Cassandra implement in two different data-center

[Adeel Akbar]

Dear All,

I am going to implement Apache Cassandra in two different data-center 
with 2 nodes in each ring.  I also need to set replica 2 factor in same 
data center. Over the data center data should be replicates between both 
data center rings. Please help me or provide any document which help to 
implement this model.
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Thanks & Regards

*Adeel**Akbar*