As IP networks become the life-line of business and commercial applications, the need for better service guarantees and improved performance are driving the deployment of service differentiation and traffic engineering in IP networks. Both typically involve data path mechanisms like packet classification etc. and control path mechanisms like signaling and extensions to routing protocols. This paper focuses on routing, in particular, on evaluating the trade-off that exists between the added complexity and cost of the extensions required to accommodate traffic engineering, and the performance benefits it affords.
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