Multicast headache [ CCNP Level]

Dear all,

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I'm actually having a real headache trying to figure out how to handle this thing.

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I actually have multicast traffic going from a customer network (source) to one of my datacenter (receiver). I will shortly shut the actual datacenter and move to a new one. Therefore, the multicast traffic will go through the new datacenter equipments.

BUT

I first need to validate that the multicast traffic in the new datacenter at the same time without interfere the actual multicast traffic on the old line.

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All the more as I have PIM Sparse enabled, destinations are the same ( source and RP ) and I can only use 1 SPT (source path tree)...

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If you need diagram I can upload it,

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Any ideas ?

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Thanks in advance,