[ 2220.565370][ T9506] br0: port 1(dummy0) entered blocking state
[ 2220.565559][ T9506] br0: port 1(dummy0) entered disabled state
[ 2220.565733][ T9506] dummy0: entered allmulticast mode
[ 2220.566684][ T9506] dummy0: entered promiscuous mode
[ 2220.602252][ T9507] br0: port 1(dummy0) entered blocking state
[ 2220.602517][ T9507] br0: port 1(dummy0) entered forwarding state
[ 2222.583837][   T12] dummy0: left allmulticast mode
[ 2222.584414][   T12] dummy0: left promiscuous mode
[ 2222.584637][   T12] br0: port 1(dummy0) entered disabled state