Failure protection method based on ring protection link, device, and system

A network controller, wherein the network controller is applied to a ring protection link, nodes in the ring protection link comprises a forwarding device in a software-defined network (SDN), the network controller comprising:

• a receiver, configured to receive a failure message sent by a first node, wherein a priority of the failure message is higher than that of another packet received by the network controller, the failure message comprises information used to indicate a failure, and the first node is any one node in the ring protection link;
• a processor, configured to obtain, according to the failure message, data information about port state changes that are of the nodes and that are caused by the failure;
• and
• a transmitter, configured to send a high-priority switching message to each of the nodes in the ring protection link, so that each of the nodes updates a local media access control (MAC) address table according to the switching message, to complete failure protection based on the ring protection link, wherein the switching message comprises the data information about port state changes that are of the nodes and that are caused by the failure,
• wherein the ring protection link further comprises a non-SDN device interconnected with the SDN and the first node comprises an SDN device.

A node, applied to a ring protection link, wherein the node is a forwarding device in a software-defined network (SDN), the node comprising:

• a processor configured to detect a failure and to block a port of the node that corresponds to the failure when the failure is detected;
• a transmitter configured to send a high-priority failure message to a network controller, wherein the failure message comprises information used to indicate the failure;
• a receiver configured to receive a high-priority switching message sent by the network controller, wherein the switching message comprises data information about port state changes that are of all nodes in the ring protection link and that are caused by the failure;
• and
• wherein the processor is further configured to update a local media access control (MAC) address table according to the switching message to complete failure protection based on the ring protection link;
• and
• wherein the ring protection link further comprises a non-SDN device interconnected with the SDN and the node comprises an SDN device.

A system, comprising:

• a network controller and a node;
• wherein the network controller is configured to:
• receive a failure message sent by a node, wherein a priority of the failure message is higher than that of another packet received by the network controller, the failure message comprises information used to indicate a failure, and the node is any one node in the ring protection link,
• obtain, according to the failure message, data information about port state changes that are of the nodes and that are caused by the failure, and
• send a high-priority switching message to each of the nodes in the ring protection link, so that each of the nodes updates a local media access control (MAC) address table according to the switching message, to complete failure protection based on the ring protection link, wherein the switching message comprises the data information about port state changes that are of the nodes and that are caused by the failure;
• and
• wherein the node is a forwarding device in a software-defined network (SDN), and the node is configured to:
• detect a failure,
• block a port that is of the node and that corresponds to the failure when the failure is detected,
• send the high-priority failure message to the network controller, wherein the failure message comprises the information used to indicate the failure,
• receive the high-priority switching message sent by the network controller, and
• update the local media access control MAC address table according to the switching message to complete failure protection based on the ring protection link;
• and
• wherein the ring protection link further comprises a non-SDN device interconnected with the SDN and the node comprises an SDN device.