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Re: UUNet 10Plus
From: Peter Kline <pkline () cisco com>
Date: Wed, 09 Jul 1997 21:26:51 -0700

Men,

From my recollection of NetEdge connections from WorldCom Santa Clara to
MFS at Market St. in San Jose, the NetEdges have to be used in pairs, like:


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.  

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).

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.

In the end, in addition to needing more than the 30Mpbs bandwidth to the
MAE which the NetEdges gave us, the NetEdge solution was more trouble than
it was worth because of our inability to monitor the NetEdges for trouble
(not that they couldn't be monitored, but they were MFS owned gear).  We
had to rely on Datanet to tell us what was going on, and many times problem
resolution gave as a cause  FWT (fixed while testing), which customers were
always reluctant to accept as cause.

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

good luck,
-peter


At 07:49 PM 7/9/97 -0400, Alex Rubenstein wrote:
To my knowledge:

                               |-------|
10Plus Cust---|netedge|---DS3---| ATM   |
                               |       |
10Plus Cust---|netedge|---DS3---|Switch |--ATM--|Cisco 4700/7xx0|--(World)
                               |Cascade|
10Plus Cust---|netedge|---DS3---|       |
                               |-------|

I have no idea what the xBR is on the DS3 to the NetEdge.



At 03:17 PM 7/9/97 -0400, Deepak Jain wrote:

My impression [which could be wrong] was that the 10Plus service was 
delivered over clear channel DS3 between netedges and the actual 10Mbit/s 
portion was dealt with at the media exchange. I didn't know/think they 
formatted the DS3 as an ATM 10mbit/s circuit.

Then again, I have never ordered 10Plus service. 

-Deepak.

On Wed, 9 Jul 1997, Joe Shaw wrote:

Well, the ATM connection to the Net Edge box is only setup to do 10Mbps,
so at 6Mbps on ATM, you've filled your cells.  I think the whole ideaology
behind the thing is flawed, and if they're going to sell something they
call 10 Plus, they need to at least provide 10 of something other than
10Mbps in theory.  I'm not happy with UUNet (it took 5 months to get the
Net Edge box replaced), and I doubt they will have anything but the
smallest possible presence in our network in the future.   

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

On Wed, 9 Jul 1997, Deepak Jain wrote:

You could always plug an FDDI card into the back of the Netedge.

-Deepak.




---

"Don't go with a spineless ISP;
      we have more backbone." 

Alex Rubenstein -- alex () nac net -- KC2BUO -- www.nac.net
net @ccess corporation, 201-983-0725 -- 201-983-0725




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