Mapping agents and RP Routers

[zillah2004]

Is it mandotary that RP router different form RP mapping agent router ? (i.e is there any that same router can act as RP and mapping agent as well ?)

RouterAgent#(config)ip pim send-rp-discovery scope ttl

[Harold Ritter]

It is pretty common actually to have the RP router also acting as a mapping agent. If you want redundancy, you can have two RPs both also acting as mapping agent.

Hope it helps. Please rate if it does,

[zillah2004]

As you know that Auto-RP defines two roles in the

PIM domain, the candidate-RP and the mapping agent. The candidate RP uses multicast messages to dvertise itself to the mapping agent.

The mapping agent advertises itself through multicast

messages, and is responsible for group to RP mappings.

Now if RP router also acting as a mapping agent, does RP still use multicast messages to advertise itself to the mapping agent (i.e in the case it will advertise messages to itself) ?

[Harold Ritter]

Although the advertisement of the RP announcement to itself (as a mapping agent) is internal, the router still multicasts RP announcement messages on multicast address 224.0.1.39 out of all interfaces configured in sparse-dense mode since there could other mapping agents out there.

Let me know if I answered your question,