Re: Exchanges that matter...

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

Bingo.