diff --git a/example-data/nfv.xml b/example-data/nfv.xml
index 92db22da2c2bf0a21920310c7d5a8c1eae2d4aa3..fef24225243a2311e5f8f2ea64eb8ea59fd51cff 100644
--- a/example-data/nfv.xml
+++ b/example-data/nfv.xml
@@ -224,7 +224,9 @@
     <virtual-link-desc>
       <id>fw2dpi</id>
       <connectivity-type>
-        <layer-protocol>Ethernet</layer-protocol>
+        <layer-protocol>
+	  <protocol>Ethernet</protocol>
+	</layer-protocol>
       </connectivity-type>
       <df>
         <id>normal</id>
@@ -237,7 +239,9 @@
     <virtual-link-desc>
       <id>mgmt</id>
       <connectivity-type>
-        <layer-protocol>IPv4</layer-protocol>
+        <layer-protocol>
+	  <protocol>IPv4</protocol>
+	</layer-protocol>
       </connectivity-type>
       <df>
         <id>normal</id>
@@ -250,7 +254,9 @@
     <virtual-link-desc>
       <id>r2fw</id>
       <connectivity-type>
-        <layer-protocol>Ethernet</layer-protocol>
+        <layer-protocol>
+	  <protocol>Ethernet</protocol>
+	</layer-protocol>
       </connectivity-type>
       <df>
         <id>normal</id>
@@ -473,7 +479,9 @@
     <virtual-link-desc>
       <id>r2fw</id>
       <connectivity-type>
-        <layer-protocol>IPv4</layer-protocol>
+        <layer-protocol>
+	  <protocol>IPv4</protocol>
+	</layer-protocol>
       </connectivity-type>
       <df>
         <id>r2fw</id>
diff --git a/src/yang/etsi-nfv-common.yang b/src/yang/etsi-nfv-common.yang
index 09ff7ee9045cc9ce4c13fb58c17a32f503afe982..50b371f6a341cf7f791e70345af39a2430f59a62 100644
--- a/src/yang/etsi-nfv-common.yang
+++ b/src/yang/etsi-nfv-common.yang
@@ -253,14 +253,20 @@ submodule etsi-nfv-common {
 
   grouping connectivity-type {
     container connectivity-type {
-      leaf layer-protocol {
-        mandatory true;
-        type identityref {
-          base layer-protocol;
-        }
+      list layer-protocol {
+	key "protocol";
+
+	leaf protocol {
+          type identityref {
+            base layer-protocol;
+          }
+	}
         description
-          "Identifies the protocol this VL gives access to (Ethernet,
-           MPLS, ODU2, IPV4, IPV6, Pseudo-Wire).";
+          "Identifies the protocols that the VL uses (Ethernet,
+           MPLS, ODU2, IPV4, IPV6, Pseudo-Wire). The top layer
+           protocol of the VL protocol stack shall always be provided.
+           The lower layer protocols may be included when there are
+           specific requirements on these layers.";
         reference
           "GS NFV IFA011: Section 7.1.7.3, ConnectivityType
            information element.";