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I think I have found the answer to this however I decided to deploy the systems with 1 network per role as per the guide. The reasons for doing so is that I want to avoid an issue in the future in case it's realised later on that I should have made them separate for any reason.

Each OpenStack service is assigned to a network using a default mapping. The service will be bound to the host IP within the named network on each host.

Note The services will be assigned to the networks according to the ServiceNetMap in overcloud.yaml. Unless these defaults need to be overridden, the ServiceNetMap does not need to be defined in the environment file.

Example:

parameter_defaults:    

  ServiceNetMap:
    NeutronTenantNetwork: tenant
    CeilometerApiNetwork: internal_api

ref: http://tripleo.org/install/advanced_deployment/network_isolation.html