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RE: Fwd: "The Lab, The Bad & The Ugly" [7:75519] posted 09/16/2003
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OK,

It is still sinking in slowly into my "thick" brain ;-> I guess I
couldn't comprehend it because it involved Maths - my weakest subject !!

I will continue to fight this. I just can't seem to get some things down
at all!! But then BGP comes 2nd nature to me, Why??

Question: So I have to watch out in the question for  byte size and byte
count, then correct?

Work my way backwards from the byte count and leave the link bandwidth
alone?

Then where does the limit option come in, then?

Thank you.

Sincerely,

>From: "Priscilla Oppenheimer" >Reply-To: "Priscilla Oppenheimer" >To:
cisco@xxxxxxxxxxxxxx >Subject: RE: Fwd: "The Lab, The Bad & The Ugly"
[7:75519] >Date: Tue, 16 Sep 2003 05:27:21 GMT > >Cisco Nuts wrote: > > >
> >From: "Cisco Nuts" >To: cisconuts@xxxxxxxxxxx >Subject: "The > > Lab,
The > > Bad & The Ugly" >Date: Tue, 16 Sep 2003 02:41:01 +0000 > > >
Received: from 68.100.105.229 by lw15fd.law15.hotmail.msn.com > > with
HTTP; > > Tue, 16 Sep 2003 02:41:01 GMT > > X-Originating-IP:
[68.100.105.229] > > X-Originating-Email: [cisconuts@xxxxxxxxxxx] > >
From: "Cisco Nuts" > > To: cisconuts@xxxxxxxxxxx > > Subject: "The Lab,
The Bad & The Ugly" > > Date: Tue, 16 Sep 2003 02:41:01 +0000 > >
Mime-Version: 1.0 > > Content-Type: text/plain; charset="us-ascii" > >
X-Converted-To-Plain-Text: from text/html by GroupStudy > > > > Hello
Group, Have a question on this Lab from CCIE PSV I. > > Requirement: > >
Configure custom-queueing on R4 with the following guidelines: > > Eigrp,
> > Ospf and IPX traffic have a byte size of 500 and 25% of the > > link.
WWW > > traffic has a byte count of 1412 and will get 10% of the link. >
> The byte > > size for the default queue is 700 and will get 65% of the
link. > > Solution > > Proposed: on R4#queue-list 1 protocol ip 1 list
101 > > queue-list 1 protocol ipx 1 > > queue-list 1 protocol ip 2 list
102 > > queue-list 1 default 3 > > queue-list 1 queue 1 byte-count 3000 >
> queue-list 1 queue 2 byte-count 1412 > > queue-list 1 queue 3
byte-count 9800!access-list 101 permit > > eigrp any any > > access-list
101 permit ospf any any > > access-list 102 permit tcp any eq www any > >
access-list 102 permit tcp any any eq www!I am not really sure > > how
the > > byte-count got converted to 3000? I was under the impression > >
that the > > byte-count stayed at 500 as per the requirement and that the
> > limit would > > be 25% of the link which should be
[(25/100)*1544000}= 338 > >Where did 1544000 come from? The bandwidth of
a T1 in bits per second? >You're dealing with ratios of bandwidth used,
not bits per second. If you do >the calculation right, it will work for
any bandwidth. > >For every time that you send a 1412-byte WWW packet,
how many IPX, etc. >packets should you send to ensure that IPX, etc. uses
2.5 the bandwidth that >WWW uses? (I say 2.5 because 25% is 2.5 of 10%.)
> >1412 x 2.5 = 3530 bytes. That would be 7 500-byte packets, plus one
more >because if there are bytes left over, the Q will grab the next
packet. So >it's really 8 500 byte packets or 4000 bytes. (I don't know
where they got >3000 bytes.) > >For every time that you send a 1412-byte
WWW packet, how many bytes for >other (default) protocols should you send
to ensure that the default uses >6.5 the bandwidth that WWW uses? (I say
6.5 because 65% is 6.5 of 10%) > >1412 x 6.5 = 9178 bytes. But remember
they come in 700-byte chunks. Does 700 >go into 9178? Not exactly. Round
up to 700*14 = 9800. > >Do you remember word problems like "if you have
six nickels and seven dimes, >how many quarters must you have to reach
x?" That's what this is like. The >packets come in differnet sizes like
nickels, dimes and quarters. Sorry it's >late. :-) > >Priscilla > > > > >
(roughly). And > > similiarly for the other 2 requirements.Is this not
true? What > > would be a > > preferable solution expected in the real
Lab?Thank you for your > > advise.Sincerely,CN > > > > > > > > >Message
Posted at: >http://www.groupstudy.com/form/read.php?f=7&i=75525&t=75519
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