Abstract
Evolution towards the next-generation Internet assumes dynamic end-to-end (E2E) quality of service negotiation on the path between the two providers, which are interconnected by a number of transit providers. Negotiation is performed by means of an appropriate signaling protocol. Basic models for E2E service negotiation include: (1) the cascade model, which assumes that a single provider controls service negotiation on the path, and (2) the third-party (3P) model, in which the trusted intermediary performs service negotiation on behalf of all domains on the path. This article presents a comparative study of the aforementioned negotiation models, regarding transport of signaling traffic. The three realistic topologies of interconnected networks have been simulated, using the network simulator NS2. Particularly, we point out the applicability and deployment of the 3P model.
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