Netgear FSM726v3 7000 Series Managed Switch Administration Guide for Software - Page 468

NETGEAR Managed Switches Software Administration Manual, Release 8.0 a. From the main menu, select Routing > Multicast >IGMP->Interface Configuration. A screen similar to the following displays. Figure 28-39 b. Under IGMP Routing Interface Configuration, scroll down to interface 1/0/24and select the checkbox for 1/0/24. c. In the IGMP Routing Interface Configuration, select Enable in the Admin Mode field. d. Click Apply to save the settings. PIM-SM Configuration Protocol-Independent Multicast Sparse Mode (PIM-SM) is used to efficiently route multicast traffic to multicast groups that may span wide area networks where bandwidth is a constraint. PIM-SM uses shared trees by default and implements source-based trees for efficiency; it assumes that no hosts want the multicast traffic unless they specifically ask for it. It creates a shared distribution tree centered on a defined "rendezvous point" (RP) from which source traffic is relayed to the receivers. Senders first send the multicast data to the RP, which in turn sends the data down the shared tree to the receivers. Shared trees centered on an RP do not necessarily provide the shortest, most optimal path. In such cases PIM-SM provides a means to switch to more efficient source-specific trees. A data threshold rate is defined for toggling between trees. PIM-SM uses a Bootstrap Router (BSR), which advertises information to other multicast routers about the rendezvous point (RP). In a given network, a set of routers can be administratively enabled as candidate bootstrap routers. If it is not apparent which router should be the BSR, the candidates flood the domain with advertisements. The router with the highest priority is elected. If all the priorities are equal, then the candidate with the highest IP address becomes the BSR. PIM-SM is defined in RFC 4601. The following example describes how to configure and use PIM-SM. In this case, set the switch B,C,D as RP-candidate and BSR-cadidate. Switch B will become BSR because it has the highest priority. Switch D will become RP after RP election. 28-27 PIM v1.0, October 2009