Dell EMC SmartFabric OS10 User Guide Release 10.5.0

PIM-SM

PIM sparse mode (PIM-SM) is a multicast routing protocol for networks with receivers that are sparsely distributed. Receivers have to explicitly send a join message to join particular groups or sources. PIM join and prune messages are used to join and leave multicast distribution trees.

PIM-SM uses shared trees with the root node being the rendezvous point (RP). All multicast sources use the RP to route the traffic to the receiver. The last hop router (LHR) sends an (*,G) join message towards the RP. The designated router connected to the first hop router (FHR) encapsulates multicast data that comes from the multicast source in PIM control messages and sends it via unicast to the RP as PIM register messages. The RP sends an (S, G) join towards the source. When the RP receives native data traffic from the source, it sends a register stop message to the FHR.

OS10 supports static and dynamic configuration of an RP address for a multicast group.

To keep the PIM-SM state alive, all PIM neighbors send periodic hello messages.

You must enable PIM-SM on each of the participating interfaces. Be sure to have multicast routing enabled on the system. To do this, use the ip multicast-routing command from CONFIGURATION mode.

OS10# configure terminal
OS10(config)# interface vlan 100
OS10(conf-if-vl-100)# ip pim sparse-mode