Multicast source discovery mechanism to avoid multicast-traffic sync between active multi-homing peers or any cast gateway l2 stretch

A system comprising:

• one or more processors;
• and
• at least one computer-readable storage medium having stored therein instructions which, when executed by the one or more processors, cause the one or more processors to perform operations comprising:
• receiving, at a first provider edge router of a plurality of provider edge routers, multicast traffic of one or more multicast flows from a multicast source;
• refraining from transmitting the multicast traffic from the first provider edge router to at least one other edge router of the plurality of provider edge routers in response to receiving the multicast traffic from the multicast source;
• originating, at the first provider edge router in response to receiving the multicast traffic from the multicast source, a multicast routing message including a multicast source indicator of the multicast source, a multicast group identifier of the multicast traffic, and a loopback address of the first provider edge router as a type-length value (TLV) included as part of the multicast routing message;
• flooding the multicast routing message into a multicast core network, from the first provider edge router, for controlling traffic in the one or more multicast flows through the multicast core network to the first provider edge router;
• and
• receiving one or more multicast joins at the first provider edge router from the multicast core network for establishing the one or more multicast flows through the multicast core network to the first provider edge router based on the multicast routing message including the loopback address of the first provider edge router.

A non-transitory computer-readable storage medium having stored therein instructions which, when executed by a processor, cause the processor to perform operations comprising:

• receiving, at a first provider edge router of a plurality of provider edge routers, multicast traffic of one or more multicast flows from a multicast source;
• refraining from transmitting the multicast traffic from the first provider edge router to at least one other edge router of the plurality of provider edge routers in response to receiving the multicast traffic from the multicast source;
• originating, at the first provider edge router, a multicast routing message including a multicast source indicator of the multicast source, a multicast group identifier of the multicast traffic, and a loopback address of the first provider edge router;
• and
• flooding the multicast routing message, through a PIM flooding mechanism and source discovery (PFM-SD) message, into a multicast core network, from the first provider edge router, for controlling traffic in the one or more multicast flows through the multicast core network to the first provider edge router.