Redundant power supplies,hot-swappable modules and Spanning Tree Protocol (STP) support are all mandatory elements of a backbone switch,as is support for emerging switch technologies,including virtual LANs.

• 具有冗余能力的电源、可热插拔的模块和对生成树协议（STP）的支持都是基干交换机必备的成分，实际上它支持新出现的交换技术，如虚拟局域网。