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Multicast routing without knowing source subnet

Hi,

I have receiver on Z side which is in my control and source on A side of the network, to which I dont  have access.

I am getting routes using eBGP, now here is the issue - 

I know the RP address and mcast groups A side is publishing but they are not providing me source address/subnet of the publishers. we have access list at our end to allow only required subnet from all received-routes. So as you can imagine, SPT is going through default route (as ebgp routes are not filtered out) and it never reach to source and I am not getting any data, How can I force multicast traffic to come through RP (which is of course in A side network but I have ip details) or force group to use particular path for the mcast traffic!! (in other words, force receiver hop to send join to RP without using unicast for S from (S,G))

Let me know if my question is not clear enough.

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Anyone!!

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