Abstract-We present HNOCS (Heterogeneous Network-

Network services, such as security, load-balancing, and monitoring, are an indisputable part of modern networking infrastructure and are traditionally realized as specialized appliances or middleboxes. Middleboxes complicate the management, the deployment, and the operations of the entire network. Moreover, they induce network performance issues and scalability limitations by requiring huge amounts of traffic to be, often sub-optimally redirected, and sometimes redundantly processed. Recent trends of server virtualization and Network Function Virtualization (NFV) exacerbate these scalability and performance issues. In this paper, we present EnforSDN -a new management approach that exploits SDN principles to decouple the policy resolution layer from the policy enforcement layer in network service appliances. Our approach improves the enforcement management, network utilization and communication latency, without compromising the policy and the functionality of the network. Using emulated SDN-based data center environment, we demonstrate higher throughput and lower latency achieved with EnforSDN, as compared to a baseline SDN network. In addition, we show that EnforSDN reduces the overall network appliances load, as well as the forwarding tables size.

We introduce a novel evaluation methodology to analyze the delay of a wormhole routing based NoC with variable link capacities and a variable number of virtual channels per link. This methodology can be utilized to analyze different heterogeneous NoC architectures and traffic scenarios for which no analysis framework has been developed before. In particular, it can replace computationally-extensive simulations at the inner-loop of the link capacities and virtual channels allocation steps of the NoC topology optimization process. Our analysis introduces a set of implicit equations which can be efficiently solved iteratively. We demonstrate the accuracy of our approximation by comparing the analysis results to a simulation model for several use-cases and synthetic examples. In addition, we compare the analysis with simulation results for a chip-multi-processor (CMP) using SPLASH-2 and PARSEC traces for both homogeneous and heterogeneous NoC configurations.

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