Remove ipv6 specific network templates

This change renders the IPv6 versions of the isolated
networks using j2. To allow for backward compatibility,
there will be 2 versions of the network definitions,
<network>.yaml and <network>_v6.yaml. If the ip_subnet
contains an IPv6 address, or if ipv6: true is set on the
network definition in network_data.yaml, then the
<network>.yaml version will contain an IPv6 definition,
otherwise the <network>.yaml will be IPv4, and the
<network>_v6.yaml will be IPv6.

In a future follow-up patch, we will probably only
create the required versions of the networks, either
IPv4, IPv6, not both.

The ipv6_subnet, ipv6_allocation_pools, and ipv6_gateway
settings in the network_data.yaml definition file are
used for the <network>_v6.yaml network definition.
Note that these subnet/cidr/gateway definitions only set
the defaults, which can be overridden with parameters
set in an environment file.

Since the parameters for IP and subnet range are the
same (e.g. InternalApiNetCidr applies to both IPv4/v6),
only one version can be used at a time. If an operator
wishes to use dual-stack IPv4/IPv6, then two different
networks should be created, and both networks can be
applied to a single interface.

Note that the workflow for the operator is the same as
before this change, but a new example template has been
added to environments/network-environment-v6.yaml.

Change-Id: I0e674e4b1e43786717ae6416571dde3a0e11a5cc
Partially-Implements: blueprint composable-networks
Closes-bug: 1714115
(cherry picked from commit dd299f08bd6b1df43760148d83ce9b6e09ba6572)

12 files changed, 216 insertions, 473 deletions

diff --git a/environments/network-environment-v6.yaml b/environments/network-environment-v6.yaml
new file mode 100644
index 00000000..1617f897
--- /dev/null
+++ b/environments/network-environment-v6.yaml
@@ -0,0 +1,60 @@
+#This file is an example of an environment file for defining the isolated
+#networks and related parameters.
+resource_registry:
+  # Network Interface templates to use (these files must exist)
+  OS::TripleO::BlockStorage::Net::SoftwareConfig:
+    ../network/config/single-nic-vlans/cinder-storage.yaml
+  OS::TripleO::Compute::Net::SoftwareConfig:
+    ../network/config/single-nic-vlans/compute.yaml
+  OS::TripleO::Controller::Net::SoftwareConfig:
+    ../network/config/single-nic-vlans/controller.yaml
+  OS::TripleO::ObjectStorage::Net::SoftwareConfig:
+    ../network/config/single-nic-vlans/swift-storage.yaml
+  OS::TripleO::CephStorage::Net::SoftwareConfig:
+    ../network/config/single-nic-vlans/ceph-storage.yaml
+
+parameter_defaults:
+  # This section is where deployment-specific configuration is done
+  # CIDR subnet mask length for provisioning network
+  ControlPlaneSubnetCidr: '24'
+  # Gateway router for the provisioning network (or Undercloud IP)
+  ControlPlaneDefaultRoute: 192.168.24.254
+  EC2MetadataIp: 192.168.24.1  # Generally the IP of the Undercloud
+  # Customize the IP subnets to match the local environment
+  InternalApiNetCidr: 'fd00:fd00:fd00:2000::/64'
+  StorageNetCidr: 'fd00:fd00:fd00:3000::/64'
+  StorageMgmtNetCidr: 'fd00:fd00:fd00:4000::/64'
+  # Tenant tunneling network is IPv4 until IPv6 is fully supported
+  TenantNetCidr: 172.16.0.0/24
+  ExternalNetCidr: '2001:db8:fd00:1000::/64'
+  # Customize the VLAN IDs to match the local environment
+  InternalApiNetworkVlanID: 20
+  StorageNetworkVlanID: 30
+  StorageMgmtNetworkVlanID: 40
+  TenantNetworkVlanID: 50
+  ExternalNetworkVlanID: 10
+  # Customize the IP ranges on each network to use for static IPs and VIPs
+  InternalApiAllocationPools: [{'start': 'fd00:fd00:fd00:2000::10', 'end': 'fd00:fd00:fd00:2000:ffff:ffff:ffff:fffe'}]
+  StorageAllocationPools: [{'start': 'fd00:fd00:fd00:3000::10', 'end': 'fd00:fd00:fd00:3000:ffff:ffff:ffff:fffe'}]
+  StorageMgmtAllocationPools: [{'start': 'fd00:fd00:fd00:4000::10', 'end': 'fd00:fd00:fd00:4000:ffff:ffff:ffff:fffe'}]
+  TenantAllocationPools: [{'start': '172.16.0.10', 'end': '172.16.0.200'}]
+  # Leave room if the external network is also used for floating IPs
+  ExternalAllocationPools: [{'start': '2001:db8:fd00:1000::10', 'end': '2001:db8:fd00:1000:ffff:ffff:ffff:fffe'}]
+  # Gateway router for the external network
+  ExternalInterfaceDefaultRoute: '2001:db8:fd00:1000::1'
+  # Uncomment if using the Management Network (see network-management-v6.yaml)
+  # ManagementNetCidr: 'fd00:fd00:fd00:6000::/64'
+  # ManagementAllocationPools: [{'start': 'fd00:fd00:fd00:6000::10', 'end': 'fd00:fd00:fd00:6000:ffff:ffff:ffff:fffe'}]
+  # Use either this parameter or ControlPlaneDefaultRoute in the NIC templates
+  # ManagementInterfaceDefaultRoute: 'fd00:fd00:fd00:6000::1'
+  # Define the DNS servers (maximum 2) for the overcloud nodes
+  DnsServers: ["8.8.8.8","8.8.4.4"]
+  # List of Neutron network types for tenant networks (will be used in order)
+  NeutronNetworkType: 'vxlan,vlan'
+  # The tunnel type for the tenant network (vxlan or gre). Set to '' to disable tunneling.
