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Multiple SDN applications can make several harmful interferences unintentionally, although each individual application may be properly developed. This paper proposes a Multiple SDN Applications Interference Detector (MSAID). To bridge the gap between the source code of applications and the actual interferences, we leverage symbolic execution and constraint solving to obtain how the event handler handles...
While extending network programmability to a larger degree, P4 also raises the risks of incurring runtime bugs after the deployment of P4 programs. These runtime bugs, if not handled promptly and properly, can ruin the functionality and performance of networks. Unfortunately, the absence of runtime debuggers makes troubleshooting of P4 program bugs challenging and intricate for operators. This paper...
Traffic Engineering is an efficient tool to balance the network flows and, thus improving the network performance with limited network resources. The goal of traffic engineering is to find an efficient and robust routing to balance the flows with changing traffic. Multiple traffic matrices are good representatives of the changing traffic. The emergence of Software Defined Networking (SDN) provides...
As inter-domain routing on today's Internet does not and basically cannot consider traffic load when determining best traffic forwarding paths, it is not always optimal for a router to forward packets along its default path, especially when the router's default output port incurs a long queuing delay. In this paper, we design a new approach called TED in which border routers of autonomous systems...
Enterprise networks have become increasingly important with the rising number of users accessing their services, which consequently brings challenges in various aspects. Though Open Flow, the promising scheme for enterprise network control, can provide fine-grained and flow-level control in networks, yet it still has a few undesirable designs in security, scalability and performance. Inspired by many...
The traditional IP routing protocols transfer traffic only according to destination, which is not fine-grained enough to satisfy the significant demands of quality-of-service (QoS) and traffic engineering, so fine-grained flow control techniques, such as Multiprotocol Label Switching (MPLS) [1], emerge. MPLS is the most widely used technique to do fine-grained flow control.
Multiple MIMO (Multiple Input Multiple Output) modes are the salient characteristics of 802.11n wireless networks. An efficient MIMO mode switching scheme is highly desirable for rate adaptation, which can optimize combination of MIMO mode and MCS (Modulation Coding Scheme) to achieve the maximum system throughput. In this paper, we have proposed and verified three design guidelines for the MIMO mode...
In current network, as we all know, packets delivered by routers only rely on destination-address-directed forwarding, but their source addresses are not checked. Consequently, this incurs many serious network security breach events which are hard to trackback. Under this situation, a switch (we call it SAVI switch) followed SAVI (Source Address Validation Improvement) framework proposed by IETF was...
The goal of data-center networking is to interconnect a large number of server machines with low equipment cost while providing high network capacity and high bisection width. It is well understood that the current practice where servers are connected by a tree hierarchy of network switches cannot meet these requirements. In this paper, we explore a new server-interconnection structure. We observe...
As scalable routers being a promising way to scale to higher capacity, scalable switch fabric as its key component has received a great deal of attention. However, the reliability calculation method for general switch fabric does not suit scalable switch fabrics with special features. In this paper, we study the features of scalable switch fabrics, and propose a novel reliability measure called Failure...
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