Juniper QFX5100交換機et接口input error及CRC/Align errors
通過命令：show interfaces et-0/0/2 extensive,顯示input error以及CRC錯誤。
狀態顯示：
Physical interface: et-0/0/2, Enabled, Physical link is Up
Interface index: 942, SNMP ifIndex: 516, Generation: 676
Link-level type: Ethernet, MTU: 1514, Speed: 40Gbps, BPDU Error: None, MAC-REWRITE Error: None, Loopback: Disabled, Source filtering: Disabled, Flow control: Disabled, Media type: Fiber
Device flags : Present Running
Interface flags: SNMP-Traps Internal: 0x4000
Link flags : None
Input errors:
Errors: 771731, Drops: 0, Framing errors: 771415, Runts: 0, Policed discards: 0, L3 incompletes: 0, L2 channel errors: 0, L2 mismatch timeouts: 0, FIFO errors: 0, Resource errors: 0
Output errors:
Carrier transitions: 3, Errors: 0, Drops: 0, Collisions: 0, Aged packets: 0, FIFO errors: 0, HS link CRC errors: 0, MTU errors: 0, Resource errors: 0
…………………………
MAC statistics: Receive Transmit
Total octets 1216533781969 1073277356863
Total packets 1669078594 1462519491
Unicast packets 1633851744 1398747806
Broadcast packets 361455 27733729
Multicast packets 34865395 36037956
CRC/Align errors 771415 0
FIFO errors 0 0
初步排查，影響的原因有可能是以下幾點：
1. 接口模塊
2. 光線或網線
3. 兩邊接口是否全雙工
解決辦法：
經換模塊，CRC顯示正常，input error恢復正常。 開Case，對模塊進行RMA處理。
Juniper QFX5100交換機et接口input error及CRC/Align errors