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I am trying to understand multi DC setup for cassandra. As I understand, in
this setup,  replicas exists in same cluster ring, but physically nodes are
distributed across DCs. Is this correct?
I have two different cluster rings in two DCs, and want to replicate data
bidirectionally. They both have same keyspace. They take  data traffic from
different sources, but we want to make sure, data exists in both the rings.
What could be the way to achieve this?

Thanks,
L.