Configuring a Static Rendezvous PointThe rendezvous point (RP) is a PIM-enabled interface on a router that acts as the root a group-specific tree; every group must have an RP.• Identify an RP by the IP address of a PIM-enabled or Loopback interface.ip pim rp-addressExample of Viewing an RP on a Loopback InterfaceDell#sh run int loop0!interface Loopback 0ip address 1.1.1.1/32ip pim sparse-modeno shutdownDell#sh run pim!ip pim rp-address 1.1.1.1 group-address 224.0.0.0/4Overriding Bootstrap Router UpdatesPIM-SM routers must know the address of the RP for each group for which they have (*,G) entry.This address is obtained automatically through the bootstrap router (BSR) mechanism or a static RP configuration.Use the following command if you have configured a static RP for a group. If you do not use the override option with the followingcommand, the RPs advertised in the BSR updates take precedence over any statically configured RPs.• Use the override option to override bootstrap router updates with your static RP configuration.ip pim rp-addressExamples of Viewing the Rendezvous Point (Multicast Group) InformationTo display the assigned RP for a group, use the show ip pim rp command from EXEC privilege mode.Dell#show ip pim rpGroup RP225.0.1.40 165.87.50.5226.1.1.1 165.87.50.5To display the assigned RP for a group range (group-to-RP mapping), use the show ip pim rp mapping command in EXEC privilegemode.Dell#show ip pim rp mappingPIM Group-to-RP MappingsGroup(s): 224.0.0.0/4, StaticRP: 165.87.50.5, v2Configuring a Designated RouterMultiple PIM-SM routers might be connected to a single local area network (LAN) segment. One of these routers is elected to act onbehalf of directly connected hosts. This router is the designated router (DR).The DR is elected using hello messages. Each PIM router learns about its neighbors by periodically sending a hello message out of eachPIM-enabled interface. Hello messages contain the IP address of the interface out of which it is sent and a DR priority value. The routerwith the greatest priority value is the DR. If the priority value is the same for two routers, then the router with the greatest IP address isthe DR. By default, the DR priority value is 192, so the IP address determines the DR.• Assign a DR priority value.INTERFACE modeip pim dr-priority priority-value686 PIM Sparse-Mode (PIM-SM)
