故障现象:CiscoIP phone 7911,显示以太网未连接,查看了交换机口1/0/8。我排除了网线,模块,配置的问题。把7911话机直连交换机接口测试。测试一:连接1/0/8,话机仍显示以太网未连接,接口灯不亮,交换机显示nonotconnect,日志显示%SWITCH_QOS_TB-5-TRUST_DEVICE_LOST: cisco-phone no longer detected on port Fa1/0/8, operational port trust state is now...