Abstract
Legacy IPv4 networks are strenuous to manage and operate. Network operators are in need of minimizing the capital and operational expenditure of running network infrastructure. The implementation of software-defined networking (SDN) addresses those issues by minimizing the expenditures in the long run. Legacy networks need to integrate with the SDN networks for smooth migration towards the fully functional SDN environment. In this paper, we compare the network performance of the legacy network with the SDN network for IP routing in order to determine the feasibility of the SDN deployment in the Internet Service provider (ISP) network. The simulation of the network is performed in the Mininet test-bed and the network traffic is generated using a distributed Internet traffic generator. An open network operating system is used as a controller for the SDN network, in which the SDN-IP application is used for IP routing. Round trip time, bandwidth, and packet transmission rate from both SDN and legacy networks are first collected and then the comparison is made. We found that SDN-IP performs better in terms of bandwidth and latency as compared to legacy routing. The experimental analysis of interoperability between SDN and legacy networks shows that SDN implementation in a production level carrier-grade ISP network is viable and progressive.
Highlights
Networks are organized groups of devices or nodes with communication links among them
Because we are at the early stage of software-defined networking (SDN) implementation in service provider networks, we found limited or no research related to routing performance comparison in terms of border gateway protocol (BGP) implementation in legacy networks and SDN in the service provider networks
Our approach in this study is not scoped towards migration techniques, instead we focused on the production level implementation of routing in hybrid SDN and its performance in comparison with legacy network to measure the viability of legacy network transition towards SDN by implementing open network operating system (ONOS)/SDN-IP
Summary
Networks are organized groups of devices or nodes with communication links among them. The logical centralization of the control logic makes it flexible and provides error-free policy deployment through high-level programming languages as an application programming interface (API), compared to the low-level device-specific configurations frequently used in legacy networks. An emulated network environment is created in Mininet for hybrid SDN implementation and routing performance evaluation by comparing legacy routing and SDN routing with their interoperability through an experimental analysis using an open network operating system (ONOS)/SDN-IP [6]. The viability of the SDN implementation in ISP/Telcos networks is evaluated. This experimental analysis evaluates the viability of SDN implementation in ISPs and Telcos networks. This encourages the service providers to smoothly migrate their legacy networks into SDN.
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