[ 1984.448171][ T7912] br0: port 1(dummy0) entered blocking state
[ 1984.448366][ T7912] br0: port 1(dummy0) entered disabled state
[ 1984.448535][ T7912] dummy0: entered allmulticast mode
[ 1984.449397][ T7912] dummy0: entered promiscuous mode
[ 1984.478229][ T7913] br0: port 1(dummy0) entered blocking state
[ 1984.478410][ T7913] br0: port 1(dummy0) entered forwarding state
[ 1986.451715][   T12] dummy0: left allmulticast mode
[ 1986.452004][   T12] dummy0: left promiscuous mode
[ 1986.452375][   T12] br0: port 1(dummy0) entered disabled state