+ List<String> getAllPhysicalInterfaceNames(Node node);
+
+ /*
+ * Return br-ex interface configured in the bridge_mappings.
+ * Return null if br-ex is not configured in bridge_mappings.
+ * @param node the {@link Node} to query
+ * @param externalNetwork
+ * @return the interface as a string like eth3 given bridge_mappings=br-ex:eth3
+ */
+ String getExternalInterfaceName (Node node, String externalNetwork);
+
+}