Nexus 93108TC-FX3P:QSFP-100G-CU1M 的链路只有在插线缆之前先设好速率才能起来

两台运行 NX-OS 9.3(11) 的 Cisco Nexus 93108TC-FX3P 交换机用原厂 QSFP-100G-CU1M DAC 相连,但链路始终起不来。兼容性矩阵写明该线缆从 NX-OS 9.3.5 起支持。端口配置很简单,就是 'switchport mode trunk' / 'no shutdown',而 'show interface eth1/54 transceiver details' 也正确识别出了这根线:'type is QSFP-100G-CR4'、'name is CISCO-LEONI'、'part number is L45593-D218-D10'、'cisco product id is QSFP-100G-CU1M'、'cisco part number is 37-1666-01'、'DOM is not supported'。试过四根不同的线缆,也关闭了 FEC,均未成功。尝试手动指定端口参数时,发帖人发现线缆插着的时候,speed/duplex/negotiation 这些命令根本无法使用。

• 硬件: Cisco Nexus 93108TC-FX3P
• 收发器: QSFP-100G-CU1M(CISCO-LEONI L45593-D218-D10)
• 封装形式: QSFP28、DAC

症状/报错信息:

link down on QSFP-100G-CU1M between two Nexus 93108TC-FX3P
DOM is not supported
speed/duplex/negotiation commands not available while the cable is inserted
disabling FEC did not help