diff --git a/lib/cassandra/cluster/schema/replication_strategies/network_topology.rb b/lib/cassandra/cluster/schema/replication_strategies/network_topology.rb
index 93ae67902..cbcbde0b0 100644
--- a/lib/cassandra/cluster/schema/replication_strategies/network_topology.rb
+++ b/lib/cassandra/cluster/schema/replication_strategies/network_topology.rb
@@ -46,9 +46,11 @@ def replication_map(token_hosts, token_ring, replication_options)
                 datacenter = host.datacenter
                 next if datacenter.nil?
 
-                factor = Integer(replication_options[datacenter])
+                factor = replication_options[datacenter]
                 next unless factor
 
+                factor = Integer(factor) rescue next
+
                 replicas_in_datacenter = all_replicas[datacenter] ||= ::Set.new
                 next if replicas_in_datacenter.size >= factor
 
diff --git a/spec/cassandra/cluster/schema/replication_strategies/network_topology_spec.rb b/spec/cassandra/cluster/schema/replication_strategies/network_topology_spec.rb
index 4c4cb3083..82cdbc623 100644
--- a/spec/cassandra/cluster/schema/replication_strategies/network_topology_spec.rb
+++ b/spec/cassandra/cluster/schema/replication_strategies/network_topology_spec.rb
@@ -91,6 +91,27 @@ module ReplicationStrategies
                 ])
               end
             end
+
+            context('with datacenters missing replication factor') do
+              let(:replication_options) {
+                {
+                  'dc1' => '2',
+                  'dc2' => '2'
+                }
+              }
+
+              it 'skips those datacenters in replication map' do
+                replication_map = subject.replication_map(token_hosts, token_ring, replication_options)
+                expect(replication_map[token_ring[0]].map do |host|
+                  [host.datacenter, host.rack]
+                end).to eq([
+                  ['dc1', 'rack1'],
+                  ['dc2', 'rack1'],
+                  ['dc1', 'rack2'],
+                  ['dc2', 'rack2'],
+                ])
+              end
+            end
           end
         end
       end