[ 1855.059784][  T820] br0: port 1(dummy0) entered blocking state
[ 1855.060027][  T820] br0: port 1(dummy0) entered disabled state
[ 1855.060264][  T820] dummy0: entered allmulticast mode
[ 1855.061252][  T820] dummy0: entered promiscuous mode
[ 1855.089263][  T821] br0: port 1(dummy0) entered blocking state
[ 1855.089482][  T821] br0: port 1(dummy0) entered forwarding state
[ 1856.838155][   T12] dummy0: left allmulticast mode
[ 1856.838316][   T12] dummy0: left promiscuous mode
[ 1856.838530][   T12] br0: port 1(dummy0) entered disabled state