diff --git a/apps/openstacknetworking/api/src/main/java/org/onosproject/openstacknetworking/api/Constants.java b/apps/openstacknetworking/api/src/main/java/org/onosproject/openstacknetworking/api/Constants.java
index 532aa90..d890e5c 100644
--- a/apps/openstacknetworking/api/src/main/java/org/onosproject/openstacknetworking/api/Constants.java
+++ b/apps/openstacknetworking/api/src/main/java/org/onosproject/openstacknetworking/api/Constants.java
@@ -73,6 +73,7 @@
     public static final int PRIORITY_ARP_REPLY_RULE = 40000;
     public static final int PRIORITY_ARP_REQUEST_RULE = 40000;
     public static final int PRIORITY_FORCED_ACL_RULE = 50000;
+    public static final int PRIORITY_ICMP_PROBE_RULE = 50000;
 
     // flow table index
     public static final int STAT_INBOUND_TABLE = 0;
diff --git a/apps/openstacknetworking/api/src/main/java/org/onosproject/openstacknetworking/api/OpenstackNetworkService.java b/apps/openstacknetworking/api/src/main/java/org/onosproject/openstacknetworking/api/OpenstackNetworkService.java
index 864b4a4..71fc440 100644
--- a/apps/openstacknetworking/api/src/main/java/org/onosproject/openstacknetworking/api/OpenstackNetworkService.java
+++ b/apps/openstacknetworking/api/src/main/java/org/onosproject/openstacknetworking/api/OpenstackNetworkService.java
@@ -163,5 +163,11 @@
      */
     String gatewayIp(String portId);
 
-
+    /**
+     * Returns network segment ID with supplied network ID.
+     *
+     * @param netId openstack network ID
+     * @return network segment ID
+     */
+    String segmentId(String netId);
 }