Avoiding stuck subscriber sessions on a disaggregated broadband network gateway

1. A user plane (UP) device, comprising:

one or more memories; and

one or more processors to:

receive a control packet indicating a logout associated with a subscriber session;

store an indication of the logout associated with the subscriber session;

determine, after storing the indication, that the logout associated with the subscriber session has not been completed within a subscriber logout period; and

transmit an error indication indicating that the logout has not been completed within the subscriber logout period.

2. The UP device of claim 1 , wherein the indication is stored in state information associated with the subscriber session.

3. The UP device of claim 1 , wherein the error indication is transmitted for reception by a control plane (CP) device associated with managing subscriber sessions, the CP device being disaggregated from the UP device.

4. The UP device of claim 1 , wherein the error indication is transmitted in a packet forwarding control protocol (PFCP) session report request message via a state control interface.

5. The UP device of claim 1 , wherein the one or more processors are further to:

determine that the UP device is connected to a control plane (CP) device associated with managing subscriber sessions; and

generate a message including the error indication based at least in part on determining that the UP device is connected to the CP device.

6. The UP device of claim 1 , wherein the one or more processors, to determine that the logout has not been completed within the subscriber logout period, are to:

start a logout timer after receiving the control packet indicating the logout; and

determine that the logout timer has expired prior to completion of the logout.

7. The UP device of claim 1 , wherein the one or more processors, to determine that the logout has not been completed within the subscriber logout period, are to:

identify a timestamp associated with the control packet indicating the logout; and

determine, based on the timestamp, that a threshold amount of time has passed without the logout being completed.

8. The UP device of claim 1 , wherein the one or more processors are further to:

receive, after transmitting the error indication, a logout notification associated with the logout; and

delete the indication of the logout associated with the subscriber session based on receiving the logout notification.

9. The UP device of claim 8 , wherein the logout notification is received via a state control interface.

10. A control plane (CP) device, comprising:

one or more memories; and

one or more processors to:

receive an error indication indicating that a logout associated with a subscriber session has not been completed within a time period from when an indication of the logout was stored;

process the logout based at least in part on receiving the error indication; and

transmit, based on processing the logout, a logout notification associated with the logout.

11. The CP device of claim 10 , wherein the error indication is received from a user plane (UP) device associated with managing subscriber sessions, the UP device being disaggregated from the CP device.

12. The CP device of claim 10 , wherein the error indication is received in a packet forwarding control protocol (PFCP) session report request message via a state control interface.

13. The CP device of claim 10 , wherein the logout notification is transmitted via a state control interface.

14. A method, comprising:

receiving, by a user plane (UP) device, a control packet indicating a logout associated with a subscriber session;

storing, by the UP device, an indication of the logout associated with the subscriber session;

determining, by the UP device and after storing the indication, that the logout associated with the subscriber session has not been completed within a subscriber logout period; and

transmitting, by the UP device, an error indication indicating that the logout has not been completed within the subscriber logout period;

receiving, by a control plane (CP) device, the error indication;

processing, by the CP device, the logout based at least in part on receiving the error indication; and

transmitting, by the CP device and based on processing the logout, a logout notification associated with the logout.

15. The method of claim 14 , wherein the indication is stored in state information associated with the subscriber session.

16. The method of claim 14 , wherein the UP device is disaggregated from the CP device.

17. The method of claim 14 , wherein the error indication is included in a packet forwarding control protocol (PFCP) session report request message via a state control interface between the UP device and CP device.

18. The method of claim 14 , further comprising:

determining, by the UP device, that the UP device is connected to the CP device; and

generating a message including the error indication based at least in part on determining that the UP device is connected to the CP device.

19. The method of claim 14 , further comprising:

receiving, by the UP device, the logout notification associated with the logout; and

deleting the indication of the logout associated with the subscriber session based on receiving the logout notification.

20. The method of claim 14 , wherein the logout notification is transmitted via a state control interface between the UP device and the CP device.