Flood optimization to distribute multihome source information in network

A system comprising:

• routers of a network to provide connectivity from a multicast receiver to edge routers multihomed to a multicast source of multicast traffic on an Ethernet segment, wherein:
• the routers are configured to perform creating a limited flood domain in the network for the Ethernet segment, wherein the limited flood domain includes boundary routers of the routers positioned to make a final decision as to which of the edge routers to send a multicast join for the multicast traffic;
• the boundary routers are configured to perform, upon receiving a source announcement that announces the multicast source is active on a particular edge router of the edge routers of the Ethernet segment, locally storing information, provided by the source announcement, which includes a multicast address for the multicast source and identifies a link to the particular edge router;
• and
• a boundary router of the boundary routers is configured to perform, upon receiving the multicast join, sending the multicast join to the particular edge router using the multicast address and the link.

Non-transitory computer readable media encoded with instructions that, when executed by one or more processors of routers of a network configured to provide connectivity from a multicast receiver to edge routers multihomed to a multicast source of multicast traffic on an Ethernet segment, cause the one or more processors to perform:

• creating a limited flood domain in the network for the Ethernet segment, wherein the limited flood domain includes boundary routers of the routers positioned to make a final decision as to which of the edge routers to send a multicast join for the multicast traffic;
• by the boundary routers, upon receiving a source announcement that announces the multicast source is active on a particular edge router of the edge routers of the Ethernet segment, locally storing information, provided by the source announcement, which includes a multicast address of the multicast source and identifies a link to the particular edge router;
• and
• by a boundary router of the boundary routers, upon receiving the multicast join, sending the multicast join to the particular edge router using the multicast address and the link.