diff --git a/apps/k8s-networking/api/src/main/java/org/onosproject/k8snetworking/api/Constants.java b/apps/k8s-networking/api/src/main/java/org/onosproject/k8snetworking/api/Constants.java
index aefc940..a47f295 100644
--- a/apps/k8s-networking/api/src/main/java/org/onosproject/k8snetworking/api/Constants.java
+++ b/apps/k8s-networking/api/src/main/java/org/onosproject/k8snetworking/api/Constants.java
@@ -15,8 +15,10 @@
  */
 package org.onosproject.k8snetworking.api;
 
+import org.onlab.packet.MacAddress;
+
 /**
- * Provides constants used in OpenStackSwitching.
+ * Provides constants used in kubernetes network switching and routing.
  */
 public final class Constants {
 
@@ -24,4 +26,61 @@
     }
 
     public static final String K8S_NETWORKING_APP_ID = "org.onosproject.k8snetworking";
+
+    public static final String ARP_BROADCAST_MODE = "broadcast";
+    public static final String ARP_PROXY_MODE = "proxy";
+
+    public static final String DEFAULT_GATEWAY_MAC_STR = "fe:00:00:00:00:02";
+    public static final MacAddress DEFAULT_GATEWAY_MAC =
+                        MacAddress.valueOf(DEFAULT_GATEWAY_MAC_STR);
+
+    public static final String ANNOTATION_NETWORK_ID = "networkId";
+    public static final String ANNOTATION_PORT_ID = "portId";
+    public static final String ANNOTATION_CREATE_TIME = "createTime";
+    public static final String ANNOTATION_SEGMENT_ID = "segId";
+
+    // flow priority
+    public static final int PRIORITY_SNAT_RULE = 26000;
+    public static final int PRIORITY_DHCP_RULE = 42000;
+    public static final int PRIORITY_ADMIN_RULE = 32000;
+    public static final int PRIORITY_ACL_RULE = 31000;
+    public static final int PRIORITY_ACL_INGRESS_RULE = 30000;
+    public static final int PRIORITY_CT_HOOK_RULE = 30500;
+    public static final int PRIORITY_CT_RULE = 32000;
+    public static final int PRIORITY_CT_DROP_RULE = 32500;
+    public static final int PRIORITY_ARP_GATEWAY_RULE = 41000;
+    public static final int PRIORITY_ARP_SUBNET_RULE = 40000;
+    public static final int PRIORITY_ARP_CONTROL_RULE = 40000;
+    public static final int PRIORITY_ARP_REPLY_RULE = 40000;
+    public static final int PRIORITY_ARP_REQUEST_RULE = 40000;
+    public static final int PRIORITY_ARP_FLOOD_RULE = 39000;
+    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;
+    public static final int VTAP_INBOUND_TABLE = 1;
+    public static final int VTAP_INBOUND_MIRROR_TABLE = 2;
+    public static final int STAT_FLAT_OUTBOUND_TABLE = 10;
+    public static final int VTAP_FLAT_OUTBOUND_TABLE = 11;
+    public static final int VTAP_FLAT_OUTBOUND_MIRROR_TABLE = 12;
+    public static final int DHCP_TABLE = 5;
+    public static final int VTAG_TABLE = 30;
+    public static final int ARP_TABLE = 35;
+    public static final int ACL_EGRESS_TABLE = 40;
+    public static final int ACL_INGRESS_TABLE = 44;
+    public static final int CT_TABLE = 45;
+    public static final int ACL_RECIRC_TABLE = 43;
+    public static final int JUMP_TABLE = 50;
+    public static final int ROUTING_TABLE = 60;
+    public static final int STAT_OUTBOUND_TABLE = 70;
+    public static final int VTAP_OUTBOUND_TABLE = 71;
+    public static final int VTAP_OUTBOUND_MIRROR_TABLE = 72;
+    public static final int FORWARDING_TABLE = 80;
+    public static final int ERROR_TABLE = 100;
+
+    // group table index
+    public static final int VTAP_INBOUND_GROUP_TABLE = 1;
+    public static final int VTAP_FLAT_OUTBOUND_GROUP_TABLE = 2;
+    public static final int VTAP_OUTBOUND_GROUP_TABLE = 3;
 }
diff --git a/apps/k8s-networking/api/src/main/java/org/onosproject/k8snetworking/api/K8sFlowRuleService.java b/apps/k8s-networking/api/src/main/java/org/onosproject/k8snetworking/api/K8sFlowRuleService.java
new file mode 100644
index 0000000..8069adf
--- /dev/null
+++ b/apps/k8s-networking/api/src/main/java/org/onosproject/k8snetworking/api/K8sFlowRuleService.java
@@ -0,0 +1,59 @@
+/*
+ * Copyright 2019-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.k8snetworking.api;
+
+import org.onosproject.core.ApplicationId;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.flow.TrafficSelector;
+import org.onosproject.net.flow.TrafficTreatment;
+
+/**
+ * Service for setting flow rules.
+ */
+public interface K8sFlowRuleService {
+
+    /**
+     * Configure the flow rule.
+     *
+     * @param appId         application ID
+     * @param deviceId      device ID
+     * @param selector      traffic selector used for match header fields
+     * @param treatment     traffic treatment for take actions for matched packets
+     * @param priority      rule priority
+     * @param tableType     table number to install flow rules
+     * @param install       true for rule addition, false for rule removal
+     */
+    void setRule(ApplicationId appId, DeviceId deviceId,
+                 TrafficSelector selector, TrafficTreatment treatment,
+                 int priority, int tableType, boolean install);
+
+    /**
+     * Installs table miss entry (drop rule) for the given flow table.
+     *
+     * @param deviceId      device ID
+     * @param table         table number
+     */
+    void setUpTableMissEntry(DeviceId deviceId, int table);
+
+    /**
+     * Installs a flow rule for transiting from table A to table B.
+     *
+     * @param deviceId      device ID
+     * @param fromTable     table number of table A
+     * @param toTable       table number of table B
+     */
+    void connectTables(DeviceId deviceId, int fromTable, int toTable);
+}