+  NeutronTunnelTypes: 'vxlan'
+  # Neutron VLAN ranges per network, for example 'datacentre:1:499,tenant:500:1000':
+  NeutronNetworkVLANRanges: 'datacentre:1:1000'
+  # Customize bonding options, e.g. "mode=4 lacp_rate=1 updelay=1000 miimon=100"
+  # for Linux bonds w/LACP, or "bond_mode=active-backup" for OVS active/backup.
+  BondInterfaceOvsOptions: "bond_mode=active-backup"
diff --git a/j2_excludes.yaml b/j2_excludes.yaml
index 74fb3bb1..71d3d6e8 100644
--- a/j2_excludes.yaml
+++ b/j2_excludes.yaml
@@ -5,9 +5,4 @@
 # name:
 #   - puppet/cephstorage-role.yaml
 name:
-  - network/internal_api_v6.yaml
-  - network/external_v6.yaml
-  - network/storage_v6.yaml
-  - network/storage_mgmt_v6.yaml
-  - network/tenant_v6.yaml
-  - network/management_v6.yaml
+  - None
diff --git a/network/external_v6.yaml b/network/external_v6.yaml
deleted file mode 100644
index 9d1c3d00..00000000
--- a/network/external_v6.yaml
+++ /dev/null
@@ -1,76 +0,0 @@
-heat_template_version: pike
-
-description: >
-  External network. Public traffic, Neutron l3router for floating IPs/SNAT, etc.
-
-parameters:
-  # the defaults here work for static IP assignment (IPAM) only
-  ExternalNetCidr:
-    # OpenStack uses the EUI-64 address format, which requires a /64 prefix
-    default: '2001:db8:fd00:1000::/64'
-    description: Cidr for the external network.
-    type: string
-  ExternalNetValueSpecs:
-    default: {'provider:physical_network': 'external', 'provider:network_type': 'flat'}
-    description: Value specs for the external network.
-    type: json
-  ExternalNetAdminStateUp:
-    default: false
-    description: The admin state of the network.
-    type: boolean
-  ExternalNetShared:
-    default: false
-    description: Whether this network is shared across all tenants.
-    type: boolean
-  ExternalNetName:
-    default: external
-    description: The name of the external network.
-    type: string
-  ExternalSubnetName:
-    default: external_subnet
-    description: The name of the external subnet in Neutron.
-    type: string
-  ExternalAllocationPools:
-    default: [{'start': '2001:db8:fd00:1000::10', 'end': '2001:db8:fd00:1000:ffff:ffff:ffff:fffe'}]
-    description: Ip allocation pool range for the external network.
-    type: json
-  IPv6AddressMode:
-    default: dhcpv6-stateful
-    description: Neutron subnet IPv6 address mode
-    type: string
-  IPv6RAMode:
-    default: dhcpv6-stateful
-    description: Neutron subnet IPv6 router advertisement mode
-    type: string
-  ExternalInterfaceDefaultRoute:
-    default: '2001:db8:fd00:1000::1'
-    description: default route for the external network
-    type: string
-
-resources:
-  ExternalNetwork:
-    type: OS::Neutron::Net
-    properties:
-      admin_state_up: {get_param: ExternalNetAdminStateUp}
-      name: {get_param: ExternalNetName}
-      shared: {get_param: ExternalNetShared}
-      value_specs: {get_param: ExternalNetValueSpecs}
-
-  ExternalSubnet:
-    type: OS::Neutron::Subnet
-    properties:
-      ip_version: 6
-      ipv6_address_mode: {get_param: IPv6AddressMode}
-      ipv6_ra_mode: {get_param: IPv6RAMode}
-      cidr: {get_param: ExternalNetCidr}
-      name: {get_param: ExternalSubnetName}
-      network: {get_resource: ExternalNetwork}
-      allocation_pools: {get_param: ExternalAllocationPools}
-      gateway_ip: {get_param: ExternalInterfaceDefaultRoute}
-
-outputs:
-  OS::stack_id:
-    description: Neutron external network
-    value: {get_resource: ExternalNetwork}
-  subnet_cidr:
-    value: {get_attr: [ExternalSubnet, cidr]}
diff --git a/network/internal_api_v6.yaml b/network/internal_api_v6.yaml
deleted file mode 100644
index 6a0912e2..00000000
--- a/network/internal_api_v6.yaml
+++ /dev/null
@@ -1,72 +0,0 @@
-heat_template_version: pike
-
-description: >
-  Internal API network. Used for most APIs, Database, RPC.
