A Protocol Independent Multicast (PIM) network will converge as quickly as unicast routingconverges after the failure or addition of an Anycast rendezvous point (RP). Convergence does not require a certain period of time, it does not require the presence or absence of multicast sources or receivers, and it does not require that an administrator manually reconfigure the RP.
Anycast RP enables multiple RPs to provide redundancy and load-sharing capabilities. Eachmulticast receiver will use the closest RP. Each of the Anycast RPs must be configured as Multicast Source Discovery Protocol (MSDP) peers of one another because they use MSDP to share information about multicast sources. All the Anycast RPs must have the same IP address on a loopback interface. Downstream routers must be configured with the shared loopback address of the Anycast RPs, either statically by using the ip pim rp-address command or dynamically by using AutoRP or BootStrap Router (BSR).