I installed openstack Grizzly setup in Ubuntu 12.04LTS. Initially I faced problem with compute node which hangs when I launch the instance. Then I analysed the log which shows OVS version not supported by current kernal (2.3.0) version.So I manually installed kernal 3.5.0. Then I faced the same problem with log showing OVS version not support tunneling. So then I updated OVS version 1.4.6 to 1.10.0 
       After updating the OVS version to 1.10.0 no problem occurred during launching the instance but now the instance not getting the IP. Checking the log shows "Extension flavor not supported by any of loaded plugins".
  Also my dashboard's router details panel shows " Status DOWN" for external gateway.

can any one help me with this issue ?