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OpenFlow is the most promising architecture for future Software Defined Networks (SDNs). However, from the aspects of large-scale or carrier-grade networks, it still lacks some key components. For example, QoS (Quality of Service) provisioning is an indispensable part of such production networks. During the evolution of the OpenFlow standard, some QoS(More)
The rise of cloud services poses considerable challenges on the control of both cloud and carrier network infrastructures. While traditional telecom network services rely on rather static processes (often involving manual steps), the wide adoption of mobile devices including tablets, smartphones and wearables introduce previously unseen dynamics in the(More)
Mininet is a great prototyping tool which combines existing SDN-related software components (e.g., Open vSwitch, OpenFlow controllers, network namespaces, cgroups) into a framework, which can automatically set up and configure customized OpenFlow testbeds scaling up to hundreds of nodes. Standing on the shoulders of Mininet, we implement a similar(More)
In this demo, we show a novel method to multi-layer service orchestration in a multi-domain network. This method is a basic implementation of the three layered concept with multi-layer orchestration designed by the UNIFY project. A global orchestrator is capable of instantiating service elements, i.e., virtual network functions (VNFs), in separate domains.(More)
The short-term dynamics of competing high speed TCP flows could have surprising impacts on their long-term fairness. As a result, this could have a severe impact on the coexistence and, finally, the deployment feasibility of different seemingly promising proposals for the next generation networks. However, to our best knowledge, no root-cause analysis of(More)
One of the most promising solution for transport protocol over very high bandwidth-delay product networks is High-Speed TCP. However, little is known about its performance as well as its interaction with other elements of the network (such as the RED queue management). In this paper, a comprehensive control-theoretic analysis of HighSpeed TCP is provided.(More)
— This paper reports some results on the performance of HighSpeed TCP. Firstly, we find that the only publicly available simulation results in [6] are only qualitatively valid but not quantitatively and we show how to correct them. Secondly, our results show that the version of TCP used has minimal impact on the performance of HighSpeed TCP. Thirdly, we(More)
Due to its simplicity, transparency and performance, Flow Visor takes it all in today's virtualization tools for OpenFlow networks. We argue that this effectiveness comes at the price of intolerance towards diverse OpenFlow versions used simultaneously and also limited switch functionality. What is more Flow Visor based management frameworks cannot run and(More)
The limited capabilities of the switches renders the implementation of unorthodox routing and forwarding mechanisms as a hard task in OpenFlow. Our high level goal is therefore to inspect the possibilities of slightly smartening up the OpenFlow switches. As a first step in this direction we demonstrate (with Bloom filters, greedy routing and network coding)(More)
End-to-end service delivery often includes transparently inserted Network Functions (NFs) in the path. Flexible service chaining will require dynamic instantiation of both NFs and traffic forwarding overlays. Virtualization techniques in compute and networking, like cloud and Software Defined Networking (SDN), promise such flexibility for service providers.(More)