make the vlan an edge..

embedlab1.getxt

@@ -1,5 +1,5 @@
 [ Controller  ] { label: Controller\n172.30.15.10 }
-[ vlan1 ] { label: VLAN 1\n172.30.15.0/24 }
+[ vlan1 ] { label: VLAN 1\n172.30.15.0/24; shape: edge }
 [ router ] { label: Router\n172.30.15.1 }
 [ switch ] { label: Switch\n172.30.15.20 }