[ 2189.175815][ T6939] br0: port 1(dummy0) entered blocking state
[ 2189.176151][ T6939] br0: port 1(dummy0) entered disabled state
[ 2189.176500][ T6939] dummy0: entered allmulticast mode
[ 2189.177524][ T6939] dummy0: entered promiscuous mode
[ 2189.204922][ T6940] br0: port 1(dummy0) entered blocking state
[ 2189.205218][ T6940] br0: port 1(dummy0) entered forwarding state
[ 2191.518263][   T12] dummy0: left allmulticast mode
[ 2191.518551][   T12] dummy0: left promiscuous mode
[ 2191.518862][   T12] br0: port 1(dummy0) entered disabled state