From: Nick Nikolov (nnikolov@xxxxxxxxxxx)
Date: Thu Jun 20 2002 - 20:27:26 GMT-3
There was very good post last month, how to calculate the bytes for CQ.
Using largest protocol byte (or be more precise lowest % / byte ), all
calculations are shrunk in a very simple formula.
Let's say we have protocol A,B and C.
Protocol A
Ab - byte size
A% - band.
Protocol B Bb, B%
Protocol C Cb, C%
using exact calculation:
A% / Ab
B% / Bb
C% / Cb
Assuming C%/Cb is the lowest (usually when Cb is the biggest packet size)
(A% / Ab ) / (C% / Cb) * Ab = (A% / C%) *Cb
(B% / Bb ) / (C% / Cb) * Bb = (B% / C%) *Cb
If we are using only 1500 as a byte count, C% would be the lowest protocol
bandwidth
In our case protocol with 512b using 50% and 1500b using 25% we have:
50 / 25 * 1500 = 3000
25 / 25 * 1500 = 1500
-Nick
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Anthony Pace
Sent: Thursday, June 20, 2002 4:41 PM
To: David Luu; Shane Miles; 'ccielab@groupstudy.com'
Subject: RE: CQ
SO if one protocol has 512bytes and needs 50% and another app has 1500
bytes and needs 25% then go with 3000 and 6000 instead of 3072 and 6144
for the queues?
Anthony Pace
On Thu, 20 Jun 2002 13:39:52 -0700, "David Luu"
<wicked01@ix.netcom.com> said:
> you want to calculate based on the largest data unit
>
> At 07:21 PM 6/20/2002 +0000, Anthony Pace wrote:
> >ok. then it as simple as making the smallest Data Unit the basis for
> >calculating the Queue size and using percentages to determine how many
> >multiples of this to sue in createing queue sizes.
> >
> >
> >
> >On Thu, 20 Jun 2002 14:49:47 -0400, "Shane Miles" <smiles@ftdata.com>
> >said:
> > > In later IOS versions, can't remember exactly which version it
started,
> > > IOS
> > > keeps track of when a packet is larger than what is left in the queue
> > > so the
> > > next time through the queue it is subtracted so large packet traffic
is
> > > no
> > > longer such a big consideration.
> > >
> > > -----Original Message-----
> > > From: Anthony Pace
> > > To: Shane Miles; 'ccielab@groupstudy.com'
> > > Sent: 6/20/02 12:58 PM
> > > Subject: Re: CQ
> > >
> > > I usually round things off in these labs and I see some of the authors
> > > do the same. Does anyone think it is important to take into
> > > consideration the fact that the queing won't fragment a packet meaning
> > > a queue of 1000 bytes and a Data Unit of 900 would really get 1800
> > > bytes on each "round"? Does the CCIE test expect you to research the
> > > MTU's on interfaces and/or apps and protocoles or just use the paacket
> > > sizes and percentages they supply in the question?
> > >
> > > Anthony PAce
> > >
> > >
> > >
> > > On Thu, 20 Jun 2002 11:29:45 -0400, "Shane Miles" <smiles@ftdata.com>
> > > said:
> > > > If I don't have a byte-count I always use 1500 for lab purposes.
So,
> > > > it
> > > > would be:
> > > >
> > > > Telnet--3900 bytes
> > > > FTP--1500 bytes
> > > > IPX--3240 bytes
> > > > DLSW--3240 btyes
> > > > Other--3900 btyes
> > > >
> > > > At least I think that's right. Please point out the errors anyone.
> > > >
> > > > -----Original Message-----
> > > > From: CHIDI FRANCIS
> > > > To: ccielab@groupstudy.com
> > > > Sent: 6/20/02 10:14 AM
> > > >
> > > > Hi Members,
> > > > Iam still having a hard time with CQ. Suppose the question says to
> > > > configure
> > > > Queuing as follows
> > > > Telnet--25%
> > > > FTP----10%
> > > > IPX----20
> > > > DLWS---20
> > > > Other--25%
> > > > My question is how do I solve this if I was not given the byte-count
> > > > for
> > > > each
> > > > protocol
> > > >
> > > > Ant help guys
> > > >
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