A flow table backup method and device

Abstract

This specification provides a flow table backup method and device, the method includes: the controller periodically detects whether the east-west and north-south traffic is normal, and further determines whether there is an increase or deletion in the controller compared with the previous synchronization cycle In the case of the flow table, if the traffic is normal and there is no increase or deletion of the flow table, it means that the flow table at this time is a flow table that can allow the business to run normally, so the controller backs up the flow table in this case. In this way, it can be backed up to a flow table that can make traffic forwarding normal.

Description

technical field

[0001] This specification relates to the technical field of software-defined networking, and in particular to a flow table backup method and device. Background technique

[0002] SDN (Software Defined Network) is a new type of network architecture. Its core idea is to separate the control layer and forwarding layer of network switching equipment, and to centralize and flexibly control network traffic through the controller, so as to provide core network and application Provide a good platform for innovation.

[0003] figure 1 It is a network diagram of an SDN network. When the virtual machine VM1 wants to access VM3 in the east-west direction, or access the external network in the north-south direction, it must rely on the flow table on the virtual switch vswitch (also called ovs) for forwarding. Therefore, for the host overlay For networking, the flow table on the vswitch host is very important.

[0004] There are three main opportunities for the controll...

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