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>> really? 53 to 64 makes that much difference?
I want to ask a question though - do routers really re-assmble IP packets to chop and send over a fabric?? It would seem very inefficient to receive 53 byte cells, convert to IP frames - somewhere between 40 bytes and 1526 bytes (MPLS with standard LLC Snap packets) just to chop again into 64 bytes to rassemble and ship.
>> I hope you are not talking about IP
fragmentation and re-assembly here. Assuming
that yes it is inefficient. Maybe that is why
in general routers don't have ATM ports.
If so - it is very clear why routers don't manage ATM switching well.