please explain briefly what " ip pim autorp listener" does, and where it can be applied.
This command normally used when PiM Dense mode is not configured.
The IP Pim autorp listener allows the Group 22.214.171.124 & 126.96.36.199 to be densed flooded.
As the RP announces 188.8.131.52 to the mapping agent and the mapping agent announces 184.108.40.206 to all routers part of the group.
where it can be applied:
It can be applied when Dense mode is not configured, for example if you have Sparse-mode Multicast Network, and you need not to statically define your RP or use Autorp.