Flow sampling method and system for software-defined network

Abstract

The invention provides a flow sampling method and system for a software-defined network, and relates to the field of communication, in particular to a flow sampling method and system for a software-defined network. The method comprises the following steps: an SDN controller is used for acquiring flow sampling requirement from a north interface or a management interface; the SDN controller is used for matching the flow sampling requirement with current flow table entry information and SDN forwarding device information, generating a set table entry and a guide flow table entry for performing sampling behavior, and sending the set table entry and the guide flow table entry to an SDN forwarding device, wherein the set table entry comprises a sampling ratio, and the guide flow table entry comprises flow information and associated set table entry ID; the SDN forwarding device is used for sampling the flow according to the guide flow table entry and the set table entry after receiving the set table entry and the guide flow table entry. The technical scheme provided by the invention is applicable to the software-defined network; according to the method, the SDN flow sampling with service continuity is achieved.

Description

technical field [0001] The present invention relates to the communication field, in particular to a software-defined network flow sampling method and system. Background technique [0002] Today's Internet (Internet) based on TCP / IP has achieved great success after more than 40 years of development. It is closely related to people and has become one of the indispensable infrastructures for work, study and life. The TCP / IP-style Internet, because of the division of labor and organization principle of "simple processing by network / network equipment, and complex processing to the host side / side" at the beginning of its design, has formed the current status of the Internet architecture: the host side The application layer protocol can be modified and deployed very conveniently and flexibly, so the application layer software has been developed by leaps and bounds, and the functions of the application layer have been greatly enriched; in sharp contrast to it is the network layer, a...

AI Technical Summary

Problems solved by technology

But its flaws are: (1) A certain repair only solves a local problem in a small area; (2) The existing improvement may introduce short-term benefits but be destructive in the long run, such as NAT, or local benefits will damage the whole (3) It may not be easy for a patch to be "compatible" with future modifications; (4) After multiple patches, the Internet has become more and more "thick", complex, and inflexible, beyond the simple design of the Internet. The bearing capacity of the architecture; (5) Some inherent problems in the traditional Internet architecture are difficult to fundamentally solve

However, the shortcomings of this solution are: (1) Since the new network may not be compatible with the existing Internet, the infrastructure of the original network needs to be completely replaced, so there are problems with network deployment and smooth transition; (2) How to establish a new system structure, and whether the establishment of a new architecture can solve the problems faced by the current and future networks is also very risky; (3) It is necessary to rebuild a test network suitable for the new architecture, and the evolution cost is high

[0010] Currently, under the SDN / OpenFlow architecture, only the matching and mirroring functions of the flow table are supported, and the flow sampling function has not yet been realized, which causes the scalability problem of this function during actual network deployment, which is mainly reflected in the reception and analysis of mirrored traffic. On the performance bottleneck of the device, a large amount of mirroring traffic will inevitably cause an impact on the analysis device, increasing the processing burden and deployment cost of the analysis device

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