[ 1601.291499] br0: port 1(dummy0) entered blocking state
[ 1601.291540] br0: port 1(dummy0) entered disabled state
[ 1601.291577] dummy0: entered allmulticast mode
[ 1601.291634] dummy0: entered promiscuous mode
[ 1601.294199] br0: port 1(dummy0) entered blocking state
[ 1601.294262] br0: port 1(dummy0) entered forwarding state
[ 1601.481112] dummy0: left allmulticast mode
[ 1601.481146] dummy0: left promiscuous mode
[ 1601.481174] br0: port 1(dummy0) entered disabled state