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Provider network types

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The admin tab in horizon allows the creation of Networks. In the provider_network_type there are several options: flat, vlan, vxlan so on. What setting is required to be able to create each of these network?

I followed an openstack install using the self-service networks. But when i try to create an external network in horizon with provider_type_network= vxlan, the VMs have ssh issues. However if i change the provider_network_type= flat, the ssh issues are resolved. As i followed self-service network steps for installation, i assume the creation of external network with vxlan must be allowed. Correct me if i am wrong. I just want to know in simple terms when to create these networks and how.