diff --git a/src/emuvim/api/rest/monitor.py b/src/emuvim/api/rest/monitor.py
index 45d9541..8de0379 100755
--- a/src/emuvim/api/rest/monitor.py
+++ b/src/emuvim/api/rest/monitor.py
@@ -53,20 +53,26 @@
     """
     global net
 
-    def put(self, vnf_name, vnf_interface=None, metric='tx_packets'):
+    def put(self, vnf_name, vnf_interface=None, metric='tx_packets', cookie=None):
         logging.debug("REST CALL: start monitor VNF interface")
         try:
-            c = net.monitor_agent.setup_metric(vnf_name, vnf_interface, metric)
+            if cookie:
+                c = net.monitor_agent.setup_flow(vnf_name, vnf_interface, metric, cookie)
+            else:
+                c = net.monitor_agent.setup_metric(vnf_name, vnf_interface, metric)
             # return monitor message response
             return  str(c), 200
         except Exception as ex:
             logging.exception("API error.")
             return ex.message, 500
 
-    def delete(self, vnf_name, vnf_interface=None, metric='tx_packets'):
+    def delete(self, vnf_name, vnf_interface=None, metric='tx_packets', cookie=None):
         logging.debug("REST CALL: stop monitor VNF interface")
         try:
-            c = net.monitor_agent.stop_metric(vnf_name, vnf_interface, metric)
+            if cookie:
+                c = net.monitor_agent.stop_flow(vnf_name, vnf_interface, metric, cookie)
+            else:
+                c = net.monitor_agent.stop_metric(vnf_name, vnf_interface, metric)
             # return monitor message response
             return str(c), 200
         except Exception as ex:
@@ -103,4 +109,100 @@
             return str(c), 200
         except Exception as ex:
             logging.exception("API error.")
+            return ex.message, 500
+
+class MonitorLinkAction(Resource):
+    """
+    Add or remove chains between VNFs. These chain links are implemented as flow entries in the networks' SDN switches.
+    :param vnf_src_name: VNF name of the source of the link
+    :param vnf_dst_name: VNF name of the destination of the link
+    :param vnf_src_interface: VNF interface name of the source of the link
+    :param vnf_dst_interface: VNF interface name of the destination of the link
+    :param weight: weight of the link (can be useful for routing calculations)
+    :param match: OpenFlow match format of the flow entry
+    :param bidirectional: boolean value if the link needs to be implemented from src to dst and back
+    :param cookie: cookie value, identifier of the flow entry to be installed.
+    :param priority: integer indicating the priority of the flow entry
+    :param skip_vlan_tag: boolean to indicate whether a new vlan tag should be created for this chain
+    :param monitor: boolean to indicate whether a new vlan tag should be created for this chain
+    :param monitor_placement: 'tx'=place the monitoring flowrule at the beginning of the chain, 'rx'=place at the end of the chain
+    :param metric: tx_packet_rate, tx_byte_rate, rx_packet_rate, rx_byte_rate
+    :return: message string indicating if the chain action is succesful or not
+    """
+
+    # the global net is set from the topology file, and connected via connectDCNetwork function in rest_api_endpoint.py
+    global net
+
+    def put(self, vnf_src_name, vnf_dst_name):
+        logging.debug("REST CALL: monitor link flow add")
+
+        try:
+            command = 'add-flow'
+            return self._MonitorLinkAction(vnf_src_name, vnf_dst_name, command=command)
+        except Exception as ex:
+            logging.exception("API error.")
+            return ex.message, 500
+
+    def delete(self, vnf_src_name, vnf_dst_name):
+        logging.debug("REST CALL: monitor link flow remove")
+
+        try:
+            command = 'del-flows'
+            return self._MonitorLinkAction(vnf_src_name, vnf_dst_name, command=command)
+        except Exception as ex:
+            logging.exception("API error.")
+            return ex.message, 500
+
+    def _MonitorLinkAction(self, vnf_src_name, vnf_dst_name, command=None):
+        # call DCNetwork method, not really datacenter specific API for now...
+        # no check if vnfs are really connected to this datacenter...
+        try:
+            # check if json data is a dict
+            data = request.json
+            if data is None:
+                data = {}
+            elif type(data) is not dict:
+                data = json.loads(request.json)
+
+            vnf_src_interface = data.get("vnf_src_interface")
+            vnf_dst_interface = data.get("vnf_dst_interface")
+            weight = data.get("weight")
+            match = data.get("match")
+            bidirectional = data.get("bidirectional")
+            cookie = data.get("cookie")
+            priority = data.get("priority")
+            skip_vlan_tag = data.get("skip_vlan_tag")
+            monitor = data.get("monitor")
+            monitor_placement = data.get("monitor_placement")
+
+            #first install monitor flow
+            c1 = net.setChain(
+                vnf_src_name, vnf_dst_name,
+                vnf_src_interface=vnf_src_interface,
+                vnf_dst_interface=vnf_dst_interface,
+                cmd=command,
+                weight=weight,
+                match=match,
+                bidirectional=bidirectional,
+                cookie=cookie,
+                priority=priority,
+                skip_vlan_tag=skip_vlan_tag,
+                monitor=monitor,
+                monitor_placement=monitor_placement)
+
+            #then export monitor flow
+            metric = data.get("metric")
+            if 'rx' in monitor_placement:
+                vnf_name = vnf_dst_name
+                vnf_interface = vnf_dst_interface
+            elif 'tx' in monitor_placement:
+                vnf_name = vnf_src_name
+                vnf_interface = vnf_src_interface
+
+            c2 = net.monitor_agent.setup_flow(vnf_name, vnf_interface, metric, cookie)
+
+            # return setChain response
+            return (str(c1) + " " + str(c2)), 200
+        except Exception as ex:
+            logging.exception("API error.")
             return ex.message, 500
\ No newline at end of file
diff --git a/src/emuvim/api/rest/network.py b/src/emuvim/api/rest/network.py
index 5375943..88ea470 100755
--- a/src/emuvim/api/rest/network.py
+++ b/src/emuvim/api/rest/network.py
@@ -39,6 +39,7 @@
 
