第三层交换是新一代局域网路由和交换技术，本书是第一本关于这种新技术的系统化指南。本书主要内容包括：如何决定是否选择第三层交换技术、第三层交换网络设计技术、第三层交换案例分析等，并对目前流行的6种第三层交换产品给出了基准测试结果。最后，针对具体实施，为第三层交换的管理给出了一些推荐意见。-Layer 3 Switching is a new generation LAN routing and switching technology, This book is the first of this new technology systematic guide. The main contents of this book include : how to decide whether to choose the third layer switching technology, the third layer switching network design technology, Layer 3 Switching case analysis, and the popular six third layer switching products is a benchmark test results. Finally, the specific implementation of the third layer is the management of the exchange of views for some recommendations.