From: MADMAN (dave@xxxxxxxxxxxxxx)
Date: Thu Jun 20 2002 - 16:58:32 GMT-3
Anthony Pace wrote:
>
> But if each map-class has a CIR and MINCIR, don't I want each one to
> have only a peice of the pie? If I read you correctly you would want
> all 8 map-classes to have a CIR of 1544 so that they "may" use all the
> bandwidth if there were no congestion and a MINCIR of say 128 so that
> if every spoke had traffic we would diveid it up. Is that correct?
In a nutshell, yes. Otherwise your basically screwing yourself out of
potential bandwidth. If you happen to be going in and out of the same
frame switch, no NNI, you can often get well above your CIR for a
sustained time.
> Also does the command wjere traffic shaping parms are all on one line
> express the Bc abd Be different than if you put thme seperatly in a
> map-class?
Not sure what you mean.
Dave
>
> Anthony Pace
>
> On Thu, 20 Jun 2002 13:45:53 -0500, "MADMAN" <dave@interprise.com>
> said:
> >
> >
> > 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"
> >
>
> --
> Anthony Pace
> anthonypace@fastmail.fm
>
> --
> http://fastmail.fm
> - Ever wonder why we aren't named snailmail.sm?
-- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. dave@interprise.com 612-664-3367"Emotion should reflect reason not guide it"
This archive was generated by hypermail 2.1.4 : Tue Jul 02 2002 - 08:12:39 GMT-3