Bug 1636632

Verified:
Environment:
os-net-config-9.2.1-0.20181008041835.bedb54a.el7ost.noarch

Successfulyl deploy overcloud while the compute yaml had 'routes: []' and looked like below:
(undercloud) [stack@undercloud-0 ~]$ cat virt/network/three-nics-vlans//compute.yaml
heat_template_version: ocata

description: >
  Software Config to drive os-net-config to configure multiple interfaces
  for the compute role.

parameters:
  ControlPlaneIp:
    default: ''
    description: IP address/subnet on the ctlplane network
    type: string
  ExternalIpSubnet:
    default: ''
    description: IP address/subnet on the external network
    type: string
  InternalApiIpSubnet:
    default: ''
    description: IP address/subnet on the internal API network
    type: string
  StorageIpSubnet:
    default: ''
    description: IP address/subnet on the storage network
    type: string
  StorageMgmtIpSubnet:
    default: ''
    description: IP address/subnet on the storage mgmt network
    type: string
  TenantIpSubnet:
    default: ''
    description: IP address/subnet on the tenant network
    type: string
  ManagementIpSubnet: # Only populated when including environments/network-management.yaml
    default: ''
    description: IP address/subnet on the management network
    type: string
  InternalApiNetworkVlanID:
    default: 20
    description: Vlan ID for the internal_api network traffic.
    type: number
  StorageNetworkVlanID:
    default: 30
    description: Vlan ID for the storage network traffic.
    type: number
  TenantNetworkVlanID:
    default: 50
    description: Vlan ID for the tenant network traffic.
    type: number
  ControlPlaneSubnetCidr: # Override this via parameter_defaults
    default: '24'
    description: The subnet CIDR of the control plane network.
    type: string
  ControlPlaneDefaultRoute: # Override this via parameter_defaults
    description: The subnet CIDR of the control plane network.
    type: string
  DnsServers: # Override this via parameter_defaults
    default: []
    description: A list of DNS servers (2 max for some implementations) that will be added to resolv.conf.
    type: json
  EC2MetadataIp: # Override this via parameter_defaults
    description: The IP address of the EC2 metadata server.
    type: string
  StorageInterfaceRoutes:
    default: []
    description: >
      Routes for the storage network traffic.
      JSON route e.g. [{'destination':'10.0.0.0/16', 'nexthop':'10.0.0.1'}]
      Unless the default is changed, the parameter is automatically resolved
      from the subnet host_routes attribute.
    type: json
  StorageMgmtInterfaceRoutes:
    default: []
    description: >
      Routes for the storage_mgmt network traffic.
      JSON route e.g. [{'destination':'10.0.0.0/16', 'nexthop':'10.0.0.1'}]
      Unless the default is changed, the parameter is automatically resolved
      from the subnet host_routes attribute.
    type: json
  InternalApiInterfaceRoutes:
    default: []
    description: >
      Routes for the internal_api network traffic.
      JSON route e.g. [{'destination':'10.0.0.0/16', 'nexthop':'10.0.0.1'}]
      Unless the default is changed, the parameter is automatically resolved
      from the subnet host_routes attribute.
    type: json
  TenantInterfaceRoutes:
    default: []
    description: >
      Routes for the tenant network traffic.
      JSON route e.g. [{'destination':'10.0.0.0/16', 'nexthop':'10.0.0.1'}]
      Unless the default is changed, the parameter is automatically resolved
      from the subnet host_routes attribute.
    type: json
  ExternalInterfaceRoutes:
    default: []
    description: >
      Routes for the external network traffic.
      JSON route e.g. [{'destination':'10.0.0.0/16', 'nexthop':'10.0.0.1'}]
      Unless the default is changed, the parameter is automatically resolved
      from the subnet host_routes attribute.
    type: json
  ManagementInterfaceRoutes:
    default: []
    description: >
      Routes for the management network traffic.
      JSON route e.g. [{'destination':'10.0.0.0/16', 'nexthop':'10.0.0.1'}]
      Unless the default is changed, the parameter is automatically resolved
      from the subnet host_routes attribute.
    type: json

resources:
  OsNetConfigImpl:
    type: OS::Heat::SoftwareConfig
    properties:
      group: script
      config:
          str_replace:
              template:
                  get_file: /usr/share/openstack-tripleo-heat-templates/network/scripts/run-os-net-config.sh
              params:
                   $network_config:
                       network_config:
                        -
                          type: interface
                          name: nic1
                          use_dhcp: false
                          dns_servers:
                              get_param: DnsServers
                          addresses:
                            -
                              ip_netmask:
                                list_join:
                                  - '/'
                                  - - get_param: ControlPlaneIp
                                    - get_param: ControlPlaneSubnetCidr
                          routes:
                            -
                              ip_netmask: 0.0.0.0/0
                              next_hop:
                                  get_param: ControlPlaneDefaultRoute

                              # Optionally have this interface as default route
                              default: true
                            -
                              ip_netmask: 169.254.169.254/32
                              next_hop:
                                  get_param: EC2MetadataIp
                        -
                          type: ovs_bridge
                          name: br-isolated
                          use_dhcp: false
                          members:
                            -
                              type: interface
                              name: nic2
                              # force the MAC address of the bridge to this interface
                              primary: true
                            -
                              type: vlan
                              vlan_id:
                                  get_param: InternalApiNetworkVlanID
                              addresses:
                              -
                                ip_netmask:
                                    get_param: InternalApiIpSubnet
                              routes: []
                            -
                              type: vlan
                              vlan_id:
                                  get_param: StorageNetworkVlanID
                              addresses:
                              -
                                ip_netmask:
                                    get_param: StorageIpSubnet
                              routes: []
                            -
                              type: vlan
                              vlan_id:
                                  get_param: TenantNetworkVlanID
                              addresses:
                              -
                                ip_netmask:
                                    get_param: TenantIpSubnet
                              routes: []
                        -
                          type: interface
                          name: nic3
                          use_dhcp: false

outputs:
  OS::stack_id:
    description: The OsNetConfigImpl resource.
    value:
        get_resource: OsNetConfigImpl

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2019:0045