diff --git a/templates/default/l3_agent.ini.erb b/templates/default/l3_agent.ini.erb
index f443dc0..a25b472 100644
--- a/templates/default/l3_agent.ini.erb
+++ b/templates/default/l3_agent.ini.erb
@@ -1,6 +1,10 @@
 [DEFAULT]
 external_network_bridge = <%= @quantum_external_bridge %>
 
+# Once networks are created please update the environment variables quantum[l3][router_id], quantum[l3][gateway_external_net_id]
+router_id = <%= @l3_router_id %>
+gateway_external_network_id = <%= @l3_gateway_net_id %>
+
 metadata_ip = <%= @nova_metadata_ip %>
 metadata_port = 8775