-
-parameters:
-  # the defaults here work for static IP assignment (IPAM) only
-  InternalApiNetCidr:
-    # OpenStack uses the EUI-64 address format, which requires a /64 prefix
-    default: 'fd00:fd00:fd00:2000::/64'
-    description: Cidr for the internal_api network.
-    type: string
-  InternalApiNetValueSpecs:
-    default: {'provider:physical_network': 'internal_api', 'provider:network_type': 'flat'}
-    description: Value specs for the internal_api network.
-    type: json
-  InternalApiNetAdminStateUp:
-    default: false
-    description: The admin state of the network.
-    type: boolean
-  InternalApiNetShared:
-    default: false
-    description: Whether this network is shared across all tenants.
-    type: boolean
-  InternalApiNetName:
-    default: internal_api
-    description: The name of the internal_api network.
-    type: string
-  InternalApiSubnetName:
-    default: internal_api_subnet
-    description: The name of the internal_api subnet in Neutron.
-    type: string
-  InternalApiAllocationPools:
-    default: [{'start': 'fd00:fd00:fd00:2000::10', 'end': 'fd00:fd00:fd00:2000:ffff:ffff:ffff:fffe'}]
-    description: Ip allocation pool range for the internal_api network.
-    type: json
-  IPv6AddressMode:
-    default: dhcpv6-stateful
-    description: Neutron subnet IPv6 address mode
-    type: string
-  IPv6RAMode:
-    default: dhcpv6-stateful
-    description: Neutron subnet IPv6 router advertisement mode
-    type: string
-
-resources:
-  InternalApiNetwork:
-    type: OS::Neutron::Net
-    properties:
-      admin_state_up: {get_param: InternalApiNetAdminStateUp}
-      name: {get_param: InternalApiNetName}
-      shared: {get_param: InternalApiNetShared}
-      value_specs: {get_param: InternalApiNetValueSpecs}
-
-  InternalApiSubnet:
-    type: OS::Neutron::Subnet
-    properties:
-      ip_version: 6
-      ipv6_address_mode: {get_param: IPv6AddressMode}
-      ipv6_ra_mode: {get_param: IPv6RAMode}
-      cidr: {get_param: InternalApiNetCidr}
-      name: {get_param: InternalApiSubnetName}
-      network: {get_resource: InternalApiNetwork}
-      allocation_pools: {get_param: InternalApiAllocationPools}
-      gateway_ip: null
-
-outputs:
-  OS::stack_id:
-    description: Neutron internal network
-    value: {get_resource: InternalApiNetwork}
-  subnet_cidr:
-    value: {get_attr: [InternalApiSubnet, cidr]}
diff --git a/network/network.j2 b/network/network.j2
new file mode 100644
index 00000000..61a5b57c
--- /dev/null
+++ b/network/network.j2
@@ -0,0 +1,105 @@
+heat_template_version: pike
+
+description: >
+  {{network.name}} network definition (automatically generated).
+
+parameters:
+  # the defaults here work for static IP assignment (IPAM) only
+  {{network.name}}NetCidr:
+{%- if network.ipv6 or ipv6_override %}
+    default: "{{network.ipv6_subnet|default(network.ip_subnet|default(""))}}"
+{%- else %}
+    default: "{{network.ip_subnet|default("")}}"
+{%- endif %}
+    description: Cidr for the {{network.name_lower}} network.
+    type: string
+  {{network.name}}NetValueSpecs:
+    default: {'provider:physical_network': '{{network.name_lower}}', 'provider:network_type': 'flat'}
+    description: Value specs for the {{network.name_lower}} network.
+    type: json
+{%- if not ":" in network.ip_subnet and not network.ipv6 and not ipv6_override %}
+  {{network.name}}NetEnableDHCP:
+    default: false
+    description: Whether to enable DHCP on the associated subnet (IPv4 only).