 logging.basicConfig(level=logging.INFO)
 
+# the global net is set from the topology file, and connected via connectDCNetwork function in rest_api_endpoint.py
 net = None
 
 
diff --git a/src/emuvim/api/rest/rest_api_endpoint.py b/src/emuvim/api/rest/rest_api_endpoint.py
index a065e16..7a0fc4f 100755
--- a/src/emuvim/api/rest/rest_api_endpoint.py
+++ b/src/emuvim/api/rest/rest_api_endpoint.py
@@ -39,7 +39,7 @@
 from network import NetworkAction
 
 import monitor
-from monitor import MonitorInterfaceAction, MonitorFlowAction
+from monitor import MonitorInterfaceAction, MonitorFlowAction, MonitorLinkAction
 
 logging.basicConfig(level=logging.INFO)
 
@@ -71,14 +71,18 @@
         self.api.add_resource(DatacenterStatus, "/restapi/datacenter/<dc_label>")
         self.api.add_resource(DatacenterList, "/restapi/datacenter")
 
-        self.api.add_resource(NetworkAction, "/restapi/network/<vnf_src_name>/<vnf_dst_name>", )
+        self.api.add_resource(NetworkAction,
+                              "/restapi/network/<vnf_src_name>/<vnf_dst_name>")
 
         self.api.add_resource(MonitorInterfaceAction,
-                              "/restapi/monitor/<vnf_name>/<metric>",
-                              "/restapi/monitor/<vnf_name>/<vnf_interface>/<metric>")
+                              "/restapi/monitor/vnf/<vnf_name>/<metric>",
+                              "/restapi/monitor/vnf/<vnf_name>/<vnf_interface>/<metric>",
+                              "/restapi/monitor/vnf/<vnf_name>/<vnf_interface>/<metric>/<cookie>")
         self.api.add_resource(MonitorFlowAction,
-                              "/restapi/flowmon/<vnf_name>/<metric>/<cookie>",
-                              "/restapi/flowmon/<vnf_name>/<vnf_interface>/<metric>/<cookie>")
+                              "/restapi/monitor/flow/<vnf_name>/<metric>/<cookie>",
+                              "/restapi/monitor/flow/<vnf_name>/<vnf_interface>/<metric>/<cookie>")
+        self.api.add_resource(MonitorLinkAction,
+                              "/restapi/monitor/link/<vnf_src_name>/<vnf_dst_name>")
 
         logging.debug("Created API endpoint %s(%s:%d)" % (self.__class__.__name__, self.ip, self.port))
 
diff --git a/src/emuvim/dcemulator/net.py b/src/emuvim/dcemulator/net.py
index cf85085..8f627b5 100755
--- a/src/emuvim/dcemulator/net.py
+++ b/src/emuvim/dcemulator/net.py
@@ -457,7 +457,7 @@
                 kwargs['switch_outport_name'] = dst_sw_outport_name
                 kwargs['skip_vlan_tag'] = True
 
-                monitor_placement = kwargs.get('monitor_placement')
+                monitor_placement = kwargs.get('monitor_placement').strip()
                 # put monitor flow at the dst switch
                 insert_flow = False
                 if monitor_placement == 'tx' and path.index(current_hop) == 0:  # first node:
@@ -465,7 +465,7 @@
                 # put monitoring flow at the src switch
                 elif monitor_placement == 'rx' and path.index(current_hop) == len(path) - 1:  # last node:
                     insert_flow = True
-                else:
+                elif monitor_placement not in ['rx', 'tx']:
                     LOG.exception('invalid monitor command: {0}'.format(monitor_placement))
 
 
@@ -524,7 +524,7 @@
                 return ret
             else:
                 # no chain existing (or E-LAN) -> install normal chain
-                LOG.warning('*** installing monitoring chain without pre-defined chain from {0}:{1} -> {2}:{3}'.
+                LOG.warning('*** installing monitoring chain without pre-defined NSD chain from {0}:{1} -> {2}:{3}'.
                             format(vnf_src_name, vnf_src_interface, vnf_dst_name, vnf_dst_interface))
                 pass