Auto RP
--> Auto RP is a method used by PIM routers to dynamically learn RP information in the multicast network.
--> Cisco Proprietary Protocol.
--> Auto RP uses two multicast address 224.0.1.39 & 224.0.1.40 for dynamically learning RP information.
--> Routers that want to become RP should be configured as RP Candidate.
--> Once the router is configured as RP candidate then it will send RP Announcement message in the multicast network (224.0.1.39).
--> Routers which are configured as Mapping Agent only understands RP Announcement messages.
--> Mapping Agent is responsible for selecting RP for a particular group when it receives RP Announcement messages from more than one RP Candidate.
--> Mapping Agent then sends RP discovery message to all PIM routers so that all the routers get to know Rendezvous Point information in the multicast network.
--> RP Candidates with highest IP Address is elected as Rendezvous Point.
--> In order Auto RP to work, PIM router interfaces must be either configured with PIM Sparse Dense Mode or PIM auto RP listener.
--> It is possible to configure one router as RP Candidate and Mapping Agent.
--> By Default Mapping Agent accepts RP Announcement from any router. If we want to receive RP Announcements only from Particular routers then we need to use Auto RP Filters.
--> It is recommended to configure Sink RP or RP of Last Resort when we are using Auto RP in the multicast network.
--> A Sink RP is static RP which is configured to prevent the multicast traffic from unknown multicast groups.
Md.Kareem
CCIE # 54759
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