Use static RP to provide security, interoperability, and redundancy for PIM-SM multicast networks. Consider if the administrative ease derived from using dynamic RP assignment is worth the security risks involved. For example, if an unauthorized user connects a PIM-SM router that advertises itself as a candidate RP (C-RP), it can possibly take over new multicast streams that otherwise distribute through an authorized RP. If security is important, use static RP assignment.
You can use the static RP feature in a PIM environment with devices that run legacy PIM-SMv1 and Cisco Auto-RP. For faster convergence, you can also use static RP in a PIM-SMv2 environment. If you configure static RP with PIM-SMv2, the BSR is not active.