OpenFlow-based distributed controller system in SDN network environment

Abstract

The invention discloses an OpenFlow-based distributed controller system in SDN network environment. The system comprises a decision-making device module, a controller resource pool, an OpenFlow control server and OpenFlow switches; the decision-making device module is a core of a function of the whole system and is responsible for detection of active_controllers, i.e. controllers in a working state, and, when the decision-making device module is in an overload state, a load balance decision is made, a new controller is called from the resource pool to join work, load conditions of the active_controllers are periodically checked, and the resource recovery of the controllers is completed; the controller resource pool collects all the active_controllers, i.e., a controller set in an idle stale, and dynamic increase and decrease of the resource pool are controlled by a decision-making device; the OpenFlow control server monitors an own load in real time, and the decision-making device is notified of a load condition when the OpenFlow control server is in an overload state; the OpenFlow control server monitors a command transmitted from the decision-making device furthermore, and completes own load condition reporting or own role switching; and the OpenFlow switches complete a data forwarding function, and participates in a load balance process when the controller is in the overload state.

Description

technical field

[0001] The invention relates to a distributed controller system in an OpenFlow-based SDN network environment, belonging to the technical field of the Internet. Background technique

[0002] SDN (namely: software-defined network) is a new network innovation architecture, which is the trend of future network development. SDN emphasizes that the control plane and data plane of network equipment want to be separated, and the functions of the control plane are brought together to a centralized controller in the network. The SDN controller implements functions such as network topology collection, route calculation, flow table generation and delivery, and network management and control. Network layer devices are only responsible for traffic forwarding and policy execution.

[0003] The separation of forwarding and control leads to the centralized control logic. The SDN controller has the global static topology of the network, the dynamic forwarding table informatio...

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