+    type: boolean
+{%- endif %}
+  {{network.name}}NetAdminStateUp:
+    default: false
+    description: The admin state of the network.
+    type: boolean
+  {{network.name}}NetShared:
+    default: false
+    description: Whether this network is shared across all tenants.
+    type: boolean
+  {{network.name}}NetName:
+    default: {{network.name_lower}}
+    description: The name of the {{network.name_lower}} network.
+    type: string
+  {{network.name}}SubnetName:
+    default: {{network.name_lower}}_subnet
+    description: The name of the {{network.name_lower}} subnet in Neutron.
+    type: string
+  {{network.name}}AllocationPools:
+{%- if ":" in network.ip_subnet or network.ipv6 or ipv6_override %}
+    default: {{network.ipv6_allocation_pools|default(network.allocation_pools|default([]))}}
+{%- else %}
+    default: {{network.allocation_pools|default([])}}
+{%- endif %}
+    description: Ip allocation pool range for the {{network.name_lower}} network.
+    type: json
+{%- if ":" in network.ip_subnet or network.ipv6 or ipv6_override %}
+  IPv6AddressMode:
+    default: dhcpv6-stateful
+    description: Neutron subnet IPv6 address mode
+    type: string
+  IPv6RAMode:
+    default: dhcpv6-stateful
+    description: Neutron subnet IPv6 router advertisement mode
+    type: string
+{%- endif %}
+  {{network.name}}InterfaceDefaultRoute:
+{%- if network.ipv6 or ipv6_override %}
+    default: "{{network.gateway_ipv6|default(network.gateway_ip|default(''))}}"
+{%- else %}
+    default: "{{network.gateway_ip|default('')}}"
+{%- endif %}
+    description: default route for the {{network.name_lower}} network
+    type: string
+{%- if network.vlan %}
+  {{network.name}}NetworkVlanID:
+    default: {{network.vlan}}
+    description: Vlan ID for the {{network.name}} network traffic.
+    type: number
+{%- endif %}
+
+resources:
+  {{network.name}}Network:
+    type: OS::Neutron::Net
+    properties:
+      admin_state_up: {get_param: {{network.name}}NetAdminStateUp}
+      name: {get_param: {{network.name}}NetName}
+      shared: {get_param: {{network.name}}NetShared}
+      value_specs: {get_param: {{network.name}}NetValueSpecs}
+
+  {{network.name}}Subnet:
+    type: OS::Neutron::Subnet
+    properties:
+{%- if ":" in network.ip_subnet or network.ipv6 or ipv6_override %}
+      ip_version: 6
+      ipv6_address_mode: {get_param: IPv6AddressMode}
+      ipv6_ra_mode: {get_param: IPv6RAMode}
+{%- else %}
+      enable_dhcp: {get_param: {{network.name}}NetEnableDHCP}
+{%- endif %}
+      cidr: {get_param: {{network.name}}NetCidr}
+      name: {get_param: {{network.name}}SubnetName}
+      network: {get_resource: {{network.name}}Network}
+      allocation_pools: {get_param: {{network.name}}AllocationPools}
+      gateway_ip: {get_param: {{network.name}}InterfaceDefaultRoute}
+
+outputs:
+  OS::stack_id:
+    description: {{network.name_lower}} network
+    value: {get_resource: {{network.name}}Network}
+  subnet_cidr:
+    value: {get_attr: [{{network.name}}Subnet, cidr]}
diff --git a/network/network.network.j2.yaml b/network/network.network.j2.yaml
index 29d58cd5..d9ff6169 100644
--- a/network/network.network.j2.yaml
+++ b/network/network.network.j2.yaml
@@ -1,91 +1 @@
-heat_template_version: pike
-
-description: >
-  {{network.name}} network definition (automatically generated).
-
-parameters:
-  # the defaults here work for static IP assignment (IPAM) only
-  {{network.name}}NetCidr:
-    default: {{network.ip_subnet|default("")}}
-    description: Cidr for the {{network.name_lower}} network.
-    type: string
-  {{network.name}}NetValueSpecs:
-    default: {'provider:physical_network': '{{network.name_lower}}', 'provider:network_type': 'flat'}
-    description: Value specs for the {{network.name_lower}} network.
-    type: json
-  {{network.name}}NetAdminStateUp:
-    default: false
-    description: The admin state of the network.
-    type: boolean
-  {{network.name}}NetEnableDHCP:
-    default: false
-    description: Whether to enable DHCP on the associated subnet.
-    type: boolean
-  {{network.name}}NetShared:
-    default: false
-    description: Whether this network is shared across all tenants.
-    type: boolean
-  {{network.name}}NetName:
-    default: {{network.name_lower}}
-    description: The name of the {{network.name_lower}} network.
