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Any engineering person who says this should be fired. Obviously he has no financial responsibility or visibility to the operational costs of a network. Maybe with this mindset we should trash all this stat-mux stuff and go back to TDM ?
You are simply wrong. There are ways to make GUARANTEED IP services into a network using IP/MPLS, CAC, policing and shaping. The problem with thinking it can't be done is that too many people relate their experience to legacy boxes that can't make guarantees or provide QOS and than come to a conclusion.
If a router polices, shapes and colors appropriately for a given SLA, enforces reservations made through RSVP to RESERVE a GIVEN bandwidth on a LSP, has appropriate admission controls for that reservation and WORKS and doesn't exceed the RESV (except for BE), it can be done and done easily with little work on behalf of the operator. There are enough TE drafts that couple with the RIGHT HW can make this possible.
I hope everyone sees life after Cisco/JNPR and doesn't take their capabilities as physics! They will SOMEDAY deliver on this and perhaps assist to change your minds and WHEN that day changes, perhaps change the STUBBORN minds of more of you.
The next time you decide to overprovision a network to give you music/movie nad porno seeking PTP friends a break, put on an financial hat and figure out alternatives. Congestion can be a good thing IF you have the right toolkit.