[root@csc1s nova]# brctl show
bridge name	bridge id		STP enabled	interfaces
qbr2de1790f-6a		8000.000000000000	no
qbr5a9a56b6-8b		8000.000000000000	no
qbr6f2d66c0-34		8000.baff4a7f7e75	no		qvb6f2d66c0-34
							tap6f2d66c0-34
qbre856f4f9-fa		8000.4ed348b14099	no		qvbe856f4f9-fa
virbr0		8000.000000000000	yes