[ 1837.454702] br0: port 1(dummy0) entered blocking state
[ 1837.454746] br0: port 1(dummy0) entered disabled state
[ 1837.454774] dummy0: entered allmulticast mode
[ 1837.454827] dummy0: entered promiscuous mode
[ 1837.458123] br0: port 1(dummy0) entered blocking state
[ 1837.458184] br0: port 1(dummy0) entered forwarding state
[ 1837.712770] dummy0: left allmulticast mode
[ 1837.712808] dummy0: left promiscuous mode
[ 1837.712833] br0: port 1(dummy0) entered disabled state