Adding BNG port mapping for BBSIM

Change-Id: I5a8856fd2a7eea672985ac42ba5ac2317d77eac1
diff --git a/tosca-configs/bbsim/bbsim-16.yaml b/tosca-configs/bbsim/bbsim-16.yaml
index 44c1d5d..746166b 100644
--- a/tosca-configs/bbsim/bbsim-16.yaml
+++ b/tosca-configs/bbsim/bbsim-16.yaml
@@ -53,6 +53,15 @@
             node: service#volt
             relationship: tosca.relationships.BelongsToOne
 
+    # map the BNG to a port
+    # this is not really used by BBSIM as there's no data-plane traffic,
+    # but it's required by NEM to configure the crossconnect
+    bngmapping:
+      type: tosca.nodes.BNGPortMapping
+      properties:
+        s_tag: any
+        switch_port: 1
+
     # DHCP L2 Relay config
     onos_app#dhcpl2relay:
       type: tosca.nodes.ONOSApp