You can configure an RP candidate to send periodic candidate-RP-advertisement messages to the BSR and to process JP or register messages for the advertised group prefix, when it is elected as an RP.
Use RP-candidate RP-address to configure the address of the interface that is advertised as a candidate-RP. In addition, you can specify the group address for which the entry that contains routing information and the group mask, which provides the group prefix for the entry that contains information about the RP.