S7602-S交换机OLT单板下联ET354,display interface Onu 查看对应端口有大量intput/output errors持续增长

设备上通过命令display interface Onu 查看对应端口有大量intput/output errors持续增长

display interface Onu 1/6/0/7:1

Onu1/6/0/7:1

Current state: UP

IP packet frame type: Ethernet II, hardware address: 84d9-31e6-ac00

Description: Onu1/6/0/7:1 Interface

Maximum frame length: 1500

Loopback is not set

Port hardware type is Unknown

Broadcast max-ratio: 100%

Multicast max-ratio: 100%

Unicast max-ratio: 100%

PVID: 1

Port link-type: Access

 Tagged VLANs:   None

 Untagged VLANs: 1

Last clearing of counters: Never

 Last 300 seconds input: - packets/sec - bytes/sec -%

 Last 300 seconds output: - packets/sec - bytes/sec -%

 Input (total):  14366 packets, 2602938 bytes

         100 unicasts, 0 broadcasts, 14266 multicasts, - pauses

 Input (normal):  - packets, - bytes

         - unicasts, - broadcasts, - multicasts, - pauses

 Input:  100 input errors, 0 runts, 100 giants, - throttles

         0 CRC, - frame, - overruns, 0 aborts

         - ignored, - parity errors

 Output (total): 10343 packets, 1961012 bytes

         800 unicasts, 0 broadcasts, 9543 multicasts, - pauses

 Output (normal): - packets, - bytes

         - unicasts, - broadcasts, - multicasts, - pauses

 Output: 700 output errors, - underruns, - buffer failures

         0 aborts, - deferred, - collisions, - late collisions

         - lost carrier, - no carrier

 Input方向的 100 input errors 与接口Input方向的100 giants 增长速度和数量一致，经确认，ET354芯片有限制，会将大于1500Byte的报文识别成gints报文（gints代表超大帧，是指有效长度大于端口允许通过最大报文长度的帧），这样端口转发大于1500Byte的报文时intput/output会产生errors计数。实际小于2030Byte的报文端口都可以正常转发，该计数不影响业务。

芯片限制，硬件计数器就将 > 1500Byte 的报文作为 iant 报文，产生对应error计数，不影响转发。