diff --git a/etc/l3_agent.ini b/etc/l3_agent.ini
index 7ad23531b9..5eb52ef321 100644
--- a/etc/l3_agent.ini
+++ b/etc/l3_agent.ini
@@ -41,3 +41,16 @@ root_helper = sudo
 # for a single agent in a Quantum deployment, and may be False for all agents
 # if all routers must have an external network gateway
 # handle_internal_only_routers = True
+
+# Name of bridge used for external network traffic. This should be set to
+# empty value for the linux bridge
+# external_network_bridge = br-ex
+
+# IP address used by Nova metadata server
+# metadata_ip =
+
+# TCP Port used by Nova metadata server
+# metadata_port = 8775
+
+# The time in seconds between state poll requests
+# polling_interval = 3