二层转发 meaning in English

layer forwarding

It has the advantages of delivering routes between the layer 3 which are connectionless and the layer 2 which are connection - oriented . through constant research and countless experiments , the method of seamless integration with customer intranets has been found out , so that we only buy the customer equipment once , and the upgrade of the network only needs to modify the configurations but not needs to change the consumer equipment
Mpls改进了专线组网的缺点,兼有无连接的第三层路由和面向连接的第二层转发的优点,通过研究和不断实验,找到了用户内部网无缝集成的方法,从而使用户端的设备投入一次到位,网络升级只需修改一下配置,用户端硬件不用做任何改动。