From: Chris Hugo (chrishugo@xxxxxxxxx)
Date: Wed Jul 24 2002 - 13:39:56 GMT-3
Example from Vegesna BOOK
You have three protocols A,B,C.
Your queuing needs are of the following distribution:
A-20%
B-60%
C-20%
Facts on the average packet size of packet:
A-1086 bytes
B-291 bytes
C-831 bytes
To determine byte-count perform the following algorithm
1. FOR Each queue divide the % of bandwidth you want allocated to the queue by
packet size
0.01842 020619 0.02407
2. Normalize the numbers by dividing by the lowest number
1 11.2 1.3
THE Result is the ratio of the number of packets that must be sent.
3. Fraction in any ration values means an additional packet is sent
4 In the example, the number of packets sent is one 1086-byte packet, 12 291-by
te packets and 2 831-byte packets.
He goes into checking the whole thing but I am in a rush .sorrry.
chris hugo
Tom Larus <tlarus@cox.net> wrote: The 12.1 IOS docs on this subject note that
getting the byte-count right is
not as important now as it used to be, because now the custom-queuing system
remembers the deficit when a queue is depleted early or when the last packet
from a queue does not exactly match the configured byte-count, and accounts
for this the next time the queue is serviced.
Does this mean we really don't need to worry so much about the packets sizes
used by different protocols, or that if we don't get it right, our result
will be less wrong than with 12.0, but would still be wrong? It would nice
if we could be accurate using the default byte-counts now.
Does anyone have a guide to the approximate packet sizes of various
protocol's packets? The default is 1500. I read that DLSW needs FST
traffic to be no more than 512 bytes, and I see that a lot of people set lf
to 1500 for TCP DLSW traffic. I would imagine that this is so traffic
originating on a 4472 MTU token ring interface doesn't have to be fragmented
at a 1500 MTU ethernet interface. I seem to remember seeing IPX set to 1024
in a practice lab solution, but I don't know if it is right. Telnet tends
to use tiny packets, but does anyone know what a good reference byte-count
would be?
Thanks,
Tom Larus
----- Original Message -----
From: "Tommy C"
To:
;
Sent: Tuesday, July 23, 2002 9:22 PM
Subject: Re: FW: Custom Queueing bandwidth allocation
> I think you'll also need the average packet sizes for each queue to come
up
> with the byte counts.
>
>
> >From: "Ivan"
> >Reply-To: "Ivan"
> >To:
> >Subject: FW: Custom Queueing bandwidth allocation
> >Date: Wed, 24 Jul 2002 08:52:49 +0800
> >
> >Hi,
> >
> >Had a question on Custom queueing.
> >When a question ask to use custom queueing and allocate different
bandwidth
> >to each queue, I"m not sure how to work out the bandwidth allocation base
> >on the percentage.
> >
> >Example:
> >
> >allocate
> >queue 1 to ip traffic with 50% bandwidth
> >queue 2 to ipx traffic with 20% bandwidth
> >queue 3 to sna traffic with 30% bandwidth
> >
> >
> >With this, how should I specify in the
> >queue-list 1 protocol
byte-count
> >command.
> >
> >Appreciate for any advice.
> >Thanks.
> >Ivan Lim
> >
> >
> >
> >------------------------------------------------------------------------
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