diff --git a/src/main/java/net/floodlightcontroller/core/internal/Controller.java b/src/main/java/net/floodlightcontroller/core/internal/Controller.java
index 1a9a9c5..0d49c03 100644
--- a/src/main/java/net/floodlightcontroller/core/internal/Controller.java
+++ b/src/main/java/net/floodlightcontroller/core/internal/Controller.java
@@ -2215,9 +2215,11 @@
         this.roleChanger = new RoleChanger();
         
 		String conf = configParams.get("dbconf");
-		if (conf == null) {
+		if (conf == null || conf.isEmpty()) {
 			conf = "/tmp/cassandra.titan";
+			log.debug("did not get DB config setting using default {}", conf);
 		}
+		log.debug("setting DB config {}", conf);
 		this.swStore = new SwitchStorageImpl();
 		this.swStore.init(conf);
 		
diff --git a/src/main/java/net/floodlightcontroller/core/internal/SwitchStorageImpl.java b/src/main/java/net/floodlightcontroller/core/internal/SwitchStorageImpl.java
index a068586..17ab274 100644
--- a/src/main/java/net/floodlightcontroller/core/internal/SwitchStorageImpl.java
+++ b/src/main/java/net/floodlightcontroller/core/internal/SwitchStorageImpl.java
@@ -6,6 +6,7 @@
 import net.floodlightcontroller.core.INetMapTopologyObjects.ISwitchObject;
 import net.floodlightcontroller.core.ISwitchStorage;
 import net.onrc.onos.util.GraphDBConnection;
+import net.onrc.onos.util.GraphDBConnection.GenerateEvent;
 import net.onrc.onos.util.GraphDBConnection.Transaction;
 
 import org.openflow.protocol.OFPhysicalPort;
@@ -15,7 +16,7 @@
 import org.slf4j.LoggerFactory;
 
 public class SwitchStorageImpl implements ISwitchStorage {
-	public GraphDBConnection conn;
+	protected GraphDBConnection conn;
 	protected static Logger log = LoggerFactory.getLogger(SwitchStorageImpl.class);
 
 	@Override
@@ -177,11 +178,12 @@
             		log.info("SwitchStorage:deletePort dpid:{} port:{} found and deleted", dpid, port);
             		sw.removePort(p);
             		conn.utils().removePort(conn, p);
-            		conn.endTx(Transaction.COMMIT);
+            		conn.endTx(Transaction.COMMIT,GenerateEvent.TRUE);
             	}
             }
 		} catch (Exception e) {
              // TODO: handle exceptions
+			e.printStackTrace();
 			conn.endTx(Transaction.ROLLBACK);
 			log.info("SwitchStorage:deletePort dpid:{} port:{} failed", dpid, port);
 		}	
diff --git a/src/main/java/net/floodlightcontroller/core/internal/TopoSwitchServiceImpl.java b/src/main/java/net/floodlightcontroller/core/internal/TopoSwitchServiceImpl.java
index b3c31ec..9f63fd7 100644
--- a/src/main/java/net/floodlightcontroller/core/internal/TopoSwitchServiceImpl.java
+++ b/src/main/java/net/floodlightcontroller/core/internal/TopoSwitchServiceImpl.java
@@ -28,21 +28,21 @@
 	@Override
 	public Iterable<ISwitchObject> getActiveSwitches() {
 		// TODO Auto-generated method stub
-		conn = GraphDBConnection.getInstance("");
+		conn = GraphDBConnection.getInstance("/tmp/cassandra.titan");
 		return conn.utils().getActiveSwitches(conn);
 	}
 
 	@Override
 	public Iterable<ISwitchObject> getAllSwitches() {
 		// TODO Auto-generated method stub
-		conn = GraphDBConnection.getInstance("");
+		conn = GraphDBConnection.getInstance("/tmp/cassandra.titan");
 		return conn.utils().getAllSwitches(conn);
 	}
 
 	@Override
 	public Iterable<ISwitchObject> getInactiveSwitches() {
 		// TODO Auto-generated method stub
-		conn = GraphDBConnection.getInstance("");
+		conn = GraphDBConnection.getInstance("/tmp/cassandra.titan");
 		return conn.utils().getInactiveSwitches(conn);
 	}
 
diff --git a/src/main/java/net/floodlightcontroller/linkdiscovery/internal/LinkStorageImpl.java b/src/main/java/net/floodlightcontroller/linkdiscovery/internal/LinkStorageImpl.java
index 176a1a0..33ae22a 100644
--- a/src/main/java/net/floodlightcontroller/linkdiscovery/internal/LinkStorageImpl.java
+++ b/src/main/java/net/floodlightcontroller/linkdiscovery/internal/LinkStorageImpl.java
@@ -5,12 +5,16 @@
 import java.util.List;
 import java.util.Set;
 
