局域网出现port “假死状态”

gooutya1

我的2960交换机，一些端口工作一段时间后就不能通行了，sh int status 显示“connected”，但是电脑已经不能上网了，5分钟以后会reset，正常通信，也可以 进入到端口 shut之后再up，可立即恢复工作。

请问是什么原因呢？我做了镜像端口后抓了一些包，发现这些，是正常的么？


1151        4.446096        18:03:73:c0:b2:f8        Broadcast        ARP        Who has 10.200.96.1?  Tell 10.200.96.84

这种包特别多。

gooutya1

请高手指点

realdreams

STP? Port security?
可立即恢复工作? 你用了no spanning ?

ssffzz1

看看控制台有什么信息吐出来。

gooutya1

我得局域网里面一直不稳定，不定时断网，断的时候，电脑上面的网络连接显示正常，交换机上的口也显示“connected”，但是就是data传输不了。要等几分钟之后又能恢复。

gooutya1

Log Buffer (4096 bytes):
%LINK-3-UPDOWN: Interface FastEthernet0/31, changed state to down
1d02h: %LINK-3-UPDOWN: Interface FastEthernet0/31, changed state to up
1d02h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/31, changed state to up
1d03h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/39, changed state to down
1d03h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/39, changed state to up
1d03h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/39, changed state to down
1d03h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/39, changed state to up
1d03h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/3, changed state to down
1d03h: %LINK-3-UPDOWN: Interface FastEthernet0/3, changed state to down
1d03h: %LINK-3-UPDOWN: Interface FastEthernet0/3, changed state to up
1d03h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/3, changed state to up
1d03h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/3, changed state to down
1d03h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/3, changed state to up
1d03h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/28, changed state to down
1d03h: %LINK-3-UPDOWN: Interface FastEthernet0/28, changed state to down
1d03h: %LINK-3-UPDOWN: Interface FastEthernet0/28, changed state to up
1d03h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/28, changed state to up
1d03h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/28, changed state to down
1d03h: %LINK-3-UPDOWN: Interface FastEthernet0/28, changed state to down
1d03h: %LINK-3-UPDOWN: Interface FastEthernet0/28, changed state to up
1d03h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/28, changed state to up
1d03h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/28, changed state to down
1d03h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/28, changed state to up
1d03h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/22, changed state to down
1d03h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/22, changed state to up
1d04h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/31, changed state to down
1d04h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/31, changed state to up
1d04h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/31, changed state to down
1d04h: %LINK-3-UPDOWN: Interface FastEthernet0/31, changed state to down
1d04h: %LINK-3-UPDOWN: Interface FastEthernet0/31, changed state to up
1d04h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/31, changed state to up
1d05h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/27, changed state to down
1d05h: %LINK-3-UPDOWN: Interface FastEthernet0/27, changed state to down
1d05h: %LINK-3-UPDOWN: Interface FastEthernet0/27, changed state to up
1d05h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/27, changed state to up
1d07h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/30, changed state to down
1d07h: %LINK-3-UPDOWN: Interface FastEthernet0/30, changed state to down
1d08h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/37, changed state to down
1d08h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/37, changed state to up
1d08h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/17, changed state to down
1d08h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/17, changed state to up
1d08h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/42, changed state to down
1d08h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/42, changed state to up
1d22h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/42, changed state to down
1d22h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/42, changed state to up
1d22h: %LINK-3-UPDOWN: Interface FastEthernet0/30, changed state to up
1d22h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/30, changed state to up

realdreams

线有问题? duplex mismatch? swap 一下端口看看是端口的问题还是线的问题

apen

一、网线质量是否达标，建议做一下测试。
二、速率与双工协商是否有问题，可以手动设置一下。
三、环境中是否有较强的干扰源？

gooutya1

hello,问题找到了，是arp攻击，有一个mac地址总是扮演我的网关进行arp回复