The IP Over NBMA (ION) Archive

[Masataka Ohta <mohta@necom830.hpcl.titech.ac.jp>]

Bert;

> > > > > Minimizing topological mismatch could reduce the need not just for
> > > > > unicast cut-through, but for multicast cut-through as well.
> > 
> > Your point, here, shoud be not to fully align the topology
> > but to minimize mismatch to make multicast cut-through
> > unnecessary.
> > 
> > But, it makes unicast cut-through unnecessary.
> 
> Minimizing (abolishing) topological mismatch makes cut-through easy.

Easy? Wrong. It's proven to be impossible.

Because multicast cut-through does not scale and is impossible, it
must be unnecessary.

> The real problem here, in my view, is the term "cut through." It implies 
> something physical. Instead, it can just be "cutting through" the lines 
> someone drew on a piece of paper.

Whatever terminology you might use, as long as IP routers are skipped,
the result is the same.

							Masataka Ohta