Notes:
Autorp listener is used in Sparse mode to ensure that the RP can talk to the Mapping Agent 224.0.1.39 and that the Mapping Agent can talk to the rest of the routers 224.0.1.40, which is accomplished by allowing these 2 groups to speak in Dense mode.
The Lab asks that we do not allow Dense mode fallback however since this is strictly Sparse mode, there is no possibility of this falling back to Dense mode. "no ip pim dm-fallback" should be used in Sparse-Dense mode, to stop the routers from speaking in Dense Mode if RP info is lost, since RPs are not used in Dense mode.
Configs:
No configs necessary as the only difference between Sparse mode and Sparse-Dense mode is "ip pim autorp listener"
