diff --git a/samples/tosca-templates/vnfd/tosca-vnfd-cpu-dedicate.yaml b/samples/tosca-templates/vnfd/tosca-vnfd-cpu-dedicate.yaml
index 623e390e0..00b7d45bb 100644
--- a/samples/tosca-templates/vnfd/tosca-vnfd-cpu-dedicate.yaml
+++ b/samples/tosca-templates/vnfd/tosca-vnfd-cpu-dedicate.yaml
@@ -33,5 +33,5 @@ topology_template:
     VL1:
       type: tosca.nodes.nfv.VL
       properties:
-        network_name: net-mgmt
-        vendor: Tacker
\ No newline at end of file
+        network_name: net_mgmt
+        vendor: Tacker
diff --git a/samples/tosca-templates/vnfd/tosca-vnfd-hugepages.yaml b/samples/tosca-templates/vnfd/tosca-vnfd-hugepages.yaml
index 2021b2b2d..be99ff4ed 100644
--- a/samples/tosca-templates/vnfd/tosca-vnfd-hugepages.yaml
+++ b/samples/tosca-templates/vnfd/tosca-vnfd-hugepages.yaml
@@ -32,5 +32,5 @@ topology_template:
     VL1:
       type: tosca.nodes.nfv.VL
       properties:
-        network_name: net-mgmt
-        vendor: Tacker
\ No newline at end of file
+        network_name: net_mgmt
+        vendor: Tacker
diff --git a/samples/tosca-templates/vnfd/tosca-vnfd-numacount.yaml b/samples/tosca-templates/vnfd/tosca-vnfd-numacount.yaml
index 598050cd7..c640068fe 100644
--- a/samples/tosca-templates/vnfd/tosca-vnfd-numacount.yaml
+++ b/samples/tosca-templates/vnfd/tosca-vnfd-numacount.yaml
@@ -32,5 +32,5 @@ topology_template:
     VL1:
       type: tosca.nodes.nfv.VL
       properties:
-        network_name: net-mgmt
-        vendor: Tacker
\ No newline at end of file
+        network_name: net_mgmt
+        vendor: Tacker
diff --git a/samples/tosca-templates/vnfd/tosca-vnfd-numadefine.yaml b/samples/tosca-templates/vnfd/tosca-vnfd-numadefine.yaml
index 67d912c72..80b1071a1 100644
--- a/samples/tosca-templates/vnfd/tosca-vnfd-numadefine.yaml
+++ b/samples/tosca-templates/vnfd/tosca-vnfd-numadefine.yaml
@@ -42,5 +42,5 @@ topology_template:
     VL1:
       type: tosca.nodes.nfv.VL
       properties:
-        network_name: net-mgmt
+        network_name: net_mgmt
         vendor: Tacker
diff --git a/samples/tosca-templates/vnfd/tosca-vnfd-sriov.yaml b/samples/tosca-templates/vnfd/tosca-vnfd-sriov.yaml
index 96cb2de51..5239d6375 100644
--- a/samples/tosca-templates/vnfd/tosca-vnfd-sriov.yaml
+++ b/samples/tosca-templates/vnfd/tosca-vnfd-sriov.yaml
@@ -36,7 +36,7 @@ topology_template:
     VL1:
       type: tosca.nodes.nfv.VL
       properties:
-        network_name: net-mgmt
+        network_name: net_mgmt
         vendor: Tacker
 
     VL2:
diff --git a/samples/tosca-templates/vnfd/tosca-vnfd-vcpu-topology.yaml b/samples/tosca-templates/vnfd/tosca-vnfd-vcpu-topology.yaml
index 593b8fd71..d43ce329b 100644
--- a/samples/tosca-templates/vnfd/tosca-vnfd-vcpu-topology.yaml
+++ b/samples/tosca-templates/vnfd/tosca-vnfd-vcpu-topology.yaml
@@ -35,5 +35,5 @@ topology_template:
     VL1:
       type: tosca.nodes.nfv.VL
       properties:
-        network_name: net-mgmt
-        vendor: Tacker
\ No newline at end of file
+        network_name: net_mgmt
+        vendor: Tacker