Method and device for realizing interaction of optical channel data unit protection tangent rings

A method for realizing interaction of optical channel data unit (ODUk) protection tangent rings, comprising:

• for a shared protection ring ODUk SPRing in the tangent rings:
• selecting a node used for protection of the ODUk in the ODUk SPRing;
• selecting a sending service unit used by a protected service in the ODUk SPRing as a protected sending unit,
• selecting sending service units comprising a first sending working unit and a second sending working unit with two different transmission directions, and a first sending protection unit and a second sending protection unit with the two different transmission directions;
• selecting a receiving service unit used by the protected service in the ODUk SPRing as a protected receiving unit,
• selecting receiving service units comprising a first receiving working unit and a second receiving working unit with the two different transmission directions, and a first receiving protection unit and a second receiving protection unit with the two different transmission directions;
• and
• establishing a connection between a receiving service unit and the protected sending unit with the same transmission direction on the node, or establishing a connection between a sending service unit and the protected receiving unit with the same transmission direction on the node;
• and establishing two virtual nodes on the node when the node is an intersection node, and establishing connections between the receiving service unit and the protected sending unit, and between the sending service unit and the protected receiving unit respectively on each direction of two directions through one of the virtual nodes.