[ 2140.303572][ T7499] br0: port 1(dummy0) entered blocking state
[ 2140.303780][ T7499] br0: port 1(dummy0) entered disabled state
[ 2140.303958][ T7499] dummy0: entered allmulticast mode
[ 2140.304875][ T7499] dummy0: entered promiscuous mode
[ 2140.328530][ T7500] br0: port 1(dummy0) entered blocking state
[ 2140.328903][ T7500] br0: port 1(dummy0) entered forwarding state
[ 2142.579164][   T12] dummy0: left allmulticast mode
[ 2142.579364][   T12] dummy0: left promiscuous mode
[ 2142.579587][   T12] br0: port 1(dummy0) entered disabled state