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Avi Freedman freedman at
Fri Jul 19 21:17:19 UTC 1996

> If you have full use of the fiber across which you move your packets you
> can create a mesh of PVCs directly connecting each router thus decreasing
> the hop count. The same can be done when using an existing cell-relay cloud,
> but you pay on a per pvc basis so the benefit needs to be weighed against the
> cost. Of course the packets still flow along the same physical path and in a 
> wide area network the time in transit will be more significant than the time 
> to get through the routers.
> Jim

Nope, remember - there is no magic.  Any mesh of PVCs that one makes
over a switched network must reflect the toplogy of that network, and
one can set up a matching set of active routing sessions and route
weights which will cause traffic to flow the same way.

Yes, the switches are a bit faster and have less to do. Data moves through 
them in a few ms less per point.  But as you said (and as I said in our
discussion in NYC), relative to any distance, the speed of light guarantees 
that you won't notice the difference.

The question is:  Will there be routers available that can make IP
routing decisions based on 40-60kroutes and move 2-3 OC3s worth of 
bidirectional traffic?  The building of the configs to have a routed
network work the same as a switched ATM one can be automated, but it's
true that it *can be* easier to see what's going on in a large-scale 
switched network.


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