1、現(xiàn)象
局域網(wǎng)的用戶上網(wǎng)慢；
2、處理過程
1）局域網(wǎng)出口鏈路查看無問題；
2）查看核心交換機(jī)的日志
*Jun 19 10:19:43: %NFPP_ARP_GUARD-4-DOS_DETECTED: Host<IP=192.168.1.235,MAC=N/A,port=Gi0/22,VLAN=1> was detected.(2015-6-19 10:19:43)
*Jun 19 10:53:44: %NFPP_ARP_GUARD-4-DOS_DETECTED: Host<IP=192.168.1.96,MAC=N/A,port=Gi0/24,VLAN=1> was detected.(2015-6-19 10:19:44)
*Jun 19 10:54:14: %NFPP_ARP_GUARD-4-DOS_DETECTED: Host<IP=N/A,MAC=001e.904a.eccd,port=Gi0/24,VLAN=1> was detected.(2015-6-19 10:19:44)
*Jun 19 10:54:44: %NFPP_ARP_GUARD-4-DOS_DETECTED: Host<IP=192.168.1.174,MAC=N/A,port=Gi0/24,VLAN=1> was detected.(2015-6-19 10:19:44)
*Jun 19 10:55:14: %NFPP_ARP_GUARD-4-DOS_DETECTED: Host<IP=N/A,MAC=001e.904a.2fa0,port=Gi0/24,VLAN=1> was detected.(2015-6-19 10:19:44)
*Jun 19 10:55:44: %NFPP_ARP_GUARD-4-DOS_DETECTED: Host<IP=192.168.1.174,MAC=N/A,port=Gi0/22,VLAN=1> was detected.(2015-6-19 10:19:44)
初步判斷是環(huán)路問題职祷。
3）通過在交換機(jī)配置開啟環(huán)路檢測命令，發(fā)現(xiàn)
*Jun 19 10:55:01: %PORT_SECURITY-4-ERR_RECOVER: Interface GigabitEthernet 0/22 recover from an error.
*Jun 19 10:55:01: %RLDP-3-LINK_DETECT_RECOVER: rldp recover interface GigabitEthernet 0/22 from loop error
*Jun 19 10:55:03: %LINK-3-UPDOWN: Interface GigabitEthernet 0/22, changed state
to up.
*Jun 19 10:55:03: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet 0/22, changed state to up.
*Jun 19 10:55:03: %RLDP-3-LINK_DETECT_ERROR: loop detection error detect