North American Network Operators Group|
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Re: Building exchanges that matter ..
> Very fast ethernets are designed with two modes, standard > a standard CSMA/CD bus and a full-duplex collision-free mode. [ .. your lesson on basic networking deleted .. ] > ATM since one is stuck playing with forwarding based on > only one address space. Yah, I'm familiar with all this. I'm sitting behind one of those "Bad Notworks" boxes right now, actually. > I'm not sure what flexibility you're referring to wrt ATM > vs very fast ethernets, however the latter in combination > with software in one particular modern router that isn't > completely rocket-science can spoof rate-limited VCs > based on MAC addresses, which more-or-less duplicates > the one feature of ATM that I happen to like. Uh.. I'm not sure what you're asking, because I suspect the answer I'm about to give you'd have already considered, no? Ethernet -> Flat. Creating true architectural redundancy isn't possible without separate routes for each connection. Also, even full duplex Ethernet never achieves full bandwidth utilization due to the protocol implementation (hardware protocol). Advantage: All vendors support it, and is usually works without help. ATM -> Flat/Star/Web/whatever. You can create both bandwidth and redundancy without routing. Disadvantage: Every vendor supports it differently, and most of them only have 2 people that really know it. Never works without help. Also, congestion control between hetrogenous systems is a no-op. - - - - - - - - - - - - - - - - -