From: MADMAN (dave@xxxxxxxxxxxxxx)
Date: Thu Jun 20 2002 - 15:45:53 GMT-3
Anthony Pace wrote:
>
> I also keep seeing this reference to setting the CIR to the port speed
> in all the CCO an in all the books and in these posts. I guess I will
> adhere to this in the lab since I am seeing that this CCIE effort is
> more theory than practical, however, what I have observed in real life
> is that traffic shaping is used when many, many logical circuits
> inhabit a phisical link (ATM or FRAME). In the case of frame-relay, if
> the hub has 1544 kbps and 8 pvc's with 8 class's and each spoke has 64k
> on each of their circuits,how can the CIR be 1544 on every map class.
> Isn't the idea to carve up the bandwidth amongst the spokes?
>
If you have a 1.544M circuit and you configure FRTS CIR for say 128K
you will have effectively limited yourself to a max of 128K and will not
be able to burst at a higher rate. Yes you want to shape when needed
but you also want to burst when the bandwidth is available.
Dave
> Anthony Pace
>
> On Thu, 20 Jun 2002 22:31:25 +0800 (HKT), "Katson Yeung"
> <kyeung@mail.hkcix.com> said:
> > Thanks Mamoor, that is correct.
> >
> > One more question about the CIR.
> >
> > According to all the materials I read, the recommended value for CIR is
> > set it to Access-rate. So, there is a question:
> >
> > R1s0 ------ FR -------- s0R2
> >
> > R1s0 = 1.544Mbps
> > R2s0 = 128kbps
> > CIR = 64k. (I know it is = mincir, irrelevent to the question, but list
> > it
> > out anyway.)
> >
> >
> > At R1,
> > should I set the CIR as 1544000 or 128000?
David Madland
Sr. Network Engineer
CCIE# 2016
Qwest Communications Int. Inc.
dave@interprise.com
612-664-3367
"Emotion should reflect reason not guide it"
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