Changing Magnum Heat template to create node network with vxlan instead of vlan

Hello Team, I was able to deploy Openstack with Magnum and Zun enabled. Unfortunately, When I create a cluster, Heat configure the fix/_network for the nodes with Vlan and the nodes fail to get IPs. I was wondering if it is possible to trick the heat templates to create vxlan network instead of vlan. Regards Tony Karera