Data Flow Redirection Method and System, Network Device, and Control Device

A data flow redirection method, comprising:

• determining, by a control device, redirection routing information of a data flow, the redirection routing information of the data flow comprising destination address information of the data flow and redirection next hop information of a target network device;
• and
• sending, by the control device, a control message to the target network device, the control message carrying the redirection routing information of the data flow and a redirection routing indication, the redirection routing indication instructing to convert the redirection routing information of the data flow into a forwarding entry in a target forwarding table, and tablespace of the target forwarding table being greater than tablespace of a flow specification forwarding table of the target network device.

A network device, comprising:

• a receiver configured to receive a control message from a control device, the control message carrying redirection routing information of a data flow and a redirection routing indication, the redirection routing information of the data flow comprising destination address information of the data flow and redirection next hop information of the network device, the redirection routing indication instructing to convert the redirection routing information of the data flow into a forwarding entry in a target forwarding table, and tablespace of the target forwarding table being greater than tablespace of a flow specification forwarding table of the network device;
• and
• a processor coupled to the receiver and configured to convert the redirection routing information of the data flow into the forwarding entry in the target forwarding table according to the redirection routing indication received by the receiver.

A control device, comprising:

• a processor configured to determine redirection routing information of a data flow, the redirection routing information of the data flow comprising destination address information of the data flow and redirection next hop information of a target network device;
• and
• a transmitter coupled to the processor and configured to send a control message to the target network device, the control message carrying the redirection routing information of the data flow determined by the processing processor and a redirection routing indication, the redirection routing indication instructing to convert the redirection routing information of the data flow into a forwarding entry in a target forwarding table, and tablespace of the target forwarding table being greater than tablespace of a flow specification forwarding table of the target network device.