Method and OpenFlow Controller for Routing Control in Software Defined Networking

Abstract

The invention discloses a routing control method and an open flow controller in a software-defined network. The method includes: the OpenFlow controller OFC receives the data packet reported by the OpenFlow switch OFS; OFC determines whether the data packet is a repeated packet according to the key value stored in the cache, wherein the key value includes the characteristic value of the data packet; if the data packet is For duplicate packets, OFC sends a data packet to OFS, and instructs OFS to match the stored flow table to process the data packet or instruct OFS to transmit the data packet from the corresponding port; if the data packet is not a duplicate packet, OFC calculates the routing policy of the data packet, and Deliver the flow table to the OFS according to the routing policy, so that the OFS processes the data packets according to the delivered flow table. In the method of the embodiment of the present invention, if the data packet is a repeated packet, the data packet is directly sent to the OFS, and the OFS is instructed to match the stored flow table to process the data packet. In this way, for repeated packets, the OFC can only calculate the routing policy once, thereby reducing the calculation amount of the OFC.

Description

technical field [0001] The present invention relates to the communication field, and more specifically, to a routing control method and an OpenFlow controller in a software-defined network. Background technique [0002] In SDN (Software Defined Networking, software-defined network), the control plane is separated from the forwarding plane. The control plane formulates routing policies based on the entire network, and the forwarding plane processes data packets according to the received routing decisions. When the host initiates the request, the OFS (Open Flow Switch, OpenFlow switch) reports the data packet to the OFC (OpenFlow Controller, OpenFlow Controller). After the OFC completes the corresponding logic, it will generate corresponding OFS delivery flow entries on the N paths for the request. [0003] In the process, there may be two problems. First, during the period from when the host initiates a request to when the corresponding flow entry takes effect in the first...

AI Technical Summary

Problems solved by technology

Second, during the process of OFC delivering flow entries to OFSs on N paths, the network transmission time from OFC to each OFS is inconsistent with the time when each OFS takes effect on the instruction of this flow entry, which will also cause After the OFC delivers flow entries to the OFS on the path, the data packet is repeatedly reported to different OFS in the path, and the OFC will still repeat the calculation once or more times.

This solution can only take effect for the duplicate packets reported by the first OFS in the routing policy path, and cannot take effect for the duplicate packets reported by other OFSs in the routing policy path, which still causes the OFC to increase the amount of repeated calculations and send a large number of duplicate flow entries

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