In PIM Sparse Mode, it is required that one router or more operate as a rendezvous point, or RP.
The RP is a single common root placed at a selected point of a shared distribution tree.
The RP can be configured statically or learned through a dynamic mechanism.
The PIM router can be configured to act as a rendezvous point statically or dynamically by configuring automatic rendezvous point or as a PIM bootstrap router.