diff --git a/example-data/nfv.xml b/example-data/nfv.xml
index 59c0f5b3b27cf2b7bbd969150808bdb36c5c6b8b..a956b2b51ebb5f5c36cab9095f918b8eefc8bded 100644
--- a/example-data/nfv.xml
+++ b/example-data/nfv.xml
@@ -242,7 +242,9 @@
     <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>
@@ -255,7 +257,9 @@
     <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>
@@ -268,7 +272,9 @@
     <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>
@@ -491,7 +497,9 @@
     <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..23092426674b924167c950a593d8e903b548d710 100644
--- a/src/yang/etsi-nfv-common.yang
+++ b/src/yang/etsi-nfv-common.yang
@@ -6,13 +6,13 @@ submodule etsi-nfv-common {
   description
     "Common data types for ETSI data models.";
 
-  revision 2018-06-19 {
+  revision 2019-03-18 {
     description
       "Initial revision
 
        Common data structures to support VNFD and NSD according to:
-       ETSI GS NFV-IFA 014 Ed251v244
-       ETSI GS NFV-IFA 011 Ed251v243";
+       ETSI GS NFV-IFA 014 Ed261v252
+       ETSI GS NFV-IFA 011 Ed261v254";
   }
 
   /*
@@ -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.";
diff --git a/src/yang/etsi-nfv-ns.yang b/src/yang/etsi-nfv-ns.yang
index 47fd7ad5186e1abeee96355d77b2fafcfbcd6eb2..93264f7ab05bd433cbbc7cf95eff1f66bc01ce4d 100644
--- a/src/yang/etsi-nfv-ns.yang
+++ b/src/yang/etsi-nfv-ns.yang
@@ -11,14 +11,14 @@ submodule etsi-nfv-ns {
   description
     "Models for NS according to ETSI GS NFV-IFA 014.";
 
-  revision 2017-01-20 {
+  revision 2019-03-18 {
     description
       "Initial revision
        Common data structure to support NSD according to:
-       ETSI GS NFV-IFA 011 Ed251v243";
+       ETSI GS NFV-IFA 014 Ed261v252";
 
     reference
-      "ETSI GS NFV-IFA 011 Ed251v243";
+      "ETSI GS NFV-IFA 014 Ed261v252";
   }
 
   grouping resource-handle {
diff --git a/src/yang/etsi-nfv-pnf.yang b/src/yang/etsi-nfv-pnf.yang
index 69450eefe4d02aad851f72f57894cf43a00c056e..ae7ef81fd3c4659ed7555fcc33202a7355113396 100644
--- a/src/yang/etsi-nfv-pnf.yang
+++ b/src/yang/etsi-nfv-pnf.yang
@@ -12,15 +12,15 @@ submodule etsi-nfv-pnf {
   description
     "Models for PNFD according to GS NFV-IFA 014.";
 
-  revision 2018-06-25 {
+  revision 2019-03-18 {
     description
       "Initial revision.
 
        Common data structure to support VNFD according to:
-       ETSI GS NFV-IFA 014 Ed251v244";
+       ETSI GS NFV-IFA 014 Ed261v252";
 
     reference
-      "ETSI GS NFV-IFA 014 Ed251v244";
+      "ETSI GS NFV-IFA 014 Ed261v252";
   }
 
   grouping pnfd {
diff --git a/src/yang/etsi-nfv-vnf.yang b/src/yang/etsi-nfv-vnf.yang
index 2760632edba73cbd8b5389d537f2bf060580413f..3a202cbbda233a40d9e2bd8291658e7a7c642a45 100755
--- a/src/yang/etsi-nfv-vnf.yang
+++ b/src/yang/etsi-nfv-vnf.yang
@@ -16,15 +16,15 @@ submodule etsi-nfv-vnf {
   description
     "Models for VNFD according to GS NFV-IFA 011.";
 
-  revision 2018-06-19 {
+  revision 2019-03-18 {
     description
       "Initial revision.
 
        Common data structure to support VNFD according to:
-       VNFD according to ETSI GS NFV-IFA 011 Ed251v243";
+       VNFD according to ETSI GS NFV-IFA 011 Ed261v254";
 
     reference
-      "ETSI GS NFV-IFA 011 Ed251v243";
+      "ETSI GS NFV-IFA 011 Ed261v254";
   }
 
   grouping virtual-network-interface-requirements {
@@ -1148,9 +1148,9 @@ submodule etsi-nfv-vnf {
               }
             }
             leaf cpd {
-              type leafref {
-                path "deref(../vdu-id)/../int-cpd/id";
-              }
+	      type leafref {
+		path "deref(../vdu-id)/../int-cpd/id";
+	      }
             }
           }
         }
diff --git a/src/yang/etsi-nfv.yang b/src/yang/etsi-nfv.yang
index a209fc30f22d3c0a1cbe136c512ca4ec9be6ac12..96d0db1afe03b81d01fd56e05d7021246ca3dcea 100644
--- a/src/yang/etsi-nfv.yang
+++ b/src/yang/etsi-nfv.yang
@@ -14,11 +14,11 @@ module etsi-nfv {
   description
     "Network Function Virtualization Descriptors";
 
-  revision 2018-06-13 {
+  revision 2019-03-18 {
     description
       "Initial revision.
-       NSD and PNFD according to ETSI GS NFV-IFA 014 Ed251v244
-       VNFD according to ETSI GS NFV-IFA 011 Ed251v243";
+       NSD and PNFD according to ETSI GS NFV-IFA 014 Ed261v252
+       VNFD according to ETSI GS NFV-IFA 011 Ed261v254";
   }
 
   container nfv {