OpenFlow

OpenFlow is a protocol that allows the server to tell the network switch to send the packet. In a traditional network, each switch has proprietary software that tells what to do. With OpenFlow, packet-driven decisions are centralized so that the network can be independently programmed with individual switches and data center gear.

In a traditional switch, packet forwarding (data path) and high-level routing (control path) are on the same device. OpenFlow switch separates the data path from the control path. The data path portion remains on the switch; A different controller makes a high-level routing decision. Switches and controller interfaces through the OpenFlow protocol. This method, which is known as software-defined networking (SDN), allows more effective use of network resources with traditional networks. Openflow has obtained favor in applications such as VM (Virtual Machine) Mobility, Mission-Critical Network and next-generation IP-based mobile network.

Many established companies, including IBM, Google and HP, have either fully utilized, or have announced their intention to support the Openflow standard. A headquartered SDN firm, Big Switch Networks, located in Palo Alto, California, have implemented the Openflow Network, which runs on top of the traditional network, so it is possible to keep virtual machines anywhere in the data center to regain the trapped computing capability. goes. In early 2012, Google's internal network ran entirely on OpenFlow.