Software defined network link fault recovery method based on in-band control

Abstract

The invention sets forth a software defined network (SDN) link fault recovery method based on in-band control, and belongs to the technical field of communication networks. Firstly, an SDN controller acquires the whole network topology by using an LLDP (Link Layer Discovery Protocol) and generates a control network, calculates a backup path for a link on the control network and transmits the path to a corresponding group table. Then, once the link has a fault, a switch sends fault information to the controller, the switch is triggered to feed real-time traffic information of the network back to the controller, and the controller updates the network topology and the traffic information. Finally, according to the current network topology and traffic information, the sum of resource consumption and feed of the path is calculated, thus an optimal recovery path is selected and a flow table is transmitted to the corresponding switch to realize recovery of the link fault. The system recovers control flow by adopting the backup path and adaptively recovers data flow in an in-band control network, thereby realizing reasonable allocation of link resources during fault recovery and improving the overall performance of the network.

Description

technical field [0001] The invention belongs to the technical field of communication networks, and relates to a software-defined network link fault recovery method based on in-band control. Background technique [0002] Restricted by economic factors, low-cost network equipment is generally used in large-scale networks, so there are various failures such as link failure, server failure and switch failure. more common phenomenon. Therefore, the failure recovery strategy and fault tolerance mechanism to ensure the reliable service capability of the network has become an urgent problem to be solved in current research. Fault management in SDN differs from traditional networking in many ways. In a traditional network, when a link fails, a distributed network device (such as a router) rebuilds the routing path and updates the routing table according to the changed topology information. However, in an SDN network, routing decisions are made by a centralized controller. The con...

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Problems solved by technology

[0004] Through the research on the fault recovery in the existing SDN, it can be concluded that most of the current solutions to the link fault problem in the SDN focus on the backup path of the local recovery method, but this recovery method does not make full use of the characteristics of the centralized control of the SDN architecture, and Does not take into account the distribution of the entire network traffic after the failure recovery

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