TAILIEUCHUNG - Constraint-Based Routing in the Internet: Basic Principles and Recent Research

With the proliferation of Web and multimedia services, and virtual private networks (VPNs) connecting corporate sites, more versatile Internet routing protocols have become critical. Current Internet packet forwarding is based on the destination address. Simple routing algorithms that determine forwarding paths based on the minimum number of hops or delay to a specified destination are no longer sufficient. The need to support diverse traffic types and applications with quality demands (see Figure 1) imposes new requirements on routing in the (now commercial) Internet. New routing paradigms are also required to handle service agreements among service providers and users. Administrative policies, performance requirements, load balancing, and scalability are thus becoming increasingly significant factors in Internet. | 1 Constraint-Based Routing in the Internet Basic Principles and Recent Research Ossama Younis and Sonia Fahmy Department of Computer Sciences Purdue University 250 N. University Street West Lafayette IN 47907-2066 USA Phone 1-765-494-6183 Fax 1-765-494-0739 E-mail oyounis fahmy @ Abstract Novel routing paradigms based on policies quality of service QoS requirements and packet content have been proposed for the Internet over the last decade. Constraint-based routing algorithms select a routing path satisfying constraints which are either administrative-oriented policy routing or service-oriented QoS routing . The routes in addition to satisfying constraints are selected to reduce costs balance network load or increase security. In this paper we discuss several constraint-based routing approaches and explain their requirements complexity and recent research proposals. In addition we illustrate how these approaches can be integrated with Internet label switching and QoS architectures. We also discuss examples of application-level routing techniques used in today s Internet. Keywords constraint-based routing QoS routing policy routing MPLS DiffServ content routing I. Introduction With the proliferation of Web and multimedia services and virtual private networks VPNs connecting corporate sites more versatile Internet routing protocols have become critical. Current Internet packet forwarding is based on the destination address. Simple routing algorithms that determine forwarding paths based on the minimum number of hops or delay to a specified destination are no longer sufficient. The need to support diverse traffic types and applications with quality demands see Figure 1 imposes new requirements on routing in the now commercial Internet. New routing paradigms are also required to handle service agreements among service providers and users. Administrative policies performance requirements load balancing and scalability are thus becoming increasingly .

• Quản trị mạng
• patient centred approach
• specific perceptual
• practical problems
• Distribution
• Basket Content
• parameter estimates
• Sustainable Food System
• Targeting Production
• Methods
• Báo cáo sinh học hay
• cách trình bày báo cáo
• báo cáo sinh học
• công trình nghiên cứu sinh học
• tài liệu về sinh học
• Organic and Conventional
• Behavioural Perspective
• Practice Theory
• Occupational cancer