diff --git a/puppet/compute-role.yaml b/puppet/compute-role.yaml
index 7bcee47da2..e2cce5fbab 100644
--- a/puppet/compute-role.yaml
+++ b/puppet/compute-role.yaml
@@ -37,7 +37,7 @@ parameters:
     type: string
   NeutronPublicInterface:
     default: nic1
-    description: A port to add to the NeutronPhysicalBridge.
+    description: Which interface to add to the NeutronPhysicalBridge.
     type: string
   NodeIndex:
     type: number
diff --git a/puppet/controller-role.yaml b/puppet/controller-role.yaml
index 6a03265660..10cfac7958 100644
--- a/puppet/controller-role.yaml
+++ b/puppet/controller-role.yaml
@@ -58,9 +58,13 @@ parameters:
     type: string
     constraints:
       - custom_constraint: nova.keypair
+  NeutronPhysicalBridge:
+    default: 'br-ex'
+    description: An OVS bridge to create for accessing external networks.
+    type: string
   NeutronPublicInterface:
     default: nic1
-    description: What interface to bridge onto br-ex for network nodes.
+    description: Which interface to add to the NeutronPhysicalBridge.
     type: string
   ServiceNetMap:
     default: {}
@@ -431,7 +435,7 @@ resources:
           - {get_param: NetworkDeploymentActions}
           - []
       input_values:
-        bridge_name: br-ex
+        bridge_name: {get_param: NeutronPhysicalBridge}
         interface_name: {get_param: NeutronPublicInterface}
 
   # Resource for site-specific injection of root certificate
diff --git a/puppet/role.role.j2.yaml b/puppet/role.role.j2.yaml
index 320bf991a0..5ab763baa0 100644
--- a/puppet/role.role.j2.yaml
+++ b/puppet/role.role.j2.yaml
@@ -28,9 +28,13 @@ parameters:
     constraints:
       - custom_constraint: nova.keypair
 {% endif %}
+  NeutronPhysicalBridge:
+    default: 'br-ex'
+    description: An OVS bridge to create for accessing tenant networks.
+    type: string
   NeutronPublicInterface:
     default: nic1
-    description: What interface to bridge onto br-ex for network nodes.
+    description: Which interface to add to the NeutronPhysicalBridge.
     type: string
   ServiceNetMap:
     default: {}
@@ -409,7 +413,7 @@ resources:
       server: {get_resource: {{role}}}
       actions: {get_param: NetworkDeploymentActions}
       input_values:
-        bridge_name: br-ex
+        bridge_name: {get_param: NeutronPhysicalBridge}
         interface_name: {get_param: NeutronPublicInterface}
       actions:
         if: