Method and device for forwarding data flow, SDN controller and storage medium

A device for forwarding a data flow, applied to a Software Defined Network (SDN) controller, the device comprising:

• a memory that stores executable modules;
• and
• a processor coupled to the memory, that executes and facilitates execution of the executable modules, the processor comprising:
• an acquisition module, to acquire task information of an AI training task, wherein the task information comprises a communication model of the AI training task, an address of a source task node and an address of a destination task node, and the communication model is to indicate an AI training data transferring relationship between the source task node and the destination task node;
• a selection module, to select a forwarding path between the source task node and the destination task node based on topology information of a network and the communication model;
• a configuring module, to configure a forwarding flow table to each forwarding node on the forwarding path, causing each forwarding node to forward a data flow of the AI training task from the source task node to the destination task node along the forwarding path based on the forwarding flow table,
• wherein the AI training data transferring relationship between the source task node and the destination task node is a point-to-multipoint transferring relationship, or, the AI training data transferring relationship between the source task node and the destination task node is a multipoint-to-multipoint transferring relationship;
• the selection module is to:
• determine a first forwarding node corresponding to a plurality of the destination task nodes based on the topology information of the network, wherein a length sum of paths from the first forwarding node to the plurality of the destination task nodes is smaller than a length sum of paths from any other forwarding node to the plurality of the destination task nodes;
• select a first path between each source task node and the first forwarding node and selecting a second path between the first forwarding node and each destination task node based on the topology information of the network. wherein the first path corresponding to each source task node and the second path corresponding to each destination task node compose a forwarding path between this source task node and this destination task node;
• the configuring module is to:
• configure a corresponding multicast flow table to each forwarding node on a forwarding path corresponding to each source task node, wherein a destination address of the multicast flow table is an address of a multicast group formed by the plurality of the destination task nodes.