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New Member

Mapping agents and RP Routers

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

3 REPLIES
Cisco Employee

Re: Mapping agents and RP Routers

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,

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
New Member

Re: Mapping agents and RP Routers

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) ?

Cisco Employee

Re: Mapping agents and RP Routers

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,

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
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