ISP tiered model based architecture for routing scalability

Internet today is faced with problems due to the growing routing table sizes and high churn rates that occur subsequent to changes in routing information. With initiatives for new Internet designs underway, the problem can be addressed through new internetworking models that consider these factors. In this article one such model that is based on the tiered structure of ISPs (used to define their business relationships) is investigated. The model does not use IP and its routing protocols. An analysis of the model applied to the worldwide network of Autonomous Systems (AS) and ISPs shows the significant reduction in routing table sizes and churn rates that can be achieved with the proposed model even under an un-optimized case.