Re: Comparing an old flow snapshot with some packet size data

"Dorian R. Kim" <> Sat, 10 August 1996 05:49 UTC

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Date: Sat, 10 Aug 1996 01:28:28 -0400 (EDT)
From: "Dorian R. Kim" <>
Reply-To: "Dorian R. Kim" <>
To: Andrew Partan <>
Cc: Brian Carpenter CERN-CN <>,
Subject: Re: Comparing an old flow snapshot with some packet size data
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On Sat, 10 Aug 1996, Andrew Partan wrote:

> The question is, if you were designing a backbone today, what would
> you use for your hub LANs?  Fddi?  Or 100baseT?  100baseT is probably
> going to be a lot cheaper (it looks like there is going to be a
> *lot* of it made), but its MTU is 1500.

Neither, I would think. Neither FDDI nor 100baseT is fast enough to be useful
in interconnecting backbone routers.

If it's a question of interconnecting customer aggregation boxes to backbone
routers, I'd rather go with FDDI rather than 100baseT as FDDI degrades more
gracefully under load. Given that full duplex FDDI is now a possibility, the
only disadvantage of FDDI is cost. (well... there is more overhead to, but..)

> Can you get by with this?  Or do you really need to invest in LANs
> that do 4470?

I think that today is a particularly bad time to think about this issue in
operational terms as point to point connection speeds have made all
exisiting and widely deployed multi-access technologies inadequate, and next
generation technologies that promises order of magnitude improvements are not
here yet.

Any solution arrived at, FDDI, switched FDDI, switched full duplex FDDI,
100baseT, switched 100baseT and ATM are all stop gap measures at best.

> Any high performance internet folks out there?  What would you do
> (or want us to do)?

I would think that the problem of just simply going faster and the problem of
making massively aggregated flows flow through bigger pipes are not quite the
same thing.

Not that this is much of an answer. :)