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通过对现有的三类在ＡＴＭ主干网络环境中局域网互连的技术——局域网仿真、ＩＰＯｖｅｒＡＴＭ和ＭＰＯＡ进行分析和比较，给出了它们在具体应用上的特点，由此给出第三层交换技术的实现原理．通过对现有产品技术的比较，指出了第三层交换技术的关键．由于路由器在高速网络环境下的瓶颈效应十分明显，因此在ＡＴＭ网络环境下应尽量避免使用．ＭＰＯＡ将路由功能从传统的路由器中分类出来，独立用硬件进行实现，从而大大减少了由此引起的性能下降．目前，第三层交换技术采用了同样的技术路线，用于提高网络的整体性能．
By analyzing and comparing the existing three types of LAN interconnection technologies in the ATM backbone network environment - LAN emulation, IPOverATM and MPOA, and given their specific application characteristics, which gives the third layer of exchange Technology implementation principle. By comparing the existing product technology, pointed out that the third layer of the key exchange technology. As the bottleneck effect of routers in high-speed network environment is obvious, ATM network environment should be avoided as much as possible. MPOA categorizes routing functions from traditional routers and implements them separately in hardware, greatly reducing the resulting performance degradation. Currently, the third layer of switching technology uses the same technical route used to improve the overall network performance.