addPort fails occassionally...do better exception handling
diff --git a/src/main/java/net/floodlightcontroller/core/INetMapTopologyObjects.java b/src/main/java/net/floodlightcontroller/core/INetMapTopologyObjects.java
index 4f11c6c..e29e8e1 100644
--- a/src/main/java/net/floodlightcontroller/core/INetMapTopologyObjects.java
+++ b/src/main/java/net/floodlightcontroller/core/INetMapTopologyObjects.java
@@ -46,7 +46,7 @@
 		public Iterable<IPortObject> getPorts();
 		
 		@JsonIgnore
-		@GremlinGroovy("_().out('on').has('number',portnum)")
+		@GremlinGroovy("_().out('on').has('number',port_num)")
 		public IPortObject getPort(final short port_num);
 		
 		@Adjacency(label="on")
@@ -109,9 +109,16 @@
 		@Incidence(label="outport",direction = Direction.IN)
 		public Iterable<IFlowEntry> getOutFlowEntries();
 		
+		@JsonIgnore
+		@Adjacency(label="link")
+		public Iterable<IPortObject> getLinkedPorts();
+		
 		@Adjacency(label="link")
 		public void removeLink(final IPortObject dest_port);
 		
+		@Adjacency(label="link")
+		public void setLinkPort(final IPortObject dest_port);			
+		
 //		@JsonIgnore
 //		@Adjacency(label="link")
 //		public Iterable<ILinkObject> getLinks();