openstack how to delete network

how to delete network in Nova

root@u1204x:~# nova-manage network list
id       IPv4                  IPv6               start address      DNS1               DNS2               VlanID             project            uuid          
2012-05-08 01:52:18 DEBUG nova.utils [req-4381a60e-24f5-467e-adbb-f662de1cc713 None None] backend from (pid=6738) __get_backend /usr/lib/python2.7/dist-packages/nova/utils.py:658
1        192.168.22.32/27      None               192.168.22.34      8.8.4.4            None               None               None               c6fd11e1-101e-4e99-b256-1a842ffc10ce
root@u1204x:~#


root@u1204x:~# nova-manage network delete --uuid c6fd11e1-101e-4e99-b256-1a842ffc10ce
2012-05-08 01:57:47 DEBUG nova.utils [req-adb187d5-9eb4-41ab-80f7-4949904954bc None None] backend from (pid=7175) __get_backend /usr/lib/python2.7/dist-packages/nova/utils.py:658
root@u1204x:~#

root@u1204x:~# nova-manage network list