| 场景 | 丢包/重传定位、链路质量治理 |
|---|---|
| 适用 | 全部设备 |
| 命令族 | display interface | include CRC / show interfaces | include CRC / display interface | include CRC |
华为 VRP
华为 VRP
<Huawei> display interface GigabitEthernet 0/0/1 | include CRC|error
! 观察：CRC 计数是否持续增长
[Huawei] display logbuffer | include CRC ! 部分平台有 CRC 告警日志思科 IOS
思科 IOS
SW-CORE-01# show interfaces GigabitEthernet1/0/1 | include CRC|input errors
SW-CORE-01# show interfaces counters errors | include Gi1/0/1
! FCS-Err 增长 = 物理层错帧H3C Comware
H3C Comware
<H3C> display interface GigabitEthernet 1/0/1 | include CRC|error
! Comware 界面显示 CRC 错误计数与接收方向错误
<H3C> display logbuffer | include CRC定位顺序：换线缆 → 换端口 → 换模块 → 清洁光纤端面 → 检查电磁环境与接地 → 确认双工匹配。CRC 只在单方向增长时，问题几乎总在该方向的线缆/模块/端口。