Exchanges that matter...

rosas at NetEdge.COM rosas at NetEdge.COM
Mon Dec 9 21:57:10 UTC 1996



NetEdge would be very interested in learning more about your performance 
observations.   Can we get more data?  If you'd like we could go offline and 
offer some analysis and suggestions/solutions.  

Also, to answer your question, the performance is doubled from FDDI to ATM in 
the newer Edge platform just released.  In fact, existing ATM Connect FDDI cards
with a possible upgrade (if needed, depending on revision) can be inserted into 
the new Edge platform to yield this extra performance. 

Let me know how we can help.

Rocky Rosas
Director - Technical Support
NetEdge Systems
Support: 800 NET-ATM1
rosas at

______________________________ Reply Separator _________________________________
Subject: Re: Exchanges that matter...
Author:  Matthew Petach <mpetach at> at internet_mail
Date:    12/9/96 4:08 PM

> On Sun, 8 Dec 1996, Nathan Stratton wrote: 
> |} > Every NAP with a GIGAswitch/FDDI offers full duplex FDDI; the MAEs,
> |} > Sprint, PAIX, and you. Buy a full-duplex-capable card, install it, and 
> |} > you get full duplex. You, the NAP operator, do nothing; the devices
> |} > negotiate in and out of full duplex mode themselves. 
> |} 
> |} Ah, if I have a FDDI connection into MAE-East I cant do full duplex 
> |} unless they enable it, it now is disabled. 
> Perhaps you should talk to them again.  Steve Feldman (MFS) has said
> multiple times that FFDT is enabled on the MFS Gigaswitches.  At the last 
> NANOG, he suggested people try out the 'new' feature implemented by Cisco 
> and send him feedback.  As Stephen Stuart (PAIX) pointed out you have to 
> disable the feature as it's enabled by default.
*cough* *cough*  Hate to jump into the middle of this wonderful 
debate, but has anyone here been able to push more than 60-70mbs 
through the fddi interfaces in the NetEdges anyhow?  We've upgraded 
to an oc3c line to MAE-West, and discoverd that lo and behold,  you 
don't get that much more out of the link than you did with a DS3 
because the fddi cards top off not much farther up.  Full duplex
is a nice thought, and would win us another 5-10mbs, but since
we are far and away a content provider (traffic ratio outbound to 
inbound is close to 10:1 at MAE-West), what we're concerned about
is being able to deliver the content people are asking for.  Opening 
up the back channel from shared to full FDDI is a, well, "nice" 
feature, but isn't nearly as attractive as getting better FDDI
cards for the NetEdges.
On the flip side, we've had the same NE's on our prem from 
MFS for about 2 years now; does MFS have any plan to cycle
them out for the newer, faster models that are being released? 
Is it likely that we would see performance improvements by 
having a newer box/card combo at both ends of our link?
Just some ideas to toss out before the crowd...
Thanks for any feedback!
> -jh-
Matt Petach
Network Engineer, InterNex (working from home)

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