Anycast RP is used in multicast scenarios to load balance the RP messages. With the deployment of anycast RP have to configure the same ip address on all those routers which will participate as RP. After that MSDP peering is required so that source active messages can be exchanged easily. RP announcements can be send by implementing autp-rp or static RP. If your cloud is havinf all cisco routers then auto-rp is the best else go with BSR mode.