Selection of multicast router interfaces in an L2 switch connecting end hosts and routers, which is running IGMP and PIM snooping

摘要

Multicast traffic received by a subnet that uses IGMP/PIM snooping may be efficiently processed so that only required multicast router interfaces are used. A router may, for example, receive a source-specific PIM join/prune message indicating that a multicast receiver of the multicast traffic is to join/leave a multicast group to receive/stop traffic from a multicast source; determine whether the router is a first hop router relative to a subnet of the multicast source; and forward, when the router is a first hop router relative to the subnet of the multicast source and is a non-designated router, the source-specific PIM join/prune message towards the subnet.

主权项

1. A network device comprising:
a memory to store instructions; and one or more processors to execute the instructions to:
receive a source-specific protocol independent multicast (PIM) message indicating that a device is to join or leave a multicast traffic group that receives multicast traffic from a multicast source;determine, based on receiving the source-specific PIM message, whether the network device is one hop away from a subnet corresponding to the multicast source;determine, based on receiving the source-specific PIM message, whether the network device is a non-designated network device for the subnet of the multicast source; andselectively forward the source-specific PIM message towards the subnet of the multicast source based on whether the network device is one hop away from the subnet and whether the network device is the non-designated network device for the subnet.