diff --git a/release/models/aft/openconfig-aft-types.yang b/release/models/aft/openconfig-aft-types.yang
index 56d920b5f..0f9117bc8 100644
--- a/release/models/aft/openconfig-aft-types.yang
+++ b/release/models/aft/openconfig-aft-types.yang
@@ -99,6 +99,14 @@ module openconfig-aft-types {
         description
           "The encapsulation header is UDP packet header.";
       }
+      enum UDPV4 {
+        description
+          "The encapsulation header is UDP packet header followed by IPv4 packet header.";
+      }
+      enum UDPV6 {
+        description
+          "The encapsulation header is UDP packet header followed by IPv6 packet header.";
+      }
     }
     description
       "Types of tunnel encapsulation that are supported by systems as either