| 场景 | 链路不通、单口 down 故障 |
|---|---|
| 适用 | 全部设备 |
| 命令族 | display interface + display transceiver + display logbuffer / show interfaces + show logging / display interface + display transceiver |
华为 VRP
华为 VRP
<Huawei> display interface GigabitEthernet 0/0/1 | include current state|Line protocol
<Huawei> display transceiver interface GigabitEthernet 0/0/1
<Huawei> display transceiver diagnosis interface GigabitEthernet 0/0/1
<Huawei> display logbuffer | include IFNET思科 IOS
思科 IOS
SW-CORE-01# show interfaces status | include Gi1/0/4
SW-CORE-01# show interfaces Gi1/0/4 | include line protocol|errors
SW-CORE-01# show interfaces Gi1/0/4 transceiver detail
SW-CORE-01# show logging | include Gi1/0/4H3C Comware
H3C Comware
<H3C> display interface GigabitEthernet 1/0/4
<H3C> display transceiver interface GigabitEthernet 1/0/4
<H3C> display transceiver diagnosis interface GigabitEthernet 1/0/4
<H3C> display logbuffer | include GigabitEthernet1/0/4排查顺序建议：① 确认是否人为 shutdown（*down / administratively down）② 查光模块与收光 ③ 查日志看 up/down 历史 ④ 换跳线/换端口/换模块交叉验证 ⑤ 最后才怀疑设备单板。两端都要查：本端不 up 的常见原因在对端关端口或对端模块故障。