[ 2226.082053][ T3900] br0: port 1(dummy0) entered blocking state
[ 2226.082710][ T3900] br0: port 1(dummy0) entered disabled state
[ 2226.082874][ T3900] dummy0: entered allmulticast mode
[ 2226.083804][ T3900] dummy0: entered promiscuous mode
[ 2226.113826][ T3901] br0: port 1(dummy0) entered blocking state
[ 2226.114086][ T3901] br0: port 1(dummy0) entered forwarding state
[ 2228.058216][   T12] dummy0: left allmulticast mode
[ 2228.058896][   T12] dummy0: left promiscuous mode
[ 2228.059271][   T12] br0: port 1(dummy0) entered disabled state