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 184.108.40.206 & 220.127.116.11 to be densed flooded.
As the RP announces 18.104.22.168 to the mapping agent and the mapping agent announces 22.214.171.124 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.