Preventing high availability pairs of network devices from sending out duplicate multicast traffic flows

A non-transitory machine-readable storage medium to store machine-readable instructions that, when executed by a given router of a high availability pair of routers, cause the given router to:

• receive a join request representing a request by a client device to join a multicast group associated with a source address and a multicast group address;
• classify a given interface of the given router based on whether the given interface is associated with a next hop toward the source address and whether the given interface is associated with the other router of the high availability pair of routers;
• and
• responsive to the join request, selectively export static multicast route information via the given interface based on the classification.

A system comprising:

• a pair of network devices to collectively provide a virtual network switch, wherein the pair of network devices comprises:
• a first network device, wherein the first network device is associated with a primary role for the pair of network devices, and the first network device to, responsive to the pair of network devices receiving a join request, export first static multicast route information via a first network interface of the first network device, wherein the first join request represents a request by a client device to join a multicast group associated with a source address and a multicast group address, and the first static multicast route information identifies the first network interface as being an incoming interface to receive multicast traffic associated with the multicast group, identifies an outgoing interface of the first network device for the multicast traffic, identifies the source address and identifies the group address;
• and
• a second network device, wherein the second network device is associated with a secondary role for the pair of network devices, and the second network device to, responsive to the pair of network devices receiving the join request:
• determine whether a second network interface of the second network device is associated with a next hop toward the source address and whether the second network interface is aggregated with an interface of the first network interface;
• and
• responsive to the determination, selectively export second static multicast route information via the second network interface.