Multicast source move detection for layer-2 interconnect solutions

1. A method comprising:

detecting a remote site, wherein the remote site has been newly designated as an active source;

deleting active source entries associated with a previously designated source on a plurality of connected network devices upon detection of the remote site;

receiving a designation that the network device is the newly designated active source device; and

announcing the source MAC address information of the network device to all connected receivers.

2. The method of claim 1 , wherein the step of detecting occurs on a first network device associated with a first site, wherein the first site comprises the previously active source device.

3. The method of claim 2 , further comprising detecting the remote site based on MAC address information.

4. The method of claim 2 , wherein the first network device is an Overlay Transport Virtualization (OTV) edge network device.

5. The method of claim 4 , wherein the active source entries are stored in a mapping database.

6. The method of claim 5 , wherein the mapping database stores active source entries based at least in part on MAC addresses associated with the active source entries.

7. The method of claim 6 , wherein the mapping database is sorted based on (VLAN, S, G) route information.

8. The method of claim 1 , further comprising withdrawing active source entries from a plurality of remote sites through an OTV-Intermediate System to Intermediate System (ISIS) Group Membership-Link State Packet (GM-LSP) update.

9. The method of claim 8 , further comprising adding the plurality of remote sites to a multicast tree directed to the newly designated active source.

10. The method of claim 9 , further comprising employing a deterministic process to add the plurality of remote sites to the multicast tree.

11. A method comprising:

announcing to all connected receivers source MAC address information associated with a local network device upon receiving a designation of the local network device as an active source device;

receiving an update message regarding previous source information; and

removing an active source entry related to the previous source from a mapping database.

12. The method of claim 11 , further comprising: updating a multicast tree with the source MAC address information.

13. The method of claim 12 , further comprising: receiving multicast traffic routed by the updated multicast tree.

14. The method of claim 13 , further comprising: adding a plurality of remote sites to the multicast tree.

15. An OTV edge network device comprising:

a mapping database comprising source MAC address information;

a multicast database comprising information identifying locally discovered multicast sources; and

a processor, wherein the processor is configured to:

receive an announcement that a remote network device has been designated an active source device;

delete active source entries corresponding to a previously designated active source device in at least one of the: mapping database and the multicast database;

receive a designation that the network device is the newly designated active source device; and

announce the source MAC address information of the network device to all connected receivers.

16. The network device of claim 15 wherein the processor is further configured to:

determine interested local receivers by referring to the multicast database; and

handle join requests to one or more multicast data trees.

17. The network device of claim 15 , wherein the announcement is made through OTV ISIS messages.

18. The network device of claim 15 , wherein source MAC address moves with the designated active source device.