Synchronization of mobile client multicast

1. A non-transitory computer readable medium comprising instructions which, when executed by one or more processors on one or more devices, causes performance of operations comprising:

subsequent to a client associating with a first access node and the client being communicatively coupled with a first controller through the first access node: storing information on one or more of: active broadcast sessions for the client or active multicast sessions for the client;

subsequent to the client associating with a second access node and the client being communicatively coupled with a second controller through the second access node, wherein the stored information is received by the second controller from the first controller;

detecting, by the second controller, that the client is communicatively coupled to the second controller through the second access node;

responsive at least to detecting that the client is communicatively coupled to the second controller: sending, by the second controller, an inquiry for the information on one or more of: the active broadcast sessions for the client or the active multicast sessions for the client;

receiving, by the second controller, the information on one or more: the active broadcast sessions for the client or the active multicast sessions for the client;

using, by the second controller, the information to establish one or more of: the active broadcast sessions for the client or the active multicast sessions for the client,

wherein the second controller comprises a hardware processor.

2. The medium of claim 1 wherein the inquiry is sent by the second controller prior to the client transmitting any request to the second access node to join a broadcast session or a multicast session.

3. The medium of claim 1 wherein the operations further comprise establishing, by the second controller, the one or more of: the active broadcast sessions for the client or the active multicast sessions for the client using an IGMP proxy of the second controller.

4. The medium of claim 1 wherein the operations further comprise receiving, by the second controller from the

first controller, a forwarded unicast message directed to the client.

5. The medium of claim 1 wherein the information on the one or more: the active broadcast sessions for the client or the active multicast sessions for the client is received by the second controller from the first access node.

6. A system comprising:

a first controller including a first hardware processor;

a second controller including a second hardware processor;

the system being configured to perform operations comprising:

subsequent to a client associating with a first access node and the client being communicatively coupled with a first controller through the first access node: storing information on one or more of: active broadcast sessions for the client or active multicast sessions for the client;

subsequent to the client associating with a second access node and the client being communicatively coupled with a second controller through the second access node, wherein the stored information is received by the second controller from the first controller;

detecting, by the second controller, that the client is communicatively coupled to the second controller through the second access node;

responsive at least to detecting that the client is communicatively coupled to the second controller: sending, by the second controller, an inquiry for the information on one or more of: the active broadcast sessions for the client or the active multicast sessions for the client;

receiving, by the second controller, the information on one or more: the active broadcast sessions for the client or the active multicast sessions for the client;

using, by the second controller, the information to establish one or more of: the active broadcast sessions for the client or the active multicast sessions for the client.

7. The system of claim 6 wherein the inquiry is sent by the second controller prior to the client transmitting any request to the second access node to join a broadcast session or a multicast session.

8. The system of claim 6 wherein the operations further comprise establishing, by the second controller, the one or more of: the active broadcast sessions for the client or the active multicast sessions for the client using an IGMP proxy of the second controller.

9. The system of claim 6 wherein the operations further comprise receiving, by the second controller from the

first controller, a forwarded unicast message directed to the client.

10. The system of claim 6 wherein the information on the one or more: the active broadcast sessions for the client or the active multicast sessions for the client is received by the second controller from the first access node.

11. A method comprising:

subsequent to a client associating with a first access node and the client being communicatively coupled with a first controller through the first access node: storing information on one or more of: active broadcast sessions for the client or active multicast sessions for the client;

subsequent to the client associating with a second access node and the client being communicatively coupled with a second controller through the second access node, wherein the stored information is received by the second controller from the first controller;

detecting, by the second controller, that the client is communicatively coupled to the second controller through the second access node;

responsive at least to detecting that the client is communicatively coupled to the second controller: sending, by the second controller, an inquiry for the information on one or more of: the active broadcast sessions for the client or the active multicast sessions for the client;

receiving, by the second controller, the information on one or more: the active broadcast sessions for the client or the active multicast sessions for the client;

using, by the second controller, the information to establish one or more of: the active broadcast sessions for the client or the active multicast sessions for the client,

wherein the second controller comprises a hardware processor.

12. The method of claim 11 wherein the inquiry is sent by the second controller prior to the client transmitting any request to the second access node to join a broadcast session or a multicast session.

13. The method of claim 11 further comprising establishing, by the second controller, the one or more of: the active broadcast sessions for the client or the active multicast sessions for the client using an IGMP proxy of the second controller.

14. The method of claim 11 further comprising receiving, by the second controller from the first controller, a forwarded unicast message directed to the client.

15. The method of claim 11 wherein the information on the one or more: the active broadcast sessions for the client or the active multicast sessions for the client is received by the second controller from the first access node.