-    type: string
-  {{network.name}}SubnetName:
-    default: {{network.name_lower}}_subnet
-    description: The name of the {{network.name_lower}} subnet in Neutron.
-    type: string
-  {{network.name}}AllocationPools:
-    default: {{network.allocation_pools|default([])}}
-    description: Ip allocation pool range for the {{network.name_lower}} network.
-    type: json
-  {{network.name}}InterfaceDefaultRoute:
-    default: {{network.gateway_ip|default('""')}}
-    description: default route for the {{network.name_lower}} network
-    type: string
-{%- if network.vlan %}
-  {{network.name}}NetworkVlanID:
-    default: {{network.vlan}}
-    description: Vlan ID for the {{network.name}} network traffic.
-    type: number
-{%- endif %}
-{%- if network.ipv6 %}
-  IPv6AddressMode:
-    default: dhcpv6-stateful
-    description: Neutron subnet IPv6 address mode
-    type: string
-  IPv6RAMode:
-    default: dhcpv6-stateful
-    description: Neutron subnet IPv6 router advertisement mode
-    type: string
-{%- endif %}
-
-resources:
-  {{network.name}}Network:
-    type: OS::Neutron::Net
-    properties:
-      admin_state_up: {get_param: {{network.name}}NetAdminStateUp}
-      name: {get_param: {{network.name}}NetName}
-      shared: {get_param: {{network.name}}NetShared}
-      value_specs: {get_param: {{network.name}}NetValueSpecs}
-
-  {{network.name}}Subnet:
-    type: OS::Neutron::Subnet
-    properties:
-      cidr: {get_param: {{network.name}}NetCidr}
-      name: {get_param: {{network.name}}SubnetName}
-      network: {get_resource: {{network.name}}Network}
-      allocation_pools: {get_param: {{network.name}}AllocationPools}
-      gateway_ip: {get_param: {{network.name}}InterfaceDefaultRoute}
-{%-  if network.ipv6 %}
-      ip_version: 6
-      ipv6_address_mode: {get_param: IPv6AddressMode}
-      ipv6_ra_mode: {get_param: IPv6RAMode}
-{%- else %}
-      enable_dhcp: {get_param: {{network.name}}NetEnableDHCP}
-{%- endif %}
-
-outputs:
-  OS::stack_id:
-    description: {{network.name_lower}} network
-    value: {get_resource: {{network.name}}Network}
-  subnet_cidr:
-    value: {get_attr: [{{network.name}}Subnet, cidr]}
+{% include 'network.j2' %}
diff --git a/network/network_v6.network.j2.yaml b/network/network_v6.network.j2.yaml
new file mode 100644
index 00000000..809d145c
--- /dev/null
+++ b/network/network_v6.network.j2.yaml
@@ -0,0 +1,2 @@
+{% set ipv6_override = true -%}
+{% include 'network.j2' %}
diff --git a/network/storage_mgmt_v6.yaml b/network/storage_mgmt_v6.yaml
deleted file mode 100644
index 7ed4c92e..00000000
--- a/network/storage_mgmt_v6.yaml
+++ /dev/null
@@ -1,72 +0,0 @@
-heat_template_version: pike
-
-description: >
-  Storage management network. Storage replication, etc.
-
-parameters:
-  # the defaults here work for static IP assignment (IPAM) only
-  StorageMgmtNetCidr:
-    # OpenStack uses the EUI-64 address format, which requires a /64 prefix
-    default: 'fd00:fd00:fd00:4000::/64'
-    description: Cidr for the storage_mgmt network.
-    type: string
-  StorageMgmtNetValueSpecs:
-    default: {'provider:physical_network': 'storage_mgmt', 'provider:network_type': 'flat'}
-    description: Value specs for the storage_mgmt network.
-    type: json
-  StorageMgmtNetAdminStateUp:
-    default: false
-    description: The admin state of the network.
-    type: boolean
-  StorageMgmtNetShared:
-    default: false
-    description: Whether this network is shared across all tenants.
-    type: boolean
-  StorageMgmtNetName:
-    default: storage_mgmt
-    description: The name of the storage_mgmt network.
-    type: string
-  StorageMgmtSubnetName:
-    default: storage_mgmt_subnet
-    description: The name of the storage_mgmt subnet in Neutron.
-    type: string
-  StorageMgmtAllocationPools:
-    default: [{'start': 'fd00:fd00:fd00:4000::10', 'end': 'fd00:fd00:fd00:4000:ffff:ffff:ffff:fffe'}]
-    description: Ip allocation pool range for the storage_mgmt network.
