diff --git a/GIT-VIRL-HS-Fulda/advcompnet-lab1-dcn-scenario3.virl b/GIT-VIRL-HS-Fulda/advcompnet-lab1-dcn-scenario3.virl
index e2ec496..a3710da 100644
--- a/GIT-VIRL-HS-Fulda/advcompnet-lab1-dcn-scenario3.virl
+++ b/GIT-VIRL-HS-Fulda/advcompnet-lab1-dcn-scenario3.virl
@@ -1,5 +1,8 @@
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
 <topology xmlns="http://www.cisco.com/VIRL" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" schemaVersion="0.9" xsi:schemaLocation="http://www.cisco.com/VIRL https://raw.github.com/CiscoVIRL/schema/v0.9/virl.xsd">
+    <extensions>
+        <entry key="management_network" type="String">exclusive</entry>
+    </extensions>
     <node name="veos-1" type="SIMPLE" subtype="vEOS" location="413,31">
         <extensions>
             <entry key="config" type="String">! device: vEOS-1 (vEOS, EOS-4.14.2F)&#xD;