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Live Virtual machine (VM) migration is a promising solution for data center (DC) administrators to achieve a wide range of objectives - from load balancing to disaster evacuation. Ideally, live VM migration is seamless and the challenge is to minimize the downtime during which the VM is not responding to requests or providing the service. The duration of the downtime is mainly influenced by the migration...
ETRI distributed cloud platform provides customers with optimal computing and storage resources over remotely distributed micro datacenters connected over multi-domain transport networks. It requires dynamic SDN control to utilize transport network resource efficiently. This paper introduces implementation of transport network orchestration to control multi-domain transport networks for the distributed...
Data centers offer computational resources with various levels of guaranteed performance to the tenants, through differentiated Service Level Agreements (SLA). Typically, data center and cloud providers do not extend these guarantees to the networking layer. Since communication is carried over a network shared by all the tenants, the performance that a tenant application can achieve is unpredictable...
Network Functions Visualization (NFV) builds upon virtualization technology and allows the decoupling of network services from dedicated and complex hardware-based appliances. This decoupling allows network providers to install these functions in commercial off-the-shelf hardware reducing the overall capital and operational expenses. In order to provide complete and high quality services to the end...
Network function virtualization (NFV) has drawn much attention in recent years, where some network functions that used to be deployed on specific hardware have become virtualized instances on general servers to achieve more scalability and flexibility. In a data center, service function chaining (SFC) makes a workflow traverse different network functions in a specific order to provide different levels...
Content Centric Network (CCN) has become a heated research topic recently, as it is proposed as an alternative of the future network. The routers in CCN have the caching abilities and the caching strategies affect the system performance greatly. Each content in CCN is associated with a popularity, which is determined by the corresponding requested times. Popularity-aware caching scheme caches the...
The article describes an approach to create virtual cloud network laboratory. The topology is created with the visual editor. Then a script for network deployment is created. It is based on the scheme description. For implementation of this approach the cloud system based on OpenNebula has been created. The experiment has shown the efficiency of using cloud systems in IT education. Even the small...
Peer-to-Peer network topology is well known for its beneficial characteristic, like good scalability high robustness. In spite of this, web browsers are still using the standard server-client topology for data download. In this paper we investigate the methods of implementing Peer-to-Peer data streaming in web browsers, using only JavaScript, without the need of any third party plugin. We are using...
Significant research effort has been made on formulating new topologies to meet the requirements of current and future large-scale data centers. Nowadays data centers may include tens of thousands of servers, leading to an urgent need for higher bandwidth, better reliability, easier management and lower latency. This paper investigates the potential of using software-defined networks (SDNs) in Extreme...
today's cloud computing Data Centers (DCs) contain tens of thousands of servers with highly significant and remarkable bandwidth requirements as the demands of cloud computing applications, social applications, multimedia contents, and data intensive analysis are dramatically rising. Even thus, current DC technologies have following problems. First, power consumption of a Data Center Network (DCN)...
MTC services are undergoing rapid increase; billions of MTC connections can be anticipated in a few years. When supporting MTC services in telecommunications networks, MTC traffic characteristics and its unique service requirements should be exploited in order to optimize resource utilization and offer satisfactory service quality for all devices. In this paper, we present an Information-Centric Virtual...
Information-centric networking (ICN) promises to improve content-oriented services by enabling in-network caching and supporting optimal content request forwarding. To achieve this goal, different content caching and request forwarding schemes are proposed in multiple ICN architectures. However, they differ from each other in whether pervasive caching is adopted, and whether nearest-replica routing...
We present a reconfigurable dragonfly architecture for High-Performance-Computing (HPC) systems leveraging optical-circuit-switching. An SDN control plane monitors network traffic characteristics and optimizes the connectivity. Software-controlled reconfiguration of the optically interconnected topology is experimentally demonstrated.
In this paper, we consider a data-flow management mechanism for data center networks, in which a centralized controller called arbiter manages data flows. We propose a simple algorithm for the arbiter to distribute flows over different time points and paths, in a preemptive scheduling and traffic load-balancing manner. The proposed algorithm is based on table-driven resource reservation, in which...
Data Center is a multifunctional infrastructure that consists of thousands of compute servers and network devices. The fat-tree topology is widely adopted because of its efficiency and safety. However, the fat-tree topology can not completely meet the time-varying communication needs from physical and virtual machines. 60 GHz wireless technology was then incorporated into data centers for its high...
The article introduces the reasons for realisation of the remote laboratory of computer networks which originate from the comparisons of the alternatives of working with the specialised networking hardware. These use the principle of virtualisation or simulation of such devices as an alternative for obtaining competencies from the area of computer networks. Due to this reason, this article discusses...
The ability to remotely discover and configure devices in an automation network without the need for prior knowledge of the network topology or the identities of hosts and servers is a key requirement for industrial networks and cyber-physical systems. The Dynamic Host Configuration Protocol (DHCP) as a UDP-based standardized network protocol became very successful in computer networking and also...
An overlay network's efficiency can be improvedby taking advantage of its network structure. However, beforea structured network can be constructed, nodes has to be topologicallysorted. One of the common form of topological sortingis linearization where nodes are arranged in a linear order withrespect to its identifiers. Linearization is not a difficult task,however, to keep nodes in a correct state...
Deployment of PCE (Path Computation Element) architecture in high-speed MPLS/GMPLS networks is at present widely accepted and helps to run path setup operations for applications with explicitly defined objective functions and also with QoS requirements. The paper reports on recent research investigations with PCE-based path computation employing 3-layer traffic engineering (TE) system: PCE module...
Information Centric Networking (ICN) is a proposal for a future network architecture that relies on in-network caching. While still an open problem, the default caching strategy in current ICN implementations is that routers cache everything that passes through them. It has been shown in previous work, that such a universal mode of caching is inefficient and highly redundant. In this work, we propose...
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