From: Scott Savage (rolande23@sbcglobal.net)
Date: Sat Jul 17 2004 - 18:17:58 GMT-3
I have searched and looked through a number of
documents covering frame-relay fragmentation and have
not been able to find a good answer to this question.
What is the correct way of calculating the # of bytes
for fragmentation? In all the examples I have seen,
it appears that the value is set to Bc when it is
small and relates to voice and the value tends to be a
fairly small number like less than half of the
interface MTU or else 1/8th of Bc if Bc is larger than
the interface MTU. I have found no rhyme or reason to
this, though. Is it user preference as long as the
number isn't smaller than the framesize of the
"realtime" traffic you're trying to reduce latency for
or larger than Bc?
I am assuming in the real world you are really only
going to use fragmentation when you are running
something like voice/video across a link smaller than
768K. But if a question comes along dealing with
fragmentation and the Bc value is greater than 1500,
then what is the right way to determine the
fragmentation byte count or what are the right
details/requirements to pay attention to that would
help you arrive at an acceptable number?
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-- Scott Savage
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