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Re: UUNet 10Plus
From: Joe Shaw <jshaw () insync net>
Date: Thu, 10 Jul 1997 11:46:36 -0500 (CDT)


On Wed, 9 Jul 1997, Peter Kline wrote:

Men,

CPE -- 10baseT/FDDI ---|netedge|--- DS3 ---|netedge|--- 10baseT/FDDI -- switch

In otherwords, the NetEdges act as bridges, which have to be used in a pair
in order to turn the ethernet or FDDI connection into ATM over the DS3 and
back.  The NetEdges are programmable, and I'm sure that bandwidth is one of
the things that's configurable.  

That's the connection we have alright, but MFS/UUNet says they cannot
limit the amount of bandwidth on it, and that if they gave us a 100Mbps
handoff off the NetEdge box, then we'd get 100Mbps off it and there was
nothing they could do.  My response was why not provision the ATM bridge
to 10-13Mbps, and use that to limit the data throughput?  Seems that would
work, but they said no go.  Frustrating.


We used to run these things fairly full and fairly hard for extensive
periods of time.  I think we were able to get about 30Mpbs full duplex out
of them.  I doubt that dropping packets at ~6Mpbs is the NetEdges' fault
(unless you had really old ones).

Yes, it was an old one, and after months of complaining they finally
delivered a new one yesterday morning.  It is working MUCH better, but as
soon as the link approaches 6Mbps or more, it starts choking hard.

The fundamental problem at the upper bound is that you're taking IP,
encapsulating it in ethernet or FDDI, then segmenting and further
encapsulating that (IP inside ethernet/FDDI) inside ATM.  The double
encapsulation extracts even more of a tax than the !53 bunch usually
complain about.

If you're interested in a second opinion, you might try contacting NetEdge
directly.

Indeed.  That's what I plan on doing today...  Thanks for the input.

good luck,
-peter


Joe Shaw - jshaw () insync net
NetAdmin - Insync Internet Services
"Learn more, and you will never starve." - Paraphrase of Lee




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