Method and device for issuing flow tables

Abstract

The invention provides a method and a device for issuing flow tables. The method and the device are applied to a software defined network (SDN) controller. The method includes setting corresponding first table item priority parameters for first flow table items after first flow table item issuing request messages submitted by switches are received; issuing first flow table items to the switches; comparing the priority of the first flow table items to the priority of second flow table items successfully issued to the switches when issued flow table overflow failure messages of the first flow table items transmitted by the switches are received, and acquiring the second flow table items with the priority inferior to the priority of the first flow table items; informing the switches of deleting the second flow table items and then issuing the first flow table items to the switches again. The method and the device have the advantages that the priority of service is set under the condition that hardware resources of the switches are used up, the service with the inferior priority is deleted, accordingly, the service with the superior priority can be assuredly normally forwarded, and the service transmission quality of an SDN can be improved.

Description

technical field [0001] The present invention relates to the technical field of network communication, in particular to a method and device for delivering a flow table in an SDN (Software Defined Network, software-defined network) network. Background technique [0002] SDN network is a new type of network innovation architecture. Its core idea is to separate the control plane of network equipment from the forwarding plane to achieve flexible control of network traffic and provide a good platform for core networks and related applications. In the SDN network, the SDN controller collects network topology information, calculates the forwarding path, and delivers the flow table guiding service traffic forwarding to each switch in the forwarding path. After the switch receives the service packet, it forwards it according to the flow table delivered by the SDN controller. [0003] Since the hardware resources that can carry the flow table on the switch are limited, and in the prio...

AI Technical Summary

Problems solved by technology

However, if the service corresponding to the failed flow entry has a higher service priority, the service cannot be forwarded through the flow table, so the transmission quality of the high-priority service required by the user in the SDN network cannot be guaranteed.

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