From: John Matijevic (matijevi@bellsouth.net)
Date: Sun Jun 29 2003 - 10:35:34 GMT-3
Hello Emad,
I just sent a good QOS problem this week on CQ. Unfortuanately, I have
learned there is not much good documentation on QOS so your going to have to
come up and play around with it (trial and error), in order to fully
understand it. Now for the answers to your quesions:
1)> 1- from where he calculated this byte-count although he didn't define
> the bandwidth on the interface except the the percentage already
> stated ? may be I'm misunderstand something,
Answer: The auther is using a reference of 10000 bytes, you can use whatever
value they want if the directions dont specify. Next you take the percentage
and multiply the reference bytes so 10000*.50 = 5000, do the same for the
rest of the percentages. Note here if you come up with 1500 bytes you do not
need to specify the que because that is the size of the default queue.
2- what is the benefit behind the command lowest-custom
Answer: Ok I think I you have to tie this answer with your third question,
you specify th command lowest-custom, because since the question is asking
you to put telnet into a preemptive que, this will not be included in your
queue-list 1 queue byte count, so you have to reference the starting point
of the lowest queue, number, which is the FTP:
> Queue-list 1 queue 2 byte-count 5000
> Queue-list 1 queue 3 byte-count 1000
> Queue-list 1 queue 4 byte-count 4000
see here the queue-list 1 queue 2---- this is the lowest number to you
specify this in the command lowest-custom
> 3- what does he mean from the keword pre-emptive queue
answer: when you want to put the que in a pre-emptive queue, this means that
this que will not be part of the queue-list byte count configuration.
Hoepfully this information helps.
Sincerely,
Matijevic
----- Original Message -----
From: "Emad " <emad@zakq8.com>
To: <ccielab@groupstudy.com>
Sent: Sunday, June 29, 2003 2:06 AM
Subject: QoS: Custom-queuing
> Folks,
> I found this example about QoS in Cisco course manual but I didn't get
> some points , let's start watching:
>
> Enable CQ between two routers R1 and R2 according to the following
> policy:
> - classify telnet traffic into a pre-emptive queue (what soes it
> means?!!!??)
>
> - classify ICMP traffic so that it gets at least 10% of the BW
>
> - classify FTP traffic so that it gets at least 50% of the BW
>
> - classify the rest of the traffic so that it gets the rest of the BW.
>
> The solution
>
> Access-list 101,,,defines Telnet
> Access-list 102 ,,defines FTP
> Access-list 103 permit icmp any any
>
> Queue-list 1 protocol ip 1 list 101
> Queue-list 1 protocol ip 2 list 102
> Queue-list 1 protocol ip 3 list 103
> Queue-list 1 default 4
>
> Queue-list 1 queue 2 byte-count 5000
> Queue-list 1 queue 3 byte-count 1000
> Queue-list 1 queue 4 byte-count 4000
> Queue-list 1 lowest-custom 2
>
> Interface serial 0
> Custome-queue-list 1
>
>
> The questions
>
> 1- from where he calculated this byte-count although he didn't define
> the bandwidth on the interface except the the percentage already
> stated ? may be I'm misunderstand something
>
> 2- what is the benefit behind the command lowest-custom
>
> 3- what does he mean from the keword pre-emptive queue
>
> thanxxx
>
>
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