Path computation systems and methods in control plane based networks for photonic layer topologies

1. A method of path computation and setup via a control plane in a network with partial connectivity in a photonic layer, the method comprising:

responsive to one or more nodes in the photonic layer having partial connectivity, receiving connectivity information of the one or more nodes in signaling messages at an originating node providing setup messages;

storing the connectivity information of the one or more nodes and utilizing the connectivity information for path computation;

after path setup of a service through the one or more nodes, periodically sending probe signaling messages over the service; and

receiving probe response messages containing updated connectivity information of the one or more nodes and storing the updated connectivity information.

2. The method of claim 1 , further comprising:

updating one or more protect routes for the service based on the updated connectivity information.

3. The method of claim 1 , wherein the partial connectivity comprises a direct attach port which is an Optical Channel (OCH) which is not connected to all Optical Multiplex Section (OMS) ports at a node.

4. The method of claim 1 , wherein the partial connectivity comprises regenerator banks with constrained connectivity in the photonic layer.

5. The method of claim 1 , wherein photonic layer topology comprising drop port connectivity is not flooded in the control plane.

6. The method of claim 1 , wherein the periodically sending is sent on an order of several minutes.

7. The method of claim 1 , further comprising:

prior to providing the setup messages, performing path computation assuming full connectivity in the photonic layer; and

responsive to the receiving connectivity information of the one or more nodes with the partial connectivity, updating the path computation based on the connectivity information.

8. A node in a network with partial connectivity in a photonic layer, the node comprising:

one or more ports; and

a controller operating a control plane, communicatively coupled to the one or more ports, and configured to

responsive to one or more nodes in the photonic layer having partial connectivity, receive connectivity information of the one or more nodes in signaling messages responsive to sent setup messages;

store the connectivity information of the one or more nodes and utilize the connectivity information for path computation;

after path setup of a service through the one or more nodes, periodically send probe signaling messages over the service; and

receive probe response messages containing updated connectivity information of the one or more nodes and store the updated connectivity information.

9. The node of claim 8 , wherein the controller is further configured to

update one or more protect routes for the service based on the updated connectivity information.

10. The node of claim 8 , wherein the partial connectivity comprises a direct attach port which is an Optical Channel (OCH) which is not connected to all Optical Multiplex Section (OMS) ports at a node.

11. The node of claim 8 , wherein the partial connectivity comprises regenerator banks with constrained connectivity in the photonic layer.

12. The node of claim 8 , wherein photonic layer topology comprising drop port connectivity is not flooded in the control plane.

13. The node of claim 8 , wherein the periodically sending is sent on an order of several minutes.

14. The node of claim 8 , wherein the controller is further configured to

prior to providing the setup messages, performing path computation assuming full connectivity in the photonic layer; and

responsive to the receiving connectivity information of the one or more nodes with the partial connectivity, updating the path computation based on the connectivity information.

15. A network with partial connectivity in a photonic layer, the network comprising:

an originating node;

one or more intermediate nodes; and

a terminating node communicatively coupled to the originating node and the one or more intermediate nodes,

wherein, responsive to one or more nodes in the photonic layer having partial connectivity of the one or more intermediate nodes or the terminating node, the originating node receives connectivity information of the one or more nodes in signaling messages responsive to sent setup messages,

wherein, the originating node stores the connectivity information of the one or more nodes and utilize the connectivity information for path computation,

wherein, after path setup of a service through the one or more nodes, the originating node periodically sends probe signaling messages over the service, and

wherein the originating node receives probe response messages containing updated connectivity information of the one or more nodes and stores the updated connectivity information.

16. The network of claim 15 , wherein the originating node is configured to update one or more protect routes for the service based on the updated connectivity information.

17. The network of claim 15 , wherein the partial connectivity comprises a direct attach port which is an Optical Channel (OCH) which is not connected to all Optical Multiplex Section (OMS) ports at a node.

18. The network of claim 15 , wherein the partial connectivity comprises regenerator banks with constrained connectivity in the photonic layer.

19. The network of claim 15 , wherein photonic layer topology comprising drop port connectivity is not flooded in the control plane.

20. The network of claim 15 , wherein the originating node periodically sends probe signaling messages on an order of several minutes.