Abstract
Network services are an important component of the Internet, which are used to expand network functions for third-party developers. Network function virtualization (NFV) can improve the speed and flexibility of network service deployment. However, with the evolution of the network, network service layout may become inefficient. Regarding this problem, this paper proposes a service chain migration (SCM) method with the framework of “software defined network + network function virtualization” (SDN+NFV), which migrates service chains to adapt to network evolution and improves the efficiency of the network service layout. SCM is modeled as an integer linear programming problem and resolved via particle swarm optimization. An SCM prototype system is designed based on an SDN controller. Experiments demonstrate that SCM could reduce the network traffic cost and energy consumption efficiently.
Highlights
Middleboxes [1], hardware-based network services, are widely deployed in the Internet and being recognized as important components of networks, such as their uses as firewalls, intrusion detection systems/intrusion prevention systems (IDS/IPS), load balancers, agencies, network address translators (NAT), and wide area network (WAN) optimizers etc
Simulations of network evolution and service chain migration are implemented in MATLAB
Each network node is connected with a server, and all servers have the same capacity ws and bandwidth resource ts. ts is set to 50 unit traffic per unit time, and the threshold Threshold is set to dws/3e
Summary
Service chains [2] are created by combining these service instances according to network policies and user requirements. Service chains satisfy various needs of users and provide value-added services to networks. In NFV, special hardware middleboxes are replaced by virtual services, service chain customization and dynamical creation can be achieved. Software defined networks (SDN) [6,7,8] are widely used to orchestrate network services according to policies and control traffic to pass special service chains [9,10,11,12]. The "SDN +NFV" network paradigm [13] provides a flexible, scalable, and adaptable architecture for deploying virtual services and creates new opportunities for service chain management
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