diff --git a/bgp/ctl/src/main/java/org/onosproject/bgp/controller/impl/AdjRibIn.java b/bgp/ctl/src/main/java/org/onosproject/bgp/controller/impl/AdjRibIn.java
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+++ b/bgp/ctl/src/main/java/org/onosproject/bgp/controller/impl/AdjRibIn.java
@@ -0,0 +1,132 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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.bgp.controller.impl;
+
+import java.util.Map;
+import java.util.TreeMap;
+
+import org.onosproject.bgpio.protocol.BGPLSNlri;
+import org.onosproject.bgpio.protocol.linkstate.BGPLinkLSIdentifier;
+import org.onosproject.bgpio.protocol.linkstate.BgpLinkLsNlriVer4;
+import org.onosproject.bgpio.protocol.linkstate.BGPNodeLSIdentifier;
+import org.onosproject.bgpio.protocol.linkstate.BGPNodeLSNlriVer4;
+import org.onosproject.bgpio.protocol.linkstate.BGPPrefixIPv4LSNlriVer4;
+import org.onosproject.bgpio.protocol.linkstate.BGPPrefixLSIdentifier;
+import org.onosproject.bgpio.protocol.linkstate.PathAttrNlriDetails;
+
+import com.google.common.base.MoreObjects;
+
+/**
+ * Implementation of Adj-RIB-In for each peer.
+ */
+public class AdjRibIn {
+    private Map<BGPNodeLSIdentifier, PathAttrNlriDetails> nodeTree = new TreeMap<>();
+    private Map<BGPLinkLSIdentifier, PathAttrNlriDetails> linkTree = new TreeMap<>();
+    private Map<BGPPrefixLSIdentifier, PathAttrNlriDetails> prefixTree = new TreeMap<>();
+
+    /**
+     * Returns the adjacency node.
+     *
+     * @return node adjacency RIB node
+     */
+    public Map<BGPNodeLSIdentifier, PathAttrNlriDetails> nodeTree() {
+        return nodeTree;
+    }
+
+    /**
+     * Returns the adjacency link.
+     *
+     * @return link adjacency RIB node
+     */
+    public Map<BGPLinkLSIdentifier, PathAttrNlriDetails> linkTree() {
+        return linkTree;
+    }
+
+    /**
+     * Returns the adjacency prefix.
+     *
+     * @return prefix adjacency RIB node
+     */
+    public Map<BGPPrefixLSIdentifier, PathAttrNlriDetails> prefixTree() {
+        return prefixTree;
+    }
+
+    /**
+     * Update nlri identifier into the tree if nlri identifier exists in tree otherwise add this to the tree.
+     *
+     * @param nlri NLRI Info
+     * @param details has pathattribute , protocolID and identifier
+     */
+    public void add(BGPLSNlri nlri, PathAttrNlriDetails details) {
+        if (nlri instanceof BGPNodeLSNlriVer4) {
+            BGPNodeLSIdentifier nodeLSIdentifier = ((BGPNodeLSNlriVer4) nlri).getLocalNodeDescriptors();
+            if (nodeTree.containsKey(nodeLSIdentifier)) {
+                nodeTree.replace(nodeLSIdentifier, details);
+            } else {
+                nodeTree.put(nodeLSIdentifier, details);
+            }
+        } else if (nlri instanceof BgpLinkLsNlriVer4) {
+            BGPLinkLSIdentifier linkLSIdentifier = ((BgpLinkLsNlriVer4) nlri).getLinkIdentifier();
+            if (linkTree.containsKey(linkLSIdentifier)) {
+                linkTree.replace(linkLSIdentifier, details);
+            } else {
+                linkTree.put(linkLSIdentifier, details);
+            }
+        } else if (nlri instanceof BGPPrefixIPv4LSNlriVer4) {
+            BGPPrefixLSIdentifier prefixIdentifier = ((BGPPrefixIPv4LSNlriVer4) nlri).getPrefixIdentifier();
+            if (prefixTree.containsKey(prefixIdentifier)) {
+                prefixTree.replace(prefixIdentifier, details);
+            } else {
+                prefixTree.put(prefixIdentifier, details);
+            }
+        }
+    }
+
+    /**
+     * Removes nlri identifier if it exists in the adjacency tree.
+     *
+     * @param nlri NLRI Info
+     */
+    public void remove(BGPLSNlri nlri) {
+        if (nlri instanceof BGPNodeLSNlriVer4) {
+            BGPNodeLSIdentifier nodeLSIdentifier = ((BGPNodeLSNlriVer4) nlri).getLocalNodeDescriptors();
+            if (nodeTree.containsKey(nodeLSIdentifier)) {
+                nodeTree.remove(nodeLSIdentifier);
+            }
+        } else if (nlri instanceof BgpLinkLsNlriVer4) {
+            BGPLinkLSIdentifier linkLSIdentifier = ((BgpLinkLsNlriVer4) nlri).getLinkIdentifier();
+            if (linkTree.containsKey(linkLSIdentifier)) {
+                linkTree.remove(linkLSIdentifier);
+            }
+        } else if (nlri instanceof BGPPrefixIPv4LSNlriVer4) {
+            BGPPrefixLSIdentifier prefixIdentifier = ((BGPPrefixIPv4LSNlriVer4) nlri).getPrefixIdentifier();
+            if (prefixTree.containsKey(prefixIdentifier)) {
+                prefixTree.remove(prefixIdentifier);
+            }
+        }
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .omitNullValues()
+                .add("nodeTree", nodeTree)
+                .add("linkTree", linkTree)
+                .add("prefixTree", prefixTree)
+                .toString();
+    }
+}
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