[ 2177.335400][ T4870] br0: port 1(dummy0) entered blocking state
[ 2177.335600][ T4870] br0: port 1(dummy0) entered disabled state
[ 2177.335783][ T4870] dummy0: entered allmulticast mode
[ 2177.337563][ T4870] dummy0: entered promiscuous mode
[ 2177.358287][ T4871] br0: port 1(dummy0) entered blocking state
[ 2177.358481][ T4871] br0: port 1(dummy0) entered forwarding state
[ 2179.450019][   T12] dummy0: left allmulticast mode
[ 2179.450185][   T12] dummy0: left promiscuous mode
[ 2179.450543][   T12] br0: port 1(dummy0) entered disabled state