[ 1667.635835][T21752] br0: port 1(dummy0) entered blocking state
[ 1667.635976][T21752] br0: port 1(dummy0) entered disabled state
[ 1667.636086][T21752] dummy0: entered allmulticast mode
[ 1667.636553][T21752] dummy0: entered promiscuous mode
[ 1667.650147][T21753] br0: port 1(dummy0) entered blocking state
[ 1667.650303][T21753] br0: port 1(dummy0) entered forwarding state
[ 1668.802269][   T12] dummy0: left allmulticast mode
[ 1668.802407][   T12] dummy0: left promiscuous mode
[ 1668.802562][   T12] br0: port 1(dummy0) entered disabled state