1,721,050 research outputs found
A DAG-Based Forwarding Paradigm for Large Scale Software Defined Networks
No full textThe Software Defined Network (SDN) paradigm represents a major breakthrough in the networking field, due to its unprecedented capabilities in terms of flexibility and programmability. SDNs have been successfully deployed in data centers and small to medium enterprises. However, adopting the SDN paradigm in the context of wide area networks is more challenging, due to a number of factors including the higher probability that node and link failures occur and the unavailability of a dedicated control channel. In this paper, we present a DAG (Directed Acyclic Graph) based forwarding paradigm addressing the challenges that arise when the SDN concept is applied to large scale networks. Specifically, the proposed paradigm aims to limit the number of entries required on the SDN switches, to provide a fast local restoration of single node/link failures without the intervention of the SDN controller and to prevent the possibility of having inconsistent forwarding tables during updates. The proposed paradigm does not require any extension to the OpenFlow protocol and we show how it can be implemented by only using standard features. The DAG-based forwarding paradigm requires to compute a DAG between every pair of ingress-egress switches and to design an index-based hashing scheme to balance the load across the paths in the DAG while avoiding TCP reordering issues. In this paper, we present heuristic algorithms providing a solution to such problems and report the results of a simulation study conducted to assess the performance of the proposed forwarding paradigm
Distributed Internet Traffic Generator (D-ITG): analysis and experimentation over heterogeneous networks
No full textPoster Proceeding
Does salt intake in the first two years of life affect the development of cardiovascular disorders in adulthood?
No full textDoes salt intake in the first two years of life affect the development of cardiovascular disorders in adulthood?
No full textMulti-AP coordination in Wi-Fi 7 exploiting time resources sharing
No full textThe multi-AP coordination is a key feature of Wi-Fi 7 (EHT) and is a promising approach to improving the utilization of limited radio resources. However, the APs coordination requires the exchange of information among the APs in the coordination set in order to make the optimal sharing decision with regard to specific performance parameters. In this work, we present the control frames defined for this purpose and the transmission procedures defined in EHT for the multi-AP coordination. We implemented the new frames and EHT procedures in ns-3. Furthermore, we designed and implemented a scheduler with the aim to improving the performance of EHT network in non-saturated conditions by sharing the time resources, i.e., C-TDMA. Then, we assessed the performance of the proposed scheduler in ns-3. Multi-AP coordination through C-TDMA allows for reduction of the network latency of one order of magnitude while keeping the network throughput stable
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