Control network determination method and device

Abstract

An embodiment of the invention provides a control network determination method and device. The method includes: determining multiple first candidate control networks used for a first controller and multiple forwarding nodes at least according to states of physical links between the first controller and the forwarding nodes corresponding to the first controller; for each forwarding node in each first candidate control network, responding to that control flow of the forwarding node can be transmitted to a second controller via a local rerouting mode or reverse path forwarding mode when fault happens between the forwarding node and a previous single-hop node of the forwarding node in the first candidate control network, and determining the forwarding node as a protectable forwarding node in the first candidate control network; at least according to the number of the protectable forwarding nodes in each first candidate control network, determining an optimal control network from the first candidate control networks.

Description

technical field [0001] The embodiments of the present application relate to the field of network technologies, and in particular, to a method and device for determining a control network. Background technique [0002] Software-Defined Networking (SDN for short) is a network architecture in which control and forwarding are separated. In SDN, the forwarding plane is composed of extremely simple forwarding nodes (switches), whose forwarding behavior is completely controlled by a logically centralized controller (controller). When the network fails, the communication between the controller and the forwarding nodes may be interrupted. In this case, the lost forwarding nodes can still forward data packets according to existing forwarding rules, but these forwarding nodes cannot request forwarding rules for new flows from the controller, thus causing packet loss. In addition, because some SDN control applications (such as load balancing, traffic engineering, etc.) need to know th...

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Problems solved by technology

In this case, the lost forwarding nodes can still forward data packets according to the existing forwarding rules, but these forwarding nodes cannot request forwarding rules for new flows from the controller, resulting in packet loss

In addition, because some SDN control applications (such as load balancing, traffic engineering, etc.) need to know the real-time network status, the communication interruption between the controller and the forwarding node will also make the control plane unable to grasp the accurate network status, resulting in network performance degradation

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