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I think there is a perception that the evolution of networking ultimately involves one architectural paradigm to solve all problems. I think that's why people have difficulties with "flow based QOS with resource reservations" because they map every applications & services they know to this architecture. Sorry, our world doesn't count on "silver bullets". Like Mark Seery pointed out keenly, there is room from different solutions to different problems."
One of the reasons why this "One ring to rule them all, one ring to bind them" attitude exists is greed (just as in the book - lol.)
But the economics of the situation are, for your average telco executive, often compelling.
How many telco executives do YOU know that have much in the way of clues about the fundamental constraints of their own infrastructure?
Let me guess: is it a nice ROUND figure?
OTOH, How many of them have fallen for the
"single network architecture" line?
Vendors also play their part in this lunacy. They often do as Caspian appears to have done; selling a vision that is neither realisable nor, in the end, desirable, but looks attractive on (an accountants) paper.
Many telcos are spending immense sums to "unify" their infrastructure with an "IP only" technology silver bullet, seeking for once and for all to slay the werewolf of a complex multiplexed world that requires multiple complex solutions to multiple complex problems.
I believe that you and I know that when they've achieved this they will find that there are good reasons why not everyone drives the same model of car to work. Why truck drivers drive trucks. Why pilots drive aircraft, and why sailors drive boats.
Just don't invest any of your hard-earned, tax-paid dollars in any telco that has announced such a strategy (or perhaps that is actually taking it seriously and not just making marketing noises).
Share & Enjoy.