Node protection for a software defined replicator

1. A system, the system comprising:

one or more processors; and

one or more computer-readable non-transitory storage media, the one or more computer-readable non-transitory storage media comprising instructions that, when executed by the one or more processors, cause one or more components of the system to perform operations comprising:

selecting a primary node to replicate multicast traffic and forward the multicast traffic to a plurality of receivers, the selecting based in software;

selecting a plurality of secondary nodes to provide node-level redundancy for the primary node; and

providing the plurality of secondary nodes with synchronization information that enables the plurality of secondary nodes to replicate the multicast traffic, suppress the replicated multicast traffic at the plurality of secondary nodes, and forward the replicated multicast traffic to the plurality of receivers in response to the primary node becoming unavailable.

2. The system of claim 1 , wherein providing the plurality of secondary nodes with the synchronization information comprises:

determining, by a controller that participates in a control plane, one or more joins associated with the primary node, wherein the one or more joins join the primary node to one or more multicast streams from which the primary node obtains the multicast traffic; and

determining, by the controller, the synchronization information to provide to the one or more secondary nodes, the synchronization information based at least in part on the one or more joins associated with the primary node;

wherein providing the plurality of secondary nodes with the synchronization information is performed by the controller.

3. The system of claim 1 , wherein at least one of the plurality of secondary nodes is configured to act as a standby node when the primary node is active.

4. The system of claim 1 , wherein at least one of the plurality of secondary nodes is configured as an active node that performs load sharing with the primary node when the primary node is active.

5. The system of claim 1 , wherein the operations further comprise:

detecting a failure of the primary node based on information obtained from a Bidirectional Forwarding Detection (BFD) session; and

initiating a switchover to the plurality of secondary nodes based on detecting the failure of the primary node.

6. The system of claim 1 , wherein providing the plurality of secondary nodes with the synchronization information enables the plurality of secondary nodes to join one or more multicast streams associated with the primary node after the primary node has become unavailable.

7. The system of claim 1 , wherein providing the plurality of secondary nodes with the synchronization information enables the plurality of secondary nodes to join one or more multicast streams associated with the primary node before the primary node has become unavailable and to suppress the multicast traffic associated with the one or more multicast streams until after the primary node has become unavailable.

8. The system of claim 1 , further comprising configuring one of the plurality of secondary nodes with a same anycast Internet Protocol (IP) address as the primary node.

9. A method for use in a controller that participates in a control plane, the method comprising:

selecting a primary node to replicate multicast traffic and forward the multicast traffic to a plurality of receivers, the selecting based in software;

selecting a plurality of secondary nodes to provide node-level redundancy for the primary node; and

providing the plurality of secondary nodes with synchronization information that enables the plurality of secondary nodes to replicate the multicast traffic, suppress the replicated multicast traffic at the secondary nodes, and forward the replicated multicast traffic to the plurality of receivers in response to the primary node becoming unavailable.

10. The method of claim 9 , wherein providing the plurality of secondary nodes with the synchronization information comprises:

determining one or more joins associated with the primary node, wherein the one or more joins join the primary node to one or more multicast streams from which the primary node obtains the multicast traffic; and

determining the synchronization information to provide to the plurality of secondary nodes, the synchronization information based at least in part on the one or more joins associated with the primary node.

11. The method of claim 9 , further comprising:

detecting a failure of the primary node based on information obtained from a Bidirectional Forwarding Detection (BFD) session; and

initiating a switchover to the plurality of secondary nodes based on detecting the failure of the primary node.

12. The method of claim 9 , wherein the method provides the synchronization information in a manner that enables the secondary nodes to join one or more multicast streams associated with the primary node after the primary node has become unavailable.

13. The method of claim 9 , wherein the method provides the synchronization information in a manner that enables the secondary nodes to join one or more multicast streams associated with the primary node before the primary node has become unavailable and to suppress the multicast traffic associated with the one or more multicast streams until after the primary node has become unavailable.

14. One or more computer-readable non-transitory storage media embodying instructions that, when executed by a processor of a controller that participates in a control plane, cause the performance of operations including:

selecting a primary node to replicate multicast traffic and forward the multicast traffic to a plurality of receivers, the selecting based in software;

selecting plurality of secondary nodes to provide node-level redundancy for the primary node; and

providing the plurality of secondary nodes with synchronization information that enables the plurality of secondary nodes to replicate the multicast traffic, suppress the replication of multicast traffic at the secondary nodes, and forward the replicated multicast traffic to the plurality of receivers in response to the primary node becoming unavailable.

15. The one or more computer-readable non-transitory storage media of claim 14 , wherein providing the plurality of secondary nodes with the synchronization information comprises:

determining one or more joins associated with the primary node, wherein the one or more joins join the primary node to one or more multicast streams from which the primary node obtains the multicast traffic; and

determining the synchronization information to provide to the plurality of secondary nodes, the synchronization information based at least in part on the one or more joins associated with the primary node.

16. The one or more computer-readable non-transitory storage media of claim 14 , wherein the operations comprise configuring at least one of the plurality of secondary nodes to act as a standby node when the primary node is active.

17. The one or more computer-readable non-transitory storage media of claim 14 , wherein the operations comprise configuring at least one of the plurality of secondary nodes as an active node that performs load sharing with the primary node when the primary node is active.

18. The one or more computer-readable non-transitory storage media of claim 14 , wherein the operations further comprise:

detecting a failure of the primary node based on information obtained from a Bidirectional Forwarding Detection (BFD) session; and

initiating a switchover to the plurality of secondary nodes based on detecting the failure of the primary node.

19. The one or more computer-readable non-transitory storage media of claim 14 , wherein the operations provide the synchronization information in a manner that enables the secondary nodes to join one or more multicast streams associated with the primary node after the primary node has become unavailable.

20. The one or more computer-readable non-transitory storage media of claim 14 , wherein the operations provide the synchronization information in a manner that enables the secondary nodes to join one or more multicast streams associated with the primary node before the primary node has become unavailable and to suppress the multicast traffic associated with the one or more multicast streams until after the primary node has become unavailable.