Flow table consistency updating method in software-defined network

Abstract

The invention discloses a flow table consistency updating method in a software defined network. While whether the flow table needs to be updated or not is determined, a reason for updating the flow table is also determined; for flow table updating caused by different reasons, a link to be updated in links needing to be subjected to flow table updating is updated by adopting different methods respectively; a group of to-be-updated data streams with the least number are determined; under the condition that the link is not congested, a new path for each data flow to be updated is selected; whether a loop is formed between the new path and the old path of the to-be-updated data flow or not is determined; the situations that loops are formed on new and old paths and the loops are not formed arerespectively based on different updating methods. After the switches to be updated on the new path and the old path are subjected to set division according to different flow table updating operationtypes, consistency updating is carried out on the flow tables of the switches according to the corresponding sequence for obtained switch sets; the problems of black holes, loops and the like can be prevented in a complex network environment.

Description

technical field [0001] The invention belongs to the network security field of network update, and more specifically relates to a flow table consistency update method in a software-defined network. Background technique [0002] Network update caused by network state changes is a very common problem. To achieve correct network update in traditional networks requires a lot of complicated and cumbersome operations, such as modifying the Interior Gateway Protocol (IGP) to update the network configuration. As the scale of the network becomes larger and the structure becomes more and more complex, a new network architecture that can improve some defects of the traditional network has become an urgent need in the industry, and the software-defined network (Software Defined Network, SDN) was born accordingly. The SDN controller communicates with the data plane switch through the southbound interface protocol OpenFlow, and provides application services for the upper layer through the ...

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Problems solved by technology

[0008] Aiming at the above defects or improvement needs of the prior art, the present invention provides a flow table consistent update method in a software-defined network, the purpose of which is to solve the problem that the existing method does not consider the cause of the update of the flow table and relies on the assumed known There are technical problems of black holes and loops when updating the flow table in a more complex network environment caused by updating the old path and the new path

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