PIM Sparse Mode

PIM Sparse Mode
PIM sparse mode uses shared distribution trees. It does not assume that any
routers want to receive the multicast, but instead waits to hear an explicit
message from them, joining the group. Then it adds branches to the tree to
reach the hosts behind those routers. PIM sparse mode uses RPs to connect
hosts and servers. After the connection is made, PIM switches over to a
source tree. Sparse mode is used when:
�¡ Pockets of users are widely dispersed around the network.
�¡ Multicast traffic is intermittent.