vxlan interfaces fail the interface mismatch check at boot.
vxlans are not excluded from the list of interfaces to check like other sub-interface types so it fails:
Warning: Configuration references interfaces that do not exist: vxlan0 Network interface mismatch -- Running interface assignment option. vtnet0: link state changed to UP vtnet1: link state changed to UP Valid interfaces are: vtnet0 1a:f0:2c:1a:20:ae (up) VirtIO Networking Adapter vtnet1 76:2c:71:97:db:70 (up) VirtIO Networking Adapter
vxlans need to be added here: