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diff --git a/network/service_net_map.j2.yaml b/network/service_net_map.j2.yaml
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+heat_template_version: ocata
+
+description: >
+  Mapping of service_name_network -> network name
+
+parameters:
+  ServiceNetMap:
+    description: Mapping of service_name -> network name. Typically set
+                 via parameter_defaults in the resource registry.  This
+                 mapping overrides those in ServiceNetMapDefaults.
+                 Note that the key in this map must match the service_name
+                 in the service template, e.g if the service_name is heat_api
+                 the key must be either heat_api_network, or optionally
+                 HeatApiNetwork (which will be internally converted to
+                 transform captalization to underscores).
+    default: {}
+    type: json
+
+  # Note that the key in this map must match the service_name
+  # see the description above about conversion from CamelCase to
+  # snake_case - the names must still match when converted
+  ServiceNetMapDefaults:
+    default:
+      ApacheNetwork: internal_api
+      NeutronTenantNetwork: tenant
+      CeilometerApiNetwork: internal_api
+      AodhApiNetwork: internal_api
+      PankoApiNetwork: internal_api
+      BarbicanApiNetwork: internal_api
+      GnocchiApiNetwork: internal_api
+      MongodbNetwork: internal_api
+      CinderApiNetwork: internal_api
+      CinderIscsiNetwork: storage
+      GlanceApiNetwork: storage
+      IronicApiNetwork: ctlplane
+      IronicNetwork: ctlplane
+      KeystoneAdminApiNetwork: ctlplane # allows undercloud to config endpoints
+      KeystonePublicApiNetwork: internal_api
+      ManilaApiNetwork: internal_api
+      NeutronApiNetwork: internal_api
+      HeatApiNetwork: internal_api
+      HeatApiCfnNetwork: internal_api
+      HeatApiCloudwatchNetwork: internal_api
+      NovaApiNetwork: internal_api
+      NovaPlacementNetwork: internal_api
+      NovaMetadataNetwork: internal_api
+      NovaVncProxyNetwork: internal_api
+      SwiftStorageNetwork: storage_mgmt
+      SwiftProxyNetwork: storage
+      SaharaApiNetwork: internal_api
+      HorizonNetwork: internal_api
+      MemcachedNetwork: internal_api
+      RabbitmqNetwork: internal_api
+      RedisNetwork: internal_api
+      MysqlNetwork: internal_api
+      CephClusterNetwork: storage_mgmt
+      CephMonNetwork: storage
+      CephRgwNetwork: storage
+      PublicNetwork: external
+      OpendaylightApiNetwork: internal_api
+      OvnDbsNetwork: internal_api
+      MistralApiNetwork: internal_api
+      ZaqarApiNetwork: internal_api
+      # We special-case the default ResolveNetwork for the CephStorage role
+      # for backwards compatibility, all other roles default to internal_api
+      CephStorageHostnameResolveNetwork: storage
+      EtcdNetwork: internal_api
+{% for role in roles if role.name != 'CephStorage' %}
+      {{role.name}}HostnameResolveNetwork: internal_api
+{% endfor %}
+    description: Mapping of service_name -> network name. Typically set
+                 via parameter_defaults in the resource registry.
+    type: json
+
+  # We define mappings to work around names that break when doing the
+  # CamelCase to snake_case conversion to align with service_names
+  ServiceNetMapDeprecatedMapping:
+    default:
+      MongoDbNetwork: MongodbNetwork
+      RabbitMqNetwork: RabbitmqNetwork
+      CephPublicNetwork: CephMonNetwork
+      SwiftMgmtNetwork: SwiftStorageNetwork
+    description: Mapping older deprecated service names, intended for
+                 internal use only, this will be removed in future.
+    type: json
+
+parameter_groups:
+- label: deprecated
+  description: Do not use deprecated params, they will be removed.
+  parameters:
+  - ServiceNetMapDeprecatedMapping
+
+outputs:
+  service_net_map:
+    value:
+      map_merge:
+        - {get_param: ServiceNetMapDefaults}
+        - map_replace:
+           - {get_param: ServiceNetMap}
+           - keys: {get_param: ServiceNetMapDeprecatedMapping}
+
+  service_net_map_lower:
+    value:
+      # This does a conversion from CamelCase to snake_case,
+      # e.g HeatApiNetwork becomes heat_api_network so it
+      # matches the service names.
+      yaql:
+        expression: dict($.data.map.items().select([ regex(`([a-z0-9])([A-Z])`).replace($[0], '\\1_\\2').toLower(), $[1]]))
+        data:
+          map:
+            map_merge:
+              - {get_param: ServiceNetMapDefaults}
+              - map_replace:
+                 - {get_param: ServiceNetMap}
+                 - keys: {get_param: ServiceNetMapDeprecatedMapping}