+import net.floodlightcontroller.core.INetMapTopologyObjects.IPortObject;
 import net.floodlightcontroller.core.INetMapTopologyObjects.ISwitchObject;
 import net.floodlightcontroller.core.INetMapTopologyService.ITopoSwitchService;
 import net.floodlightcontroller.core.internal.TopoSwitchServiceImpl;
 import net.floodlightcontroller.linkdiscovery.ILinkStorage;
 import net.floodlightcontroller.linkdiscovery.LinkInfo;
 import net.floodlightcontroller.routing.Link;
+import net.onrc.onos.util.GraphDBConnection;
+import net.onrc.onos.util.GraphDBConnection.GenerateEvent;
+import net.onrc.onos.util.GraphDBConnection.Transaction;
 
 import org.openflow.util.HexString;
 import org.slf4j.Logger;
@@ -23,6 +27,8 @@
 import com.tinkerpop.blueprints.TransactionalGraph.Conclusion;
 import com.tinkerpop.blueprints.Vertex;
 import com.tinkerpop.blueprints.Edge;
+import com.tinkerpop.blueprints.util.wrappers.event.EventGraph;
+import com.tinkerpop.blueprints.util.wrappers.event.EventTransactionalGraph;
 import com.tinkerpop.gremlin.java.GremlinPipeline;
 import com.tinkerpop.pipes.PipeFunction;
 import com.tinkerpop.pipes.transform.PathPipe;
@@ -128,7 +134,8 @@
 
 	@Override
 	public void deleteLink(Link lt) {
-		Vertex vportSrc = null, vportDst = null;
+		GraphDBConnection conn = GraphDBConnection.getInstance("");
+		IPortObject vportSrc = null, vportDst = null;
 		int count = 0;
 		
 		log.debug("deleteLink(): {}", lt);
@@ -137,29 +144,33 @@
             // get source port vertex
          	String dpid = HexString.toHexString(lt.getSrc());
          	short port = lt.getSrcPort();
-         	vportSrc = getPortVertex(dpid, port);
+         	vportSrc = conn.utils().searchPort(conn, dpid, port);
             
             // get dst port vertex
          	dpid = HexString.toHexString(lt.getDst());
          	port = lt.getDstPort();
-         	vportDst = getPortVertex(dpid, port);
+         	vportDst = conn.utils().searchPort(conn, dpid, port);
+     		// FIXME: This needs to remove all edges
+         	// FIXME: Events will only be generated on singleton graph object (GraphDBConnection)
          	
          	if (vportSrc != null && vportDst != null) {
-         		for (Edge e : vportSrc.getEdges(Direction.OUT)) {
+
+   /*      		for (Edge e : vportSrc.asVertex().getEdges(Direction.OUT)) {
          			log.debug("deleteLink(): {} in {} out {}", 
          					new Object[]{e.getLabel(), e.getVertex(Direction.IN), e.getVertex(Direction.OUT)});
          			if (e.getLabel().equals("link") && e.getVertex(Direction.IN).equals(vportDst)) {
          				graph.removeEdge(e);
          				count++;
          			}
-         		}
-        		graph.stopTransaction(Conclusion.SUCCESS);
-            	log.debug("deleteLink(): deleted {} edges {} src {} dst {}", new Object[]{
-            			count, lt, vportSrc, vportDst});
+         		}*/
+         		vportSrc.removeLink(vportDst);
+        		conn.endTx(Transaction.COMMIT, GenerateEvent.TRUE);
+            	log.debug("deleteLink(): deleted edges src {} dst {}", new Object[]{
+            			lt, vportSrc, vportDst});
             	
             } else {
             	log.error("deleteLink(): failed invalid vertices {} src {} dst {}", new Object[]{lt, vportSrc, vportDst});
-            	graph.stopTransaction(Conclusion.FAILURE);
+            	conn.endTx(Transaction.ROLLBACK);
             }
          	
         } catch (TitanException e) {