-    type: json
-  IPv6AddressMode:
-    default: dhcpv6-stateful
-    description: Neutron subnet IPv6 address mode
-    type: string
-  IPv6RAMode:
-    default: dhcpv6-stateful
-    description: Neutron subnet IPv6 router advertisement mode
-    type: string
-
-resources:
-  StorageMgmtNetwork:
-    type: OS::Neutron::Net
-    properties:
-      admin_state_up: {get_param: StorageMgmtNetAdminStateUp}
-      name: {get_param: StorageMgmtNetName}
-      shared: {get_param: StorageMgmtNetShared}
-      value_specs: {get_param: StorageMgmtNetValueSpecs}
-
-  StorageMgmtSubnet:
-    type: OS::Neutron::Subnet
-    properties:
-      ip_version: 6
-      ipv6_address_mode: {get_param: IPv6AddressMode}
-      ipv6_ra_mode: {get_param: IPv6RAMode}
-      cidr: {get_param: StorageMgmtNetCidr}
-      name: {get_param: StorageMgmtSubnetName}
-      network: {get_resource: StorageMgmtNetwork}
-      allocation_pools: {get_param: StorageMgmtAllocationPools}
-      gateway_ip: null
-
-outputs:
-  OS::stack_id:
-    description: Neutron storage management network
-    value: {get_resource: StorageMgmtNetwork}
-  subnet_cidr:
-    value: {get_attr: [StorageMgmtSubnet, cidr]}
diff --git a/network/storage_v6.yaml b/network/storage_v6.yaml
deleted file mode 100644
index 51edd4b3..00000000
--- a/network/storage_v6.yaml
+++ /dev/null
@@ -1,72 +0,0 @@
-heat_template_version: pike
-
-description: >
-  Storage network.
-
-parameters:
-  # the defaults here work for static IP assignment (IPAM) only
-  StorageNetCidr:
-    # OpenStack uses the EUI-64 address format, which requires a /64 prefix
-    default: 'fd00:fd00:fd00:3000::/64'
-    description: Cidr for the storage network.
-    type: string
-  StorageNetValueSpecs:
-    default: {'provider:physical_network': 'storage', 'provider:network_type': 'flat'}
-    description: Value specs for the storage network.
-    type: json
-  StorageNetAdminStateUp:
-    default: false
-    description: The admin state of the network.
-    type: boolean
-  StorageNetShared:
-    default: false
-    description: Whether this network is shared across all tenants.
-    type: boolean
-  StorageNetName:
-    default: storage
-    description: The name of the storage network.
-    type: string
-  StorageSubnetName:
-    default: storage_subnet
-    description: The name of the storage subnet in Neutron.
-    type: string
-  StorageAllocationPools:
-    default: [{'start': 'fd00:fd00:fd00:3000::10', 'end': 'fd00:fd00:fd00:3000:ffff:ffff:ffff:fffe'}]
-    description: Ip allocation pool range for the storage network.
-    type: json
-  IPv6AddressMode:
-    default: dhcpv6-stateful
-    description: Neutron subnet IPv6 address mode
-    type: string
-  IPv6RAMode:
-    default: dhcpv6-stateful
-    description: Neutron subnet IPv6 router advertisement mode
-    type: string
-
-resources:
-  StorageNetwork:
-    type: OS::Neutron::Net
-    properties:
-      admin_state_up: {get_param: StorageNetAdminStateUp}
-      name: {get_param: StorageNetName}
-      shared: {get_param: StorageNetShared}
-      value_specs: {get_param: StorageNetValueSpecs}
-
-  StorageSubnet:
-    type: OS::Neutron::Subnet
-    properties:
-      ip_version: 6
-      ipv6_address_mode: {get_param: IPv6AddressMode}
-      ipv6_ra_mode: {get_param: IPv6RAMode}
-      cidr: {get_param: StorageNetCidr}
-      name: {get_param: StorageSubnetName}
-      network: {get_resource: StorageNetwork}
-      allocation_pools: {get_param: StorageAllocationPools}
-      gateway_ip: null
-
-outputs:
-  OS::stack_id:
-    description: Neutron storage network
-    value: {get_resource: StorageNetwork}
-  subnet_cidr:
-    value: {get_attr: [StorageSubnet, cidr]}
diff --git a/network/tenant_v6.yaml b/network/tenant_v6.yaml
deleted file mode 100644
index 9f139cb1..00000000
--- a/network/tenant_v6.yaml
+++ /dev/null
@@ -1,72 +0,0 @@
-heat_template_version: pike
-
-description: >
-  Tenant IPv6 network.
-
-parameters:
-  # the defaults here work for static IP assignment (IPAM) only
-  TenantNetCidr:
-    # OpenStack uses the EUI-64 address format, which requires a /64 prefix
-    default: 'fd00:fd00:fd00:5000::/64'
-    description: Cidr for the tenant network.
