Well, it does work fine if forge is only on the client side but I haven't successfully been able to link a server running forge to bungeecord. When I set it up to do so, all it does is wait around trying to connect but doesn't actually connect. That same server will connect fine if I use the vanilla server jar though. I am using 1.7.10 (certain mods I'd like to use aren't up to 1.8 yet) I'll try running 1.8 forge server today and see if it connects.