[ 1902.030536][T18672] br0: port 1(dummy0) entered blocking state
[ 1902.030725][T18672] br0: port 1(dummy0) entered disabled state
[ 1902.030893][T18672] dummy0: entered allmulticast mode
[ 1902.031816][T18672] dummy0: entered promiscuous mode
[ 1902.068452][T18673] br0: port 1(dummy0) entered blocking state
[ 1902.068743][T18673] br0: port 1(dummy0) entered forwarding state
[ 1904.028243][   T12] dummy0: left allmulticast mode
[ 1904.029235][   T12] dummy0: left promiscuous mode
[ 1904.029523][   T12] br0: port 1(dummy0) entered disabled state