Energy has become an important issue in many areas due to increasing energy costs and environmental issues. The Internet is one of the major energy consuming areas. In this paper 1 , we proposed an energy-aware routing and resource management model for large-scale networks by adapting an SDN (Software Defined Networking) based approach. Controller uses pre-established multi-paths (PMPs) and perform routing, admission control based on these paths. PMPs are turned on or off based on traffic conditions to save energy. The experimental results verify the achievements of the proposed model under various traffic conditions.
Volume of the Internet traffic has increased significantly in recent years. Service providers (SPs) are now striving to make resource management and considering dynamically changing large volume of network traffic. In this context, software defined networking (SDN) has been alluring the attention of SPs, as it provides virtualization, programmability, ease of management, and so on. Yet severe scalability issues are one of the key challenges of the SDN due to its centralized architecture. First of all, SDN controller may become the bottleneck as the number of flows and switches increase. It is because routing and admission control decisions are made per flow basis by the controller. Second, there is a signaling overhead between the controller and switches since the controller makes decisions on behalf of them. In line with the aforementioned explanations, this paper proposes an SDN-based scalable routing and resource management model (SRRM) for SPs. The proposed model is twofold. SRRM performs routing, admission control, and signaling operations (RASOs) in a scalable manner.Additionally, resource management has also been accomplished to increase link use. To achieve high degree of scalability and resource use, pre-established paths (PEPs) between each edge node in the domain are provided. The proposed controller performs RASOs based on PEPs. The controller also balances the load of PEPs and adjusts their path capacities dynamically to increase resource use. Experimental results show that SRRM can successfully perform RASOs in a scalable way and also increase link use even under heavy traffic loads. KEYWORDScontroller design, OpenFlow, pre-established paths, resource management, software-defined net- working, virtualizationInt J Commun Syst. 2018;31:e3530.wileyonlinelibrary.com/journal/dac Software-defined networking (SDN) 1 is an emerging network architecture. It allows network operators to perform disjoint network operations (eg, load balancing and resource management) in a single framework by separating the control and forwarding functions. Briefly, Figure 1 depicts 3 layers of SDN. The infrastructure layer (data plane) is the layer at the bottom. Entities in this layer usually performs actions of forwarding, dropping, and altering packets but not limited to them. Control layer (control plane) is logically centralized and performs decision making on behalf of the entities in data plane. The application layer contains applications and services that use the services provided in control layer. The separation of control and forwarding functions of SDN allows the network control to be programmable, brings intelligence to network with centralized management, simplifies network design and management through open standards, and so on. Therefore, SDN allures the attention of SPNs.Although SDN has many benefits, there are several limitations as well. 2 First of all, SDN controller is the only entity that makes decision on behalf of all the underlying switches. As SDN controller makes per-flow basis online decisions, it ma...
Software Defined Networking (SDN) has become a promising network architecture that simplifies the network control, management and deployment of differentiated services. SDN architecture decouples control and data planes. Control functions are moved to a logically centralized entity called controller. The underlying infrastructure solely performs forwarding. Most of the previous studies focus on using SDN in data centers. In this paper 1 , we propose scalable routing and resource management model for SDN based intra-domain networks. To virtualize the underlying network, we use pre-established multi-paths (PMP) between each ingress-egress switch. SDN-Controller performs admission control, routing, load balancing and path resizing functions based on these paths. The experimental results show that the proposed model significantly improves routing and signaling scalability, network resource utilization and decreases admission control time.
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