[ 1903.093860] br0: port 1(dummy0) entered blocking state
[ 1903.093939] br0: port 1(dummy0) entered disabled state
[ 1903.094009] dummy0: entered allmulticast mode
[ 1903.094097] dummy0: entered promiscuous mode
[ 1903.098604] br0: port 1(dummy0) entered blocking state
[ 1903.098652] br0: port 1(dummy0) entered forwarding state
[ 1903.384640] dummy0: left allmulticast mode
[ 1903.384681] dummy0: left promiscuous mode
[ 1903.384724] br0: port 1(dummy0) entered disabled state