update example topologies
diff --git a/src/emuvim/examples/demo_topo_3pop.py b/src/emuvim/examples/demo_topo_3pop.py
index 4dd011c..8020fc8 100755
--- a/src/emuvim/examples/demo_topo_3pop.py
+++ b/src/emuvim/examples/demo_topo_3pop.py
@@ -67,7 +67,7 @@
 
 
     # specify a vnfd file to be deployed as internal SAP:
-    sap_vnfd = 'vepc_sap_vnfd.yml'
+    sap_vnfd = 'custom_sap_vnfd.yml'
     dir_path = os.path.dirname(__file__)
     sap_vnfd_path = os.path.join(dir_path, sap_vnfd)
     # sap_vnfd_path = None