今天菜鸡哥哥到核心交换发现一堆报错，如下图 思科对此官方的解释是： Error Message SW_MATM-4-MACFLAP_NOTIF: Host [enet] in [chars] [dec] is flapping between port [chars] and port [chars] 某主机的MAC地址在某两端口之间摆动。思科推荐行动是检查交换机的配置以防有数据传输环路。 Explanation This message means that the switch found the traffic from the specified host flapping between the specified ports. [enet] is the host MAC address, [chars] [dec] is the switch ID, and the first and second [chars] are the ports between which the host traffic is flapping. Recommended Action Check the network switches for misconfigurations that might cause a data-forwarding loop. 华为官方解释此地址Host 00:E0:FC:09:BC:F9为STP、loopback-detection、NDP、STDP、gratuitous-arp-learning用的组播所用的虚拟地址。 解决办法：接入层华为设备的上行口LOOPBACK-DETECTION关闭就好了。 另外对于这个问题的解释，这个链接有详细的解释 http://blog.sina.com.cn/s/blog_6a4ca2630101dbjh.html ——博主有版权问题，可以联系本人，本人将立即删除！！！