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Cisco mapping agent / RP selection algorithm with overlapping groups

Sam Brynes
Beginner
Beginner

Let's say we have two routers configured as RP candidates for auto-RP:

 

R1 - "advertising" its loopback0 interface IP address 1.1.1.1 as the RP for these groups:

239.1.1.1/32
239.2.2.2/32
239.3.0.0/24
239.4.0.0/16

 

R2 - "advertising" its loopback0 interface IP address 2.2.2.2 as the RP for these groups:

239.1.1.1/32
239.2.2.0/24
239.3.3.3/32
239.5.0.0/16

 

Let's assume that the mapping agent hears all of these advertisements. What RP and group information will the RP-discovery packets contain?

 

Furthermore, how will Cisco routers receiving these RP-discovery packets choose an RP based on a given multicast group? Assume that all auto-RP discovery packets are forwarded to all routers correctly (ip pim dense mode with ip pim autorp listener command applied).

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