Some legacy PIM-SMv1 networks use the auto-RP protocol. Auto-RP is a Cisco proprietary protocol that provides equivalent functionality to the legacy platform supported PIM-SM RP and BSR. You can use the static RP feature to interoperate in this environment. For example, in a mixed-vendor network, you can use auto-RP among routers that support the protocol, while other routers use static RP. In such a network, ensure that the static RP configuration mimics the information that is dynamically distributed to guarantee that multicast traffic is delivered to all parts of the network.
In a mixed auto-RP and static RP network, ensure that the legacy platform does not serve as an RP because it does not support the auto-RP protocol. In this type of network, the RP must support the auto-RP protocol.