Assert that bd0 is reserved

config/bridgedomain.py

@@ -122,6 +122,10 @@ def validate_bridgedomains(yaml):
         bd_mtu = 1500
         if 'mtu' in iface:
             bd_mtu = iface['mtu']
+        instance = int(ifname[2:])
+        if instance == 0:
+            msgs.append("bridgedomain %s is reserved" % ifname)
+            result = False
 
         if 'addresses' in iface and not 'lcp' in iface:
             msgs.append("bridgedomain %s has an address but no LCP" % ifname)

unittest/yaml/error-lcp-unique2.yaml

@@ -5,7 +5,8 @@ test:
      - "interface .* does not have a unique LCP name"
      - "loopback .* does not have a unique LCP name"
      - "bridgedomain .* does not have a unique LCP name"
-    count: 3
+     - "bridgedomain bd0 is reserved"
+    count: 4
 ---
 interfaces:
   GigabitEthernet1/0/0:
@@ -22,5 +23,6 @@ loopbacks:
 
 bridgedomains:
   bd0:
+    description: "bd_id 0 in VPP is reserved"
     lcp: "e1"
     interfaces: [ GigabitEthernet2/0/0, GigabitEthernet2/0/1 ]