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diff --git a/ntsimulator/yang/x-ran/xran-udp-echo.yang b/ntsimulator/yang/x-ran/xran-udp-echo.yang
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+module xran-udp-echo {
+  yang-version 1.1;
+  namespace "urn:xran:udpecho:1.0";
+  prefix "xran-echo";
+
+  import xran-interfaces {
+    prefix "xran-int";
+  }
+
+  organization "xRAN Forum";
+
+  contact
+    "www.xran.org";
+
+  description
+    "This module covers off aspects of llss-CU to RU interface transport
+    verification for UDP/IP based C/U plane connections based on UDP Echo.
+
+    Copyright 2018 the xRAN Forum.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 'AS IS'
+    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+    ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+    POSSIBILITY OF SUCH DAMAGE.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright notice,
+    this list of conditions and the above disclaimer.
+    * Redistributions in binary form must reproduce the above copyright notice,
+    this list of conditions and the above disclaimer in the documentation
+    and/or other materials provided with the distribution.
+    * Neither the Members of the xRAN Forum nor the names of its
+    contributors may be used to endorse or promote products derived from
+    this software without specific prior written permission.";
+
+  revision "2018-07-20" {
+    description
+      "version 1.0.0 - First release of the xRAN YANG M-Plane models.
+
+      This version of the model supports v01.00 of the corrsponding xRAN
+      M-Plane Specification.";
+    reference "XRAN-FH.MP.0-v01.00";
+  }
+
+  container udp-echo-configuration {
+    if-feature xran-int:UDPIP-BASED-CU-PLANE;
+    description "container for the configuration of udp echo";
+
+    leaf enable-udp-echo {
+      type boolean;
+      default false;
+      description
+        "whether RU's UDP ech server is enabled";
+    }
+
+    leaf dscp-config {
+      type enumeration {
+        enum REFLECTIVE {
+          description
+            "DSCP in echoed datagrams is copied from received datagram";
+        }
+        enum EF {
+          description
+            "DSCP in echoed datagrams is always be set to expeditied
+            forwarding Per Hop Behaviour.";
+        }
+      }
+      default EF;
+      description "configuration of UDP echo DSCP";
+    }
+
+    leaf echo-replies-transmitted {
+      type uint32;
+      config false;
+      description
+        "The total number of UDP echo replies transmitted by the RU.";
+    }
+  }
+}