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With the increasing complexity of networks, Software Defined Networks (SDNs) have been developed to help administrators configure and operate network services with controllers such as Beacon, OpenDaylight and Floodlight. These controllers provide a suitable platform for high bandwidth applications. In this paper, several SDN controllers are evaluated using different network topologies. Some controllers...
We present a heuristic algorithm to address the optimization problem of routing and spectrum allocation, aimed at traffic protection and restoration in an elastic optical network. The algorithm searches for working and backup disjoint paths, using the shared path protection scheme. It divides the spectrum into two partitions and prioritizes slots in one of them for backup path traffic. The way the...
Ubiquitous in-network caching is one of the important aspects of the Information-Centric Networking (ICN), which has been a hot topic of ICN research. Many works have tried to propose better caching schemes to solve the drawbacks of the default en-route scheme, but most of them are insufficient to improve performance of entire network for just considering single layer optimization factor. Also considering...
Aiming at efficiently mapping multiple virtual optical networks (VONs) on a shared substrate network. This paper proposes a load balancing algorithm that is based on key-link and resources contribution degree (RCD) for VONs mapping (KLRVM) in elastic optical networks (EONs). In this algorithm, virtual nodes mapping gets the network status according to the proposed RCD, and comprehensively considers...
The growth of Internet traffic requires new strategies to offload congested Internet Protocol (IP) links. The introduction of sliceable optical networks resulted in appurtenance of new possibilities to manage this problem. In this paper, a dynamic sliceable optical bypassing policy is proposed to omit congested IP links in the software-defined networking (SDN) architecture. The experimental verification...
Topology reconstruction enables optical data center networks (DCNs) to adapt to dynamic traffic patterns, but may interrupt ongoing data transmissions. We propose a cross-layer mechanism to deliver traffic over multiple optical paths and adjust their TCP congestion windows coordinately. The experimental results show that it can effectively reduce the impacts on flow transmission.
Data centers are core infrastructure of cloud computing. Network virtualization in these centers is a promising solution that enables coexistence of multiple virtual networks on a shared infrastructure. It offers flexible management, lower implementation cost, higher network scalability, increased resource utilization, and improved energy efficiency. In this paper, we consider switch-centric data...
Enterprise Networking (EN) services are source of high revenues for carriers. However, the traditional way of providing and selling those to enterprise and business customers is ossified and unsatisfactory for users. High prices, static connections and slow time to provision, make enterprise users doubtful about whether guaranteed connectivity is worth the price and push them to look for alternative...
Multi-path allocation has been proposed as a simple way to achieve traffic protection in different networking domains. In this work dual-path allocation is proposed for Elastic Optical Networks (EON) assuming dynamic offered traffic, and its performance is quantified by simulation. Indeed, dual-path allocation is compared with partial dedicated path protection assuming different scenarios. In addition...
Emerging neural network accelerators are often implemented as many-core chips and rely on a network-on-chip to handle the huge amount of inter-neuron traffic. The wellknown mesh and tree are the most popular topologies in prior many-core neural network accelerator designs. However, these conventional topologies suffer from high diameter, low bisection bandwidth, and poor collective communication support...
In this paper, we propose a modeling approach for a Content-Centric Networking (CCN) network by considering the dynamics of its transport layer protocol. Transport layer protocols for CCN have mainly been investigated through simulation experiments because CCN itself is a complicated network architecture compared with IP, and the complex interaction between CCN caching and the behavior of a transport...
Routing Algorithm is an important mechanism which decides data transferring path in a network. Several existed routing algorithms are derived from a fundamental of graph theory with shortest path approach. A lot of additional network metrics were applied to serve the best quality of service (QoS) to end devices. However, a selected path from the existed algorithms can suffer from additional end-to-end...
Sleep mechanism(SM) is often used to design green network, however, sleep mechanism must take data loss, network performance and other situations into consideration. Due to hierarchical and centralized control, SDN makes it simple to deploy new applications. SDN is becoming more and more popular in new network applications. In this paper, a new implementation of SM based on SDN is proposed, the SM...
In order to ensure the transmit speed and quality, it is critical to adopt efficient path selection technique for load balancing in complex networks. However, traditional balancing technique is unable to possess global knowledge of the whole network and lacks the ability to find the optimal path. Software Defined Networks (SDN) provides an approach to obtain whole network status. But, the performance...
Software-defined networking (SDN) has separated control and forwarding planes, which is a powerful approach to enable network virtualization by SDN hypervisors to share physical SDN networks among multiple virtual SDN in cloud data center. However, the centralized control and virtual network shared physical network are delicately weak and easy to failure if virtual topology embedding is not properly...
Erasure-coded storage systems have gained considerable adoption recently since they can provide the same level of reliability with significantly lower storage overhead compared to replicated systems. However, background traffic of such systems - e.g. repair, rebalance, backup and recovery traffic - often has large volume and consumes significant network resources. Independently scheduling such tasks...
To speed up the recovery from network failures, an extensive list of methods have been proposed. Many failure-recovery methods are proposed based on tunneling or marking, which increase the packet processing burden on routers and consume extra bandwidth. With neither tunneling nor marking, existing methods guarantee recovery from any single-link failure if a detour for the failed link exists, but...
Fifth generation (5G) wireless networks will target at energy and spectrum efficient solutions to cope with the increasing demands in capacity and energy efficiency. To achieve this joint goal, dense networks of small cells (SCs) are expected to overlay the existing macro cells. In parallel, for the SC connection to the core network, a promising solution lies in a mesh network of high capacity millimeter...
Despite being industry standard, load balancing via virtual machine (VM) migration methods in modern cloud data centers still exhibit two major performance issues: resulting system load balancing degree and total time till balanced state. Over the years research has been conducted to improve these metrics. Yet due to the fact that these issues influence each other, it has been a challenge to achieve...
In this paper, we propose a novel data center network architecture named FFTree. Compared to widely adopted industrial solutions including fat-tree, this architecture can provide even higher aggregate bandwidth and richer path availability. Most importantly, FFTree provisions unique flexibility so that its topology and performance can be tailored with great freedom before its deployment. The fine...
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