[ 2019.358715][T29820] br0: port 1(dummy0) entered blocking state
[ 2019.358934][T29820] br0: port 1(dummy0) entered disabled state
[ 2019.359134][T29820] dummy0: entered allmulticast mode
[ 2019.360040][T29820] dummy0: entered promiscuous mode
[ 2019.391695][T29821] br0: port 1(dummy0) entered blocking state
[ 2019.392328][T29821] br0: port 1(dummy0) entered forwarding state
[ 2021.342509][   T12] dummy0: left allmulticast mode
[ 2021.343534][   T12] dummy0: left promiscuous mode
[ 2021.343763][   T12] br0: port 1(dummy0) entered disabled state