Transparent bridge, trunk, router on stick, and VLAN are the major methods of interconnecting 2-layer switch and 3-layer switches, but this interconnecting depends on whether they conform identical standard or not.
一般的 2层交换机与 3层交换机之间的互联可通过桥接、中继、单臂路由及VLAN等方式 ,这基于一个前提就是它们都支持同一的标准 。