Link aggregation group (LAG) support on a software-defined network (SDN)

1. A system, comprising:

a software-defined network (SDN) controller comprising a processing circuit and logic executable by the processing circuit to:

receive a port addition indication that a logical port is configured on a switching device, the switching device being coupled to the SDN controller and a second device, wherein the logical port represents a link aggregation group (LAG) that comprises at least two links between the switching device and the second device, and the port addition indication includes a logical port identifier for the logical port; and

add the logical port identifier for the logical port to a logical index for all logical ports in software-defined switching devices coupled to the SDN controller;

send, to the switching device, a request for statistics related to the logical port, the statistics including packets sent, packets received, and delay; and

receive, from the switching device, the statistics related to the logical port, in response to the request.

2. The system according to claim 1 , wherein the logic is further executable by the processing circuit to:

receive an indication of a speed change for the logical port;

store a speed for the logical port in association with the logical port identifier within the logical index;

receive an indication of a status change for the logical port;

indicate a status for the logical port in the logical index, in response to receiving the indication of the status change; and

send, to the switching device, a message comprising at least one packet to be sent out via the logical port.

3. The system according to claim 1 , wherein the logic is further executable by the processing circuit to:

send a port modification message to the switching device, where the port modification message indicates at least one modification to an operation of the logical port;

send a flow modification message to the switching device, where the port modification message indicates at least one modification to a flow profile for the logical port; and

send, to the switching device, a message comprising at least one packet to be sent out via the logical port.

4. The system according to claim 1 , wherein the logic is further executable by the processing circuit to:

receive a logical port removal indication from the switching device, the logical port removal indication being a port remove message that comprises a logical port identifier for the logical port; and

remove the logical port identifier from the logical index in response to receiving the logical port removal indication.

5. The system according to claim 1 , wherein the logic is further executable by the processing circuit to:

receive an indication of a speed change for the logical port from the switching device, the indication of the speed change representing at least one membership change for the logical port; and

store a speed for the logical port in the logical index in association with the logical port identifier for the logical port.

6. The system according to claim 1 , wherein the logic is further executable by the processing circuit to:

receive an indication of a status change for the logical port from the switching device, the status change representing whether the logical port is operational or non-operational; and

indicate a status for the logical port in the logical index selected from a group of statuses comprising: operational and non-operational.

7. The system according to claim 1 , wherein the logic is further executable by the processing circuit to send a port modification message to the switching device that indicates at least one modification to operation of the logical port.

8. The system according to claim 1 , wherein the logic is further executable by the processing circuit to send a flow modification message to the switching device that indicates at least one change to a flow profile for the logical port.

9. The system according to claim 1 , wherein the logic is further executable by the processing circuit to receive, from the switching device, indication that a packet has been received on the logical port in response to a determination that the switching device has received the packet in via the logical port.

10. The system according to claim 1 , wherein the logic is further executable by the processing circuit to:

send a port modification message to the switching device, where the port modification message indicates at least one modification to an operation of the logical port;

send a flow modification message to the switching device, where the port modification message indicates at least one modification to a flow profile for the logical port;

send, to the switching device, a request for statistics related to the logical port, the statistics including packets sent, packets received, and delay;

receive, from the switching device, the statistics related to the logical port, in response to the request; and

send, to the switching device, a message comprising at least one packet to be sent out via the logical port.

11. A computer-implemented method comprising:

receiving a port addition indication at a software-defined network (SDN) controller that a logical port is configured on a switching device, the switching device being coupled to the SDN controller and a second device, wherein the logical port represents a link aggregation group (LAG) that comprises at least two links between the switching device and the second device, and the port addition indication includes a logical port identifier for the logical port; and

adding the logical port identifier for the logical port to a logical index for all logical ports in software-defined switching devices coupled to the SDN controller;

sending, to the switching device, a request for statistics related to the logical port, the statistics including packets sent, packets received, and delay; and

receiving, from the switching device, the statistics related to the logical port, in response to the request.

12. The method according to claim 11 , further comprising:

receiving an indication of a speed change for the logical port;

storing a speed for the logical port in association with the logical port identifier within the logical index;

receiving an indication of a status change for the logical port;

indicating a status for the logical port in the logical index, in response to receiving the indication of the status change; and

sending, to the switching device, a message comprising at least one packet to be sent out via the logical port.

13. The method according to claim 11 , further comprising:

sending a port modification message to the switching device, where the port modification message indicates at least one modification to an operation of the logical port;

sending a flow modification message to the switching device, where the port modification message indicates at least one modification to a flow profile for the logical port; and

sending, to the switching device, a message comprising at least one packet to be sent out via the logical port.

14. The method according to claim 11 , further comprising:

receiving an indication of a speed change for the logical port from the switching device, the indication of the speed change representing at least one membership change for the logical port;

storing a speed for the logical port in the logical index in association with the logical port identifier for the logical port;

receiving an indication of a status change for the logical port from the switching device, the status change representing whether the logical port is operational or non-operational;

indicating a status for the logical port in the logical index selected from a group of statuses comprising: operational and non-operational;

sending a port modification message to the switching device that indicates at least one modification to operation of the logical port; and

sending a flow modification message to the switching device that indicates at least one change to a flow profile for the logical port.

15. The method according to claim 11 , further comprising:

receiving, from the switching device, indication that a packet has been received on the logical port in response to a determination that the switching device has received the packet in via the logical port;

sending to the switching device a message comprising at least one packet to be sent out via the logical port; and

sending a second statistics request to the switching device to request second statistics related to the switching device.

16. The method according to claim 11 , further comprising:

receiving an indication of a speed change for the logical port in response to at least one determination selected from: a determination that at least one port has been added as member ports of the logical port, and a determination that at least one member port of the logical port is removed to reflect a change in overall speed of the logical port; and

receiving an indication of a status change for the logical port at the SDN controller in response to the logical port changing a status selected from a group of statuses comprising: operational and non-operational.

17. The method according to claim 11 , further comprising:

sending a port modification message to the logical port specifying instructions to modify operation of the logical port;

sending a flow modification message to the logical port specifying instructions to change a flow profile for the logical port;

receiving at the SDN controller an indication that a packet has been received on the logical port in response to a determination that the switching device has received the packet in via the logical port; and

sending to the logical port a message comprising at least one packet to be sent out via the logical port.

18. A computer program product, the computer program product comprising a computer readable storage medium having program code embodied therewith, the program code executable by a processor to:

receive a port addition indication that a logical port is configured on a switching device, the switching device being coupled to a software-defined network (SDN) controller and a second device, wherein the logical port represents a link aggregation group (LAG) that comprises at least two links between the switching device and the second device, and the port addition indication includes a logical port identifier for the logical port; and

add the logical port identifier for the logical port to a logical index for all logical ports in software-defined switching devices coupled to the SDN controller;

send, to the switching device, a request for statistics related to the logical port, the statistics including packets sent, packets received, and delay; and

receive, from the switching device, the statistics related to the logical port, in response to the request.