From: CCIE FUN (ccieexam2002@yahoo.com)
Date: Fri Mar 28 2003 - 23:49:40 GMT-3
Daniel
Be is in bits per second.
The Be value calculated by you is correct, however it
2000Bits per time interval(125ms)
so ultimately the Be for 1 sec(125 ms * 8) is
2000 * 8 = 16000bps.
Yes you can only burst for the first time interval
however if you use the value of 2000
then here is what is transmitted in 1sec
2000(be)+6000(bc)=8000-1st time interval
(125ms)
6000(bc)--2nd time interval(125ms)
6000(bc)--3nd time interval(125ms)
6000(bc)--4th time interval(125ms)
6000(bc)--5th time interval(125ms)
6000(bc)--6th time interval(125ms)
6000(bc)--7th time interval(125ms)
6000(bc)--8th time interval(125ms)
so the total is 50Kbps
But the port speed is 64Kbps this means we can burst
upto 64Kbps. so how do i get to that?
My understanding was that the router will send
send the full Be amount during the first time
interval.
and remaining 7 time interval it will be only Bc.
so adding all that i get the net result of 64000.
i am getting too confused with this now.i hope my
understanding is correct.
because i have been getting varying solutions for this
one.
--- Daniel Cisco Group Study <danielcgs@imc.net.au>
wrote:
> Shouldn't be=2000 ?
>
> (AR - CIR) / 8
>
> (64000 - 48000) / 8
>
> You are using a 125ms time interval, and you can
> only burst in the first one. Also, be is in bits,
> not bps.
>
> Daniel
>
> -----Original Message-----
> From: CCIE FUN [mailto:ccieexam2002@yahoo.com]
> Sent: Saturday, 29 March 2003 02:54
> To: ccielab@groupstudy.com
> Subject: Traffic-shaping question
>
>
> Hello all,
> I have traffic-shaping question and i have also
> mentioned the solution i used.
>
> please help me out to identify if it's correct and
> what commands are useful to determine that the
> traffic
> shaping is going to work as configured.
>
> Here is the question:
> 1.The router R5 has two PVC's going R1 and R13 each
>
> has CIR of 48Kbps and burst size of 64Kbps.
>
> 2. The circuit from R5 to the frame-relay switch is
> provisioned at a speed of 64Kbps.
>
> 3. If BECN's are recieved, R5 needs to throttle back
>
> back the PVC's to 32Kbps.
>
> 4. Using CIR, Bc and Be configure traffic-shaping on
>
> R5.
>
> Now here is my config for Router R5 relevant to
> Traffic-shaping. I have not shown any frame-maps or
> IP
> information for clarity purposes.
>
> !
> interface s0
> encap fram
> no arp fram
> no fram inv
> frame-relay traffic-shaping
> frame-relay class Shape
> !
> map-class frame-relay Shape
> frame-relay cir 48000
> frame-relay bc 6000
> frame-relay be 16000
> frame-relay mincir 32000
> frame-relay adaptive-shaping becn
>
>
>
> Now my question is do i need to configure R1 and R13
> for shaping even if it is not mentioned in the
> Question.
>
> Also is my solution correct.
>
>
> Thanks for your help.
>
> __________________________________________________
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