When I configured VXLAN I ran into an issue where the host failed to automatically download the VXLAN VIB installation from vShield Manager.
Following these instructions resolved the issue for me:
http://vcdx56.com/2013/03/26/vxlan-vib-installation-fails/
I'm not sure if you're experiencing the same problem but it's worth a look.
Regards,
Kyle.
