Nexus 93180YC-EX 能检测到 25G SFP28 DAC 和光模块,但链路始终起不来

发帖人是一台运行 NX-OS 7.0(3)I4(7) 的 Cisco Nexus 93180YC-EX 的新用户,任何 25G 链路都起不来。ipolex 的 SFP28 DAC 线缆能被识别('type is SFP-H25GB-CU1M'、'name is OEM'、'part number is SFP-H25G-CU1M'、'nominal bitrate is 25500 MBit/sec'、'DOM is not supported'),但即使执行了 'service unsupported-transceiver',端口依然是 down。用跳线测试光模块得到了不对称的结果:服务器端插 25G SFP、交换机端插 10G SFP,能以 10G 起链路;而服务器端插 10G SFP、交换机端插 CISCO-FINISAR SFP-25G-SR-S(型号 SFP-H25GB-SR10M,部件号 AZS85-S28-M1/GR,思科部件号 10-3227-01),链路始终不通,尽管 'show interface transceiver detail' 显示 DOM 数值健康(Tx 1.19 dBm,Rx 0.56 dBm,Transmit Fault Count = 0)。Eth1/30 和 Eth1/31 的配置完全一致。

• 硬件: Cisco Nexus 93180YC-EX
• 收发器: ipolex 25G SFP28 DAC(识别为 SFP-H25GB-CU1M / SFP-H25G-CU1M)、SFP-25G-SR-S(CISCO-FINISAR AZS85-S28-M1/GR)、型号未说明的 10G SFP+
• 封装形式: SFP28、DAC、SFP+

症状/报错信息:

link down with 25G SFP28 DAC recognized as SFP-H25GB-CU1M
DOM is not supported
service unsupported-transceiver has no effect
10G SFP+ to SFP-25G-SR-S optical link stays down
link up at 10G only with the 10G module in the switch