From: loizos yiangou (david_steven2001@yahoo.com)
Date: Thu Oct 17 2002 - 04:46:49 GMT-3
Step 1 For each queue, divide the percentage of
bandwidth you want to allocate to the queue by the
packet size, in bytes. For example, assume the packet
size for protocol A is 1086 bytes, protocol B is 291
bytes, and protocol C is 831 bytes. We want to
allocate 20 percent for A, 60 percent for B, and 20
percent for C. The ratios would be:
20/1086, 60/291, 20/831 or
0.01842, 0.20619, 0.02407
Step 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 so that the percentage of bandwidth that
each protocol uses is approximately 20, 60, and 20
percent.
Step 3 A fraction in any of the ratio values means
that an additional packet will be sent. Round up the
numbers to the next whole number to obtain the actual
packet count.
In this example, the actual ratio will be 1 packet, 12
packets, and 2 packets.
Step 4 Convert the packet number ratio into byte
counts by multiplying each packet count by the
corresponding packet size.
In this example, the number of packets sent is one
1086-byte packet, twelve 291-byte packets, and two
831-byte packets, or 1086, 3492, and 1662 bytes,
respectively, from each queue. These are the byte
counts you would specify in your CQ configuration.
--- "MOLINA, MARTIN J (PBI)" <mm1343@sbc.com> wrote:
> Howdy,
> I'm working out of a certain vendors' workbook and
> they never specify the
> average packet sizes for Custom Queuing. Does anyone
> have a good formula for
> deriving the custom queue byte count when the
> average packet sizes are not
> given?
>
> Example:
> IP traffic will use 40%
> TELNET will use 10%
>
> Martin Molina
> Senior Network Engineer
> CCNP CCDP
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