华为交换机has turned into DOWN state.has turned into UP state.

Question

交换机端口不断的UPDOWN，换过交换机，换过网线，还是出现这种情况，而且多个交换机端口发生，请高手指出什么问题，谢谢！交换机日记如下
May 11 2017 12:52:15 LY-4F-2-06 %%01IFPDT/4/IF_STATE(l)[349]:Interface GigabitEthernet0/0/42 has turned into DOWN state.
May 11 2017 12:52:04 LY-4F-2-06 %%01IFPDT/4/IF_STATE(l)[350]:Interface GigabitEthernet0/0/42 has turned into UP state.
May 11 2017 12:51:59 LY-4F-2-06 %%01IFPDT/4/IF_STATE(l)[351]:Interface GigabitEthernet0/0/42 has turned into DOWN state.
May 11 2017 12:51:19 LY-4F-2-06 %%01IFPDT/4/IF_STATE(l)[352]:Interface GigabitEthernet0/0/42 has turned into UP state.
May 11 2017 12:51:14 LY-4F-2-06 %%01IFPDT/4/IF_STATE(l)[353]:Interface GigabitEthernet0/0/42 has turned into DOWN state.
May 11 2017 12:51:14 LY-4F-2-06 %%01IFPDT/4/IF_STATE(l)[354]:Interface GigabitEthernet0/0/42 has turned into UP state.
May 11 2017 12:51:10 LY-4F-2-06 %%01IFPDT/4/IF_STATE(l)[355]:Interface GigabitEthernet0/0/42 has turned into DOWN state.
May 11 2017 12:51:01 LY-4F-2-06 %%01IFPDT/4/IF_STATE(l)[356]:Interface GigabitEthernet0/0/42 has turned into UP state.
May 11 2017 12:50:52 LY-4F-2-06 %%01IFPDT/4/IF_STATE(l)[357]:Interface GigabitEthernet0/0/42 has turned into DOWN state.
May 11 2017 12:49:57 LY-4F-2-06 %%01IFPDT/4/IF_STATE(l)[358]:Interface GigabitEthernet0/0/28 has turned into UP state.
May 11 2017 12:49:52 LY-4F-2-06 %%01IFPDT/4/IF_STATE(l)[359]:Interface GigabitEthernet0/0/28 has turned into DOWN state.
May 11 2017 12:49:36 LY-4F-2-06 %%01IFPDT/4/IF_STATE(l)[360]:Interface GigabitEthernet0/0/28 has turned into UP state.
May 11 2017 12:49:32 LY-4F-2-06 %%01IFPDT/4/IF_STATE(l)[361]:Interface GigabitEthernet0/0/28 has turned into DOWN state.
May 11 2017 12:38:15 LY-4F-2-06 %%01IFPDT/4/IF_STATE(l)[362]:Interface GigabitEthernet0/0/39 has turned into UP state.
May 11 2017 12:38:11 LY-4F-2-06 %%01IFPDT/4/IF_STATE(l)[363]:Interface GigabitEthernet0/0/39 has turned into DOWN state.
May 11 2017 12:35:22 LY-4F-2-06 %%01IFPDT/4/IF_STATE(l)[364]:Interface GigabitEthernet0/0/42 has turned into UP state.
May 11 2017 12:35:18 LY-4F-2-06 %%01IFPDT/4/IF_STATE(l)[365]:Interface GigabitEthernet0/0/42 has turned into DOWN state.
May 11 2017 12:34:52 LY-4F-2-06 %%01IFPDT/4/IF_STATE(l)[366]:Interface GigabitEthernet0/0/42 has turned into UP state.
May 11 2017 12:34:48 LY-4F-2-06 %%01IFPDT/4/IF_STATE(l)[367]:Interface GigabitEthernet0/0/42 has turned into DOWN state.

Answer 1

你好，从告警来看主要两个问题：
1.G0/0/19频繁UP/DOWN
2.网络中发往交换机处理的协议报文超出限定值丢弃
从结果来看全部业务中断且中断时间和G0/0/19大致相当，估计故障原因为第一点。
如果单纯G0/0/19中断是不会影响全业务的，估计为G0/0/19下出现间歇性环路导致MAC地址漂移
具体为什么出现环路从描述看不出来，＂3台IPC直接网线接入5300(G0/0/19)＂怎么接的