Multicast-based forwarding for distributed gateway

A non-transitory computer-readable storage medium storing instructions to:

• join, from a network device operating as a tunnel endpoint and a gateway in an overlay network, a multicast group in an underlay network of the overlay network, wherein a gateway IP address is allocated to a plurality of gateways of the overlay network, and wherein the multicast group is associated with a multicast IP address and includes the plurality of gateways;
• receive, from a client device coupled to the network device, a packet with the gateway IP address as a destination address;
• encapsulate the packet with an encapsulation header with the multicast IP address as a destination address;
• and
• forward the encapsulated packet via a multicast tree in the underlay network.

A computer system, comprising:

• a processing resource;
• a memory;
• and
• a non-transitory computer-readable storage medium storing instructions that when executed by the processing resource cause the computer system to:
• join, from a network device operating as a tunnel endpoint and a gateway in an overlay network, a multicast group in an underlay network of the overlay network, wherein a gateway IP address is allocated to a plurality of gateways of the overlay network, and wherein the multicast group is associated with a multicast IP address and includes the plurality of gateways;
• receive, from a client device coupled to the network device, a packet with the gateway IP address as a destination address;
• encapsulate the packet with an encapsulation header with the multicast IP address as a destination address;
• and
• forward the encapsulated packet via a multicast tree in the underlay network.