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;
 }