diff --git a/src/emuvim/api/zerorpc/compute.py b/src/emuvim/api/zerorpc/compute.py
index 6e4a083..f5d0799 100644
--- a/src/emuvim/api/zerorpc/compute.py
+++ b/src/emuvim/api/zerorpc/compute.py
@@ -56,7 +56,7 @@
     def __init__(self, dcs):
         self.dcs = dcs
 
-    def compute_action_start(self, dc_label, compute_name, image, command, network):
+    def compute_action_start(self, dc_label, compute_name, image, network=None, command=None):
         """
         Start a new compute instance: A docker container
         :param dc_label: name of the DC
diff --git a/src/emuvim/api/zerorpc/network.py b/src/emuvim/api/zerorpc/network.py
index 8278422..5a353fe 100644
--- a/src/emuvim/api/zerorpc/network.py
+++ b/src/emuvim/api/zerorpc/network.py
@@ -64,27 +64,27 @@
     def __init__(self, net):
         self.net = net
 
-    def network_action_start(self, vnf_src_name, vnf_dst_name, vnf_src_interface=None, vnf_dst_interface=None):
+    def network_action_start(self, vnf_src_name, vnf_dst_name, vnf_src_interface=None, vnf_dst_interface=None, weight=None):
         # call DCNetwork method, not really datacenter specific API for now...
         # provided dc name needs to be part of API endpoint
         # no check if vnfs are really connected to this datacenter...
         logging.debug("RPC CALL: network chain start")
         try:
             c = self.net.setChain(
-                vnf_src_name, vnf_dst_name, vnf_src_interface, vnf_dst_interface)
+                vnf_src_name, vnf_dst_name, vnf_src_interface, vnf_dst_interface, weight=weight)
             return str(c)
         except Exception as ex:
             logging.exception("RPC error.")
             return ex.message
 
-    def network_action_stop(self, vnf_src_name, vnf_dst_name, vnf_src_interface=None, vnf_dst_interface=None):
+    def network_action_stop(self, vnf_src_name, vnf_dst_name, vnf_src_interface=None, vnf_dst_interface=None, weight=None):
         # call DCNetwork method, not really datacenter specific API for now...
         # provided dc name needs to be part of API endpoint
         # no check if vnfs are really connected to this datacenter...
         logging.debug("RPC CALL: network chain stop")
         try:
             c = self.net.setChain(
-                vnf_src_name, vnf_dst_name, vnf_src_interface, vnf_dst_interface, cmd='del-flows')
+                vnf_src_name, vnf_dst_name, vnf_src_interface, vnf_dst_interface, cmd='del-flows', weight=weight)
             return c
         except Exception as ex:
             logging.exception("RPC error.")
diff --git a/src/emuvim/cli/compute.py b/src/emuvim/cli/compute.py
index 179ae1e..f2fdc62 100755
--- a/src/emuvim/cli/compute.py
+++ b/src/emuvim/cli/compute.py
@@ -35,8 +35,9 @@
             args.get("datacenter"),
             args.get("name"),
             args.get("image"),
-            args.get("docker_command"),
-            nw_list)
+            network=nw_list,
+            command=args.get("docker_command")
+            )
         pp.pprint(r)
 
     def stop(self, args):
diff --git a/src/emuvim/cli/network.py b/src/emuvim/cli/network.py
index c27da59..5b0aa51 100755
--- a/src/emuvim/cli/network.py
+++ b/src/emuvim/cli/network.py
@@ -32,12 +32,14 @@
         vnf_src_interface = self._parse_vnf_interface(args.get("source"))
         vnf_dst_name = self._parse_vnf_name(args.get("destination"))
         vnf_dst_interface = self._parse_vnf_interface(args.get("destination"))
+        weight = args.get("weight")
         r = self.c.network_action_start(
             #args.get("datacenter"),
             vnf_src_name,
             vnf_dst_name,
             vnf_src_interface,
-            vnf_dst_interface)
+            vnf_dst_interface,
+            weight=weight)
         pp.pprint(r)
 
     def remove(self, args):
@@ -45,12 +47,14 @@
         vnf_src_interface = self._parse_vnf_interface(args.get("source"))
         vnf_dst_name = self._parse_vnf_name(args.get("destination"))
         vnf_dst_interface = self._parse_vnf_interface(args.get("destination"))
+        weight = args.get("weight")
         r = self.c.network_action_stop(
             #args.get("datacenter"),
             vnf_src_name,
             vnf_dst_name,
             vnf_src_interface,
-            vnf_dst_interface)
+            vnf_dst_interface,
+            weight=weight)
         pp.pprint(r)
 
     def _parse_vnf_name(self, vnf_name_str):
@@ -79,6 +83,9 @@
 parser.add_argument(
     "--destination", "-dst", dest="destination",
     help="vnf name of the destination of the chain")
+parser.add_argument(
+    "--weight", "-w", dest="weight",
+    help="weight metric to calculate the path")
 
 def main(argv):
     args = vars(parser.parse_args(argv))
diff --git a/src/emuvim/dcemulator/net.py b/src/emuvim/dcemulator/net.py
index dbfde5c..54d578d 100755
--- a/src/emuvim/dcemulator/net.py
+++ b/src/emuvim/dcemulator/net.py
@@ -8,6 +8,9 @@
 import time
 from subprocess import Popen
 import os
+import re
+
+
 
 from mininet.net import Dockernet
 from mininet.node import Controller, DefaultController, OVSSwitch, OVSKernelSwitch, Docker, RemoteController
@@ -127,16 +130,35 @@
             if "id" in params["params2"]:
                 node2_port_id = params["params2"]["id"]
 
+
+
         # add edge and assigned port number to graph in both directions between node1 and node2
         # port_id: id given in descriptor (if available, otherwise same as port)
         # port: portnumber assigned by Dockernet
 
-        self.DCNetwork_graph.add_edge(node1.name, node2.name,
-                                      attr_dict={'src_port_id': node1_port_id, 'src_port': node1.ports[link.intf1],
-                                       'dst_port_id': node2_port_id, 'dst_port': node2.ports[link.intf2]})
-        self.DCNetwork_graph.add_edge(node2.name, node1.name,
-                                      attr_dict={'src_port_id': node2_port_id, 'src_port': node2.ports[link.intf2],
-                                        'dst_port_id': node1_port_id, 'dst_port': node1.ports[link.intf1]})
+        attr_dict = {}
+        # possible weight metrics allowed by TClink class:
+        weight_metrics = ['bw', 'delay', 'jitter', 'loss']
+        edge_attributes = [p for p in params if p in weight_metrics]
+        for attr in edge_attributes:
+            # if delay: strip ms (need number as weight in graph)
+            match = re.search('([0-9]*\.?[0-9]+)', params[attr])
+            if match:
+                attr_number = match.group(1)
+            else:
+                attr_number = None
+            attr_dict[attr] = attr_number
+
+
+        attr_dict2 = {'src_port_id': node1_port_id, 'src_port': node1.ports[link.intf1],
+                     'dst_port_id': node2_port_id, 'dst_port': node2.ports[link.intf2]}
+        attr_dict2.update(attr_dict)
+        self.DCNetwork_graph.add_edge(node1.name, node2.name, attr_dict=attr_dict2)
+
+        attr_dict2 = {'src_port_id': node2_port_id, 'src_port': node2.ports[link.intf2],
+                     'dst_port_id': node1_port_id, 'dst_port': node1.ports[link.intf1]}
+        attr_dict2.update(attr_dict)
+        self.DCNetwork_graph.add_edge(node2.name, node1.name, attr_dict=attr_dict2)
 
         return link
 
@@ -194,7 +216,7 @@
         CLI(self)
 
     # to remove chain do setChain( src, dst, cmd='del-flows')
-    def setChain(self, vnf_src_name, vnf_dst_name, vnf_src_interface=None, vnf_dst_interface=None, cmd='add-flow'):
+    def setChain(self, vnf_src_name, vnf_dst_name, vnf_src_interface=None, vnf_dst_interface=None, cmd='add-flow', weight=None):
 
         #check if port is specified (vnf:port)
         if vnf_src_interface is None:
@@ -237,7 +259,7 @@
         # get shortest path
         #path = nx.shortest_path(self.DCNetwork_graph, vnf_src_name, vnf_dst_name)
         try:
-            path = nx.shortest_path(self.DCNetwork_graph, src_sw, dst_sw)
+            path = nx.shortest_path(self.DCNetwork_graph, src_sw, dst_sw, weight=weight)
         except:
             logging.info("No path could be found between {0} and {1}".format(vnf_src_name, vnf_dst_name))
             return "No path could be found between {0} and {1}".format(vnf_src_name, vnf_dst_name)
diff --git a/src/emuvim/dcemulator/prometheus.yml b/src/emuvim/dcemulator/prometheus.yml
old mode 100644
new mode 100755
diff --git a/src/emuvim/examples/monitoring_demo_topology.py b/src/emuvim/examples/monitoring_demo_topology.py
index 16c2b50..20f3ba0 100755
--- a/src/emuvim/examples/monitoring_demo_topology.py
+++ b/src/emuvim/examples/monitoring_demo_topology.py
@@ -60,8 +60,8 @@
        to define you topology.
        These links can use Mininet's features to limit bw, add delay or jitter.
     """
-    net.addLink(dc1, dc2)
-    net.addLink("datacenter1", s1)
+    net.addLink(dc1, dc2, delay="10ms")
+    net.addLink("datacenter1", s1, delay="20ms")
     net.addLink(s1, dc3)
     net.addLink(s1, "datacenter4")