multicast over NBMA

From: mani poopal (mani_ccie@yahoo.com)
Date: Sun Mar 20 2005 - 00:09:38 GMT-3

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Hi Guys,
 
Assume you have multicast over frame relay NBMA network where R1 is hub and R2 and R3 are spokes. I joined the R2 e0 to multicast group 224.24.24.24(-if)#ip igmp join-group 224.24.24.24).
My Question: I thought you cannot ping this address from other spoke(R3) becase R1 hub will not send and receive multicast over same interface. My assumption is we need GRE tunnel interface between both spokes to overcome this situation, but to my surprise I was able to ping the 224.24.24.24 from other spoke, R3. Any explanation is appreciated.
 
thanks
 
Mani

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