I have a multicast network running Anycast. I am trying to test the configuration using "igmp join-group x.x.x.x" on the two loopback interfaces of RP routers. MSDP is working fine and I am also getting ping response to group address from both routers when I send ping from another router in the domain.
The problem is that after getting successfull response ping packets starts dropping. The interface goes in Pruned state. It happens when I do failover testing by shutting interface on one RP router as well as I have seen this happening when both routers are up.
Is this anormal behaviour of "igmp joing-group" or does it indicate an issue with config? I have not found out any relevant document.
Would appreciate some help !!