Comment 4 for bug 1085823

> The topology of the test lab might be the problem here.

That's possible but don't forget that the nodes need to be able to register themselves (and thus contact the region controller); so the network of the "separate" nodes (i.e. the nodes on the separate cluster) have to be connected to the region controller one way or another. I'd appreciate if you could look into it and bring a fresh point of view on this.