title: Configuring cassandra-rackdc and cassandra-topology
body: <p>I am configuring 6 nodes Cassandra cluster on AWS EC2,3 nodes in region and 3nodes in other region:</p>
  <p>eu-central-1</p>
  <ul>
  <li>node0   cass-db-0   10.10.37.79   eu-central-1a</li>
  <li>node1   cass-db-1   10.10.38.229  eu-central-1b</li>
  <li>node2   cass-db-2   10.10.36.76   eu-central-1a</li>
  </ul>
  <p>eu-west-1</p>
  <ul>
  <li>node3   cass-db-0   10.10.37.80   eu-west-1a</li>
  <li>node4   cass-db-1   10.10.39.177  eu-west-1b</li>
  <li>node5   cass-db-2   10.10.37.231  eu-west-1a</li>
  </ul>
  <p>I have completed the local configuration in cassandra.yaml.</p>
  <p>Now I need to configure cassandra-rackdc.properties &amp; cassandra-topology.properties but I don't understand the network topology.</p>
  <p>Please Advise.</p>
  <p>Thanks</p>