[ 2020.185178][T29568] br0: port 1(dummy0) entered blocking state
[ 2020.185385][T29568] br0: port 1(dummy0) entered disabled state
[ 2020.185564][T29568] dummy0: entered allmulticast mode
[ 2020.186754][T29568] dummy0: entered promiscuous mode
[ 2020.210940][T29569] br0: port 1(dummy0) entered blocking state
[ 2020.211191][T29569] br0: port 1(dummy0) entered forwarding state
[ 2022.239928][   T12] dummy0: left allmulticast mode
[ 2022.240261][   T12] dummy0: left promiscuous mode
[ 2022.241332][   T12] br0: port 1(dummy0) entered disabled state