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.")