[ 2020.324681][ T5971] br0: port 1(dummy0) entered blocking state
[ 2020.324877][ T5971] br0: port 1(dummy0) entered disabled state
[ 2020.325036][ T5971] dummy0: entered allmulticast mode
[ 2020.325976][ T5971] dummy0: entered promiscuous mode
[ 2020.359737][ T5972] br0: port 1(dummy0) entered blocking state
[ 2020.360136][ T5972] br0: port 1(dummy0) entered forwarding state
[ 2022.242466][   T12] dummy0: left allmulticast mode
[ 2022.243871][   T12] dummy0: left promiscuous mode
[ 2022.244155][   T12] br0: port 1(dummy0) entered disabled state