华为交换机端口环回检测，问题分析。

Question

Sep 3 2008 13:15:05-05:13 304-1-SW3-voice %%01IFNET/4/IF_STATE(l)[325]:Interface Ethernet0/0/47 has turned into UP state.
Sep 3 2008 13:15:01-05:13 304-1-SW3-voice %%01IFNET/4/IF_STATE(l)[326]:Interface Ethernet0/0/47 has turned into DOWN state.
Sep 3 2008 13:14:58-05:13 304-1-SW3-voice %%01IFNET/4/IF_STATE(l)[327]:Interface Ethernet0/0/47 has turned into UP state.
Sep 3 2008 13:14:53-05:13 304-1-SW3-voice %%01IFNET/4/IF_STATE(l)[328]:Interface Ethernet0/0/47 has turned into DOWN state.
Sep 3 2008 13:14:46-05:13 304-1-SW3-voice %%01IFNET/4/IF_STATE(l)[329]:Interface Ethernet0/0/47 has turned into UP state.
Sep 3 2008 13:14:44-05:13 304-1-SW3-voice %%01IFNET/4/IF_STATE(l)[330]:Interface Ethernet0/0/47 has turned into DOWN state.
Sep 3 2008 13:14:43-05:13 304-1-SW3-voice %%01IFNET/4/IF_STATE(l)[331]:Interface Ethernet0/0/47 has turned into UP state.
Sep 3 2008 13:14:34-05:13 304-1-SW3-voice %%01IFNET/4/IF_STATE(l)[332]:Interface Ethernet0/0/47 has turned into DOWN state.
一旦发现问题就会出现这种日志，不一定是这个端口哈，每个端口都有可能。应该就是环回检测造成的，我的环回检测是这样的，

loopback-detect recovery-time 2
loopback-detect packet vlan 1
loopback-detect enable
loopback-detect action shutdown
有没有人知道这是为什么。
为什么在一分钟内会中断四次。给说说原理。

Answer 1

1.网络环路的问题比较麻烦，一般只能通过插拔每根网线来进行排查。2.平时多注意交换机端口的指示灯，如果指示灯狂闪不停，要注意分析。3.可以安装WFilter里面的“网络健康度检测插件”，间或运行下，有环路也可以检测出来。