Method of Flow Distribution Management in Systems Based on OpenFlow

The current architecture of data center networks is a combination of Ethernet switches and routers. However, this architecture cannot satisfy the requirements of these networks. Ethernet switches are flexible, have simple configuration, but are not scalable. Routers provide better scalability and efficient use of bandwidth, but are costly. This architecture has a noticeable overhead configuration and maintenance. So, if we had a larger Layer 2 networks, number of routers and consequently the costs will be lessened. Many methods are presented for this purpose.In this paper introduce some main requirement center data networking and characteristic of proposed methods. Among of these methods, OpenFlow is preferred.But the control overhead of OpenFlow is high. One way to reduce the control overhead by separating big and small flows and letting the controller to control only the big flows. ECMP routing is a method that can be used for routing small flows. However OpenFlow does not support ECMP. In this paper, a new method based on OpenFlow is proposed to replace ECMP. The proposed method can achieve performance comparable to ECMP.