-    type: string
-  TenantNetValueSpecs:
-    default: {'provider:physical_network': 'tenant', 'provider:network_type': 'flat'}
-    description: Value specs for the tenant network.
-    type: json
-  TenantNetAdminStateUp:
-    default: false
-    description: The admin state of the network.
-    type: boolean
-  TenantNetShared:
-    default: false
-    description: Whether this network is shared across all tenants.
-    type: boolean
-  TenantNetName:
-    default: tenant
-    description: The name of the tenant network.
-    type: string
-  TenantSubnetName:
-    default: tenant_subnet
-    description: The name of the tenant subnet in Neutron.
-    type: string
-  TenantAllocationPools:
-    default: [{'start': 'fd00:fd00:fd00:5000::10', 'end': 'fd00:fd00:fd00:5000:ffff:ffff:ffff:fffe'}]
-    description: Ip allocation pool range for the tenant network.
-    type: json
-  IPv6AddressMode:
-    default: dhcpv6-stateful
-    description: Neutron subnet IPv6 address mode
-    type: string
-  IPv6RAMode:
-    default: dhcpv6-stateful
-    description: Neutron subnet IPv6 router advertisement mode
-    type: string
-
-resources:
-  TenantNetwork:
-    type: OS::Neutron::Net
-    properties:
-      admin_state_up: {get_param: TenantNetAdminStateUp}
-      name: {get_param: TenantNetName}
-      shared: {get_param: TenantNetShared}
-      value_specs: {get_param: TenantNetValueSpecs}
-
-  TenantSubnet:
-    type: OS::Neutron::Subnet
-    properties:
-      ip_version: 6
-      ipv6_address_mode: {get_param: IPv6AddressMode}
-      ipv6_ra_mode: {get_param: IPv6RAMode}
-      cidr: {get_param: TenantNetCidr}
-      name: {get_param: TenantSubnetName}
-      network: {get_resource: TenantNetwork}
-      allocation_pools: {get_param: TenantAllocationPools}
-      gateway_ip: null
-
-outputs:
-  OS::stack_id:
-    description: Neutron tenant network
-    value: {get_resource: TenantNetwork}
-  subnet_cidr:
-    value: {get_attr: [TenantSubnet, cidr]}
diff --git a/network_data.yaml b/network_data.yaml
index 6ad37dfe..fed11576 100644
--- a/network_data.yaml
+++ b/network_data.yaml
@@ -6,19 +6,22 @@
 # name_lower: lowercase version of name used for filenames
 #             (optional, defaults to name.lower())
 # enabled: Is the network enabled (optional, defaults to true)
-# ipv6: Does this network use IPv6 IPs? (optional, defaults to false)
-#                   (optional, may use parameter defaults in environment to set)
 # vlan: vlan for the network (optional)
 # vip: Enable creation of a virtual IP on this network
-#      [TODO] (dsneddon@redhat.com) - Enable dynamic creation of VIP ports,
-#      to support VIPs on non-default networks.
-#      See https://bugs.launchpad.net/tripleo/+bug/1667104
-# ip_subnet: IP/CIDR, e.g. '192.168.24.0/24' (optional, may use parameter defaults)
-# allocation_pools: IP range list e.g. [{'start':'10.0.0.4', 'end':'10.0.0.250}]
+# ip_subnet: IP/CIDR, e.g. '192.168.24.0/24' or '2001:db8:fd00:1000::/64'
+#            (optional, may use parameter defaults instead)
+# allocation_pools: IP range list e.g. [{'start':'10.0.0.4', 'end':'10.0.0.250'}]
 # gateway_ip: gateway for the network (optional, may use parameter defaults)
-# NOTE: IP-related values set parameter defaults in templates, may be overridden.
-# compat_name: for existing stack you may need to override the default transformation
-#              for the resource's name.
+# ipv6_subnet: Optional, sets default IPv6 subnet if IPv4 is already defined.
+# ipv6_allocation_pools: Set default IPv6 allocation pools if IPv4 allocation pools
+#                        are already defined.
+# ipv6_gateway: Set an IPv6 gateway if IPv4 gateway already defined.
+# ipv6: If ip_subnet not defined, this specifies that the network is IPv6-only.
+# NOTE: IP-related values set parameter defaults in templates, may be overridden,
+# either by operators, or e.g in environments/network-isolation-v6.yaml where we
+# set some default IPv6 addresses.
+# compat_name: for existing stack you may need to override the default
+#              transformation for the resource's name.
 #
 # Example:
 # - name Example
@@ -27,8 +30,17 @@
 #   allocation_pools: [{'start': '10.0.2.4', 'end': '10.0.2.250'}]
 #   gateway_ip: '10.0.2.254'
 #
-# TODO (dsneddon) remove existing templates from j2_excludes.yaml
-#                 and generate all templates dynamically.
+# To support backward compatility, two versions of the network definitions will
+# be created, network/<network>.yaml and network/<network>_v6.yaml. Only
+# one of these files may be used in the deployment at a time, since the
+# parameters used for configuration are the same in both files. In the
+# future, this behavior may be changed to create only one file for custom
+# networks. You may specify IPv6 addresses for ip_subnet, allocation_pools,
+# and gateway_ip if no IPv4 addresses are used for a custom network, or set
+# ipv6: true, and the network/<network>.yaml file will be configured as IPv6.
+#
+# For configuring both IPv4 and IPv6 on the same interface, use two separate
+# networks, and then assign both IPs in the custom NIC configuration templates.
 
 - name: External
   vip: true
@@ -36,27 +48,38 @@
   ip_subnet: '10.0.0.0/24'
   allocation_pools: [{'start': '10.0.0.4', 'end': '10.0.0.250'}]
   gateway_ip: '10.0.0.1'
+  ipv6_subnet: '2001:db8:fd00:1000::/64'
+  ipv6_allocation_pools: [{'start': '2001:db8:fd00:1000::10', 'end': '2001:db8:fd00:1000:ffff:ffff:ffff:fffe'}]
+  gateway_ipv6: '2001:db8:fd00:1000::1'
 - name: InternalApi
   name_lower: internal_api
   vip: true
   ip_subnet: '172.16.2.0/24'
   allocation_pools: [{'start': '172.16.2.4', 'end': '172.16.2.250'}]
+  ipv6_subnet: 'fd00:fd00:fd00:2000::/64'
+  ipv6_allocation_pools: [{'start': 'fd00:fd00:fd00:2000::10', 'end': 'fd00:fd00:fd00:2000:ffff:ffff:ffff:fffe'}]
   compat_name: Internal
 - name: Storage
   vip: true
   name_lower: storage
   ip_subnet: '172.16.1.0/24'
   allocation_pools: [{'start': '172.16.1.4', 'end': '172.16.1.250'}]
+  ipv6_subnet: 'fd00:fd00:fd00:3000::/64'
+  ipv6_allocation_pools: [{'start': 'fd00:fd00:fd00:3000::10', 'end': 'fd00:fd00:fd00:3000:ffff:ffff:ffff:fffe'}]
 - name: StorageMgmt
   name_lower: storage_mgmt
   vip: true
   ip_subnet: '172.16.3.0/24'
   allocation_pools: [{'start': '172.16.3.4', 'end': '172.16.3.250'}]
+  ipv6_subnet: 'fd00:fd00:fd00:4000::/64'
+  ipv6_allocation_pools: [{'start': 'fd00:fd00:fd00:4000::10', 'end': 'fd00:fd00:fd00:4000:ffff:ffff:ffff:fffe'}]
 - name: Tenant
   vip: false  # Tenant network does not use VIPs
   name_lower: tenant
   ip_subnet: '172.16.0.0/24'
   allocation_pools: [{'start': '172.16.0.4', 'end': '172.16.0.250'}]
+  ipv6_subnet: 'fd00:fd00:fd00:5000::/64'
+  ipv6_allocation_pools: [{'start': 'fd00:fd00:fd00:5000::10', 'end': 'fd00:fd00:fd00:5000:ffff:ffff:ffff:fffe'}]
 - name: Management
   # Management network is disabled by default
   enabled: false
@@ -64,3 +87,5 @@
   name_lower: management
   ip_subnet: '10.0.1.0/24'
   allocation_pools: [{'start': '10.0.1.4', 'end': '10.0.1.250'}]
+  ipv6_subnet: 'fd00:fd00:fd00:6000::/64'
+  ipv6_allocation_pools: [{'start': 'fd00:fd00:fd00:6000::10', 'end': 'fd00:fd00:fd00:6000:ffff:ffff:ffff:fffe'}]
diff --git a/releasenotes/notes/ipv6_defaults-7dbb62113f4e5084.yaml b/releasenotes/notes/ipv6_defaults-7dbb62113f4e5084.yaml
new file mode 100644
index 00000000..bbc67563
--- /dev/null
+++ b/releasenotes/notes/ipv6_defaults-7dbb62113f4e5084.yaml
@@ -0,0 +1,10 @@
+---
+other:
+  - |
+    Network templates are now rendered with jinja2 based on network_data.yaml.
+    The only required parameter for each network is the name, optional params
+    will populate the defaults in the network template. Network templates
+    will be generated for both IPv4 and IPv6 versions of the networks, setting
+    ipv6: true on the network will generate only IPv6 templates. An example for
+    overriding default IP addresses for IPv6 has been added in
+    environments/network-environment-v6.yaml.