Inter-exchange media types

But there are customers for whom end-to-end MTU is a buying issue.
Bogus or not, it is a very real issue.

They exist, but are there enough of them to make it work the extra
money to accomodate them? Nobody seems able to say how real the issue
is (ie, hard usage and performance numbers).

While larger MTUs are a good thing, they aren't very common and as
100BT gets more popular, I expect them to become even less common. I
guess the router/switch manufacturers will just have to be prepared
to handle high packet rates.

Or maybe we need a "reverse fragmentation" protocol. Packets to the
same destination could be lumped together and routed/switched as a
single packet.