[ 1556.547310] br0: port 1(dummy0) entered blocking state
[ 1556.547390] br0: port 1(dummy0) entered disabled state
[ 1556.547462] dummy0: entered allmulticast mode
[ 1556.547553] dummy0: entered promiscuous mode
[ 1556.550172] br0: port 1(dummy0) entered blocking state
[ 1556.550212] br0: port 1(dummy0) entered forwarding state
[ 1556.730676] dummy0: left allmulticast mode
[ 1556.730744] dummy0: left promiscuous mode
[ 1556.730804] br0: port 1(dummy0) entered disabled state