端口二层相关功能支持FlexLink备份链路快速汇聚(汇聚时间不超过100毫秒)支持端口单通链路检测(Unidirectional link detection)，以避免单同链路可能导致的spanning tree loops问题支持SPAN本交换机端口镜像和RSPAN跨交换机端口镜像支持DHCP server和DHCP Re...
abstract:Unidirectional Link Detection (UDLD) is a data link layer protocol from Cisco Systems to monitor the physical configuration of the cables and detect unidirectional links. UDLD complements the Spanning Tree Protocol which is used to eliminate switching loops.