交换机接口和vlanif接口怎么会偶尔突然down然后3秒之后UP，但是不会频繁

放通了，是电口

那可能但是链路质量不太好，可以更换线，看下接口是不是有crc

好，我display intface g1/0/10接口下面，有个 Last link flapping: 23 hours 34 minutes 2 seconds

怎么查看有没有crc？

Last link flapping: 23 hours 39 minutes48 second Last clearing of counters: Never Current system time:2024-01-29 18:10:17 Asia/Shanghai+08:00:00 Last time when physical state changed to up:2024-01-28 18:30:30 Asia/Shanghai+08:00:00 Last time when physical state changed to down:2024-01-28 18:30:26 Asia/Shanghai+08:00:00 Peak input rate: 5545097 bytes/sec, at 2024-01-04 16:42:23 Peak output rate: 17746262 bytes/sec, at 2023-12-13 03:27:42 Last 300 seconds input: 102 packets/sec 102594 bytes/sec 0% Last 300 seconds output: 42 packets/sec 20989 bytes/sec 0% Input (total): 709626529 packets, 323682779456 bytes 701329725 unicasts, 247847 broadcasts, 8047004 multicasts, 0 pauses Input (normal): 709624576 packets, - bytes 701329725 unicasts, 247847 broadcasts, 8047004 multicasts, 0 pauses Input: 1953 input errors, 0 runts, 0 giants, 0 throttles 1946 CRC, 7 frame, - overruns, 0 aborts - ignored, - parity errors Output (total): 797543653 packets, 854608690824 bytes 797380533 unicasts, 9557 broadcasts, 153563 multicasts, 0 pauses Output (normal): 797543653 packets, - bytes 797380533 unicasts, 9557 broadcasts, 153563 multicasts, 0 pauses Output: 0 output errors, - underruns, - buffer failures 0 aborts, 0 deferred, 0 collisions, 0 late collisions 0 lost carrier, - no carrier

1946 CRC,