Exchanges that matter...

Jeremy Porter jerry at
Mon Dec 9 03:15:57 UTC 1996

In message <CMM-RU.1.0.850069139.rob at>, Rob Liebschutz writes:
>> On Sun, 8 Dec 1996, Joe Rhett wrote:
>> >  
>> > > It is actually quite hard in practice to push a FDDI switch
>> > > into trouble, although theoretically it should be simple, modulo
>> > > the interesting effects that token-withholding can produce.
>> >  
>> > Hm. Not sure what you mean. FDDI can certainly be over-utilized, that's
>> > not hard. On the other hard, FDDI doesn't fall down and die like
>> > Ethernet does when congested.
>> > 
>> > > In practice, the limiting factor will tend to be the per-port
>> > > bandwidth rather than the aggregate bandwidth.  One would have
>> At the Atlanta-NAP we offer full duplex FDDI, why not try to get MFS to do
>> it? Cisco now has a full duplex FDDI card, so you can do 200 Mbs into the
>> NAP.
>Talk to Steve Feldman from MFS.  At the October Nanog meeting he
>mentioned that their Gigaswitches (not sure if this is was just for
>MAE West) were ready to support Full Duplex FDDI and he invited
>volunteers to try it.
>Unfortunately, the GRF does not yet have a full duplex FDDI interface
>available, but when I asked about it, Ascend told me that they had
>implemented a CDDI interface in 3 weeks time to gain the business of
>of one customer.

Of course the rumor has it that CDDI was invented in about
that same length of time, so it can't be too hard to duplicate
that effort.

Jeremy Porter, Freeside Communications, Inc.      jerry at
PO BOX 80315 Austin, Tx 78708  |  1-800-968-8750  |  512-458-9810

More information about the NANOG mailing list