OpenFlow technology is emerging rapidly with the potential of increasing the flexibility in network management and operation. The technology introduces the OpenFlow switch, which is a cost-effective but well-functional switch implementation. The switch enables network programmability as well as various ways of forwarding packets. Since the version 1.1, the specification of OpenFlow switch intro...

Software-defined networking (SDN) offers unprecedented control over network operation, allowing network operators programmatic control over switches’ forwarding behavior. In the compass-rose metaphor for networks, an SDN controller sends commands that modify switches’ forwarding tables (so-called flowmods), queues, counters, etc., by means of the southbound API. Several different southbound API...

Recently, several researchers have proposed adopting software-defined networking (SDN) concepts for mobile network architectures, particularly for LTE-evolved packet core (LTE/EPC). Although several new designs have been introduced for architectures based on SDN or its concrete realization, Openflow, few studies have presented in-depth discussions of real procedures that are relevant to such ar...

In recent years, Open Flow is becoming a popular network architecture. It can provide fine-grained monitor to the flows in the network. The separation of control plane and data plane makes it flexible. However, to the best of our knowledge, most OpenFlow protocols are designed for wired networks. And the switch state and controller bottleneck are still major issues in OpenFlow network. In this ...

The size and amount of e-science data sets is growing rapidly. Keeping up with the network demand in order to transfer these data sets over the Internet is a challenge. Single links do not have enough capacity anymore. Therefore we need to install more interfaces in the servers and use all available paths in the network. In this paper we describe two new technologies that help to optimally use ...

In many real-world OpenFlow-based SDN deployments, the ability to program heterogeneous forwarding elements built with different forwarding architectures is a desirable capability. In this paper, we discuss a data plane programming framework suitable for a flexible and protocol-oblivious data plane and show how OpenFlow can evolve to provide a generic interface for platform-independentprogrammi...

Software Defined Networking (SDN) is a new paradigm for communication networks which separates the control plane from the data plane of forwarding elements. This way, SDN constitutes a flexible architecture that allows quick and easy configuration of network devices. This ability is particularly useful when networks have to be adapted to changing traffic volumes of different applications runnin...

Optical Orthogonal Frequency Division Multiplexing (O-OFDM), which transmits high speed optical signals using multiple spectrally overlapped lower-speed subcarriers, is a promising candidate for supporting future elastic optical networks. In contrast to previous works which focus on Coherent Optical OFDM (CO-OFDM), in this paper, we consider the direct-detection optical OFDM (DDO-OFDM) as the t...

Software-defined networking offers a device-agnostic programmable framework to encode new network functions. Externally centralized control plane intelligence allows programmers to write network applications and to build functional network designs. OpenFlow is a key protocol widely adopted to build programmable networks because of its programmability, flexibility and ability to interconnect het...

The fundamental feature of an OpenFlow network is that the controller is responsible for the initial establishment of every flow by contacting related switches. Thus the performance of the controller could be a bottleneck. This paper shows how this fundamental problem is addressed by parallelism. The state of the art OpenFlow controller, called NOX, achieves a simple programming model for contr...