[root@knl-f2 network-scripts]# brctl delif virbr0 virbr0-nic
[root@knl-f2 network-scripts]# brctl delbr virbr0
bridge virbr0 is still up; can't delete it
[root@knl-f2 network-scripts]# ifconfig virbr0 down
[root@knl-f2 network-scripts]# brctl delbr virbr0
[root@knl-f2 network-scripts]#