In the control plane the 4over6 mechanism extends BGP-MP to carry the tunnel end information to the other side of the IPv6 backbone to setup of a stateless 4over6 tunnel on the dual-stack provider edge(PE) router.

• 在控制平面4over6机制扩展了BGP-MP协议,使它能够在IPv6主干网供应商边缘路由器(PErouter)之间传播4over6隧道端点信息,从而在IPv6主干网的供应商边缘路由器之间建立4over6自动隧道;