Those two commands are still a bit buggy in their actions. It seems that triggering one will have the same effect as triggering the other, depending on the bridge's status. The naming scheme is also a little confusing, as people's first thoughts are that the opening command "opens" the bridge, rather than opens it to traffic as Juppi said. This bug does still need to be looked at in 0.1.0.12, as it is a little bit of an annoyance in the way it works.