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局域网基础设施应解决如何通过网络边界进行数据传输的问题,即需要一种同时具有第二层交换机和局域网内外路由器的功能,并且其时延小于传统的局域网路由器的全新的设备。通常我们称之为第三层交换机。建造大型第二层网络主要是因为性能和简易性等原因,但越来越明显的是,第三层控制也是必要的。用户很清楚地看到第二层设计的弱点:广播风暴、生成树导致在数据路径使用上的低效率、对异种网络之间互联的限制、安全性等等。在数年前,这些
The LAN infrastructure should address the issue of how to transport data across network boundaries by requiring a new device that has both Layer 2 switches and internal and external LAN routers and has a latency that is less than that of traditional LAN routers. Often we call it a Layer 3 switch. Large-scale second-tier network construction is mainly due to performance and simplicity and other reasons, but it is more and more obvious that the third layer of control is also necessary. Users clearly see the second layer of design weaknesses: broadcast storms, spanning trees lead to inefficiencies in data path usage, restrictions on interconnectivity between heterogeneous networks, security and more. A few years ago, these