHAPE
>
> thanks,
> Leo
>
>
> On 5/27/08, akyccie <akyccie@gmail.com> wrote:
>> Question regd the frame relay shaping.
>> Maximum throughout given is 256kbps. During congestion your provider will
>> mark
>> any traffic in excess of 64kbps as discard eligible. Make sure your
>> through
>> put changes accordingly based upon BECN's received. Token bucket interval
>> is
>> 125ms.
>>
>> Is it the right answer
>>
>> map-class frame-relay SHAPE
>> frame-relay cir 256000
>> frame-relay mincir 64000
>> frame-relay bc 32000 (Bc = Tc * cir --> 0.125 * 256000 )
>> frame-relay be 4000 (air - cir * Tc / 8 Bytes --> 256000 * 0.125 / 8)
>> frame-relay adaptive-shaping becn
>> !
>> int s1/0
>> frame-relay traffic-shaping
>> frame-relay class SHAPE
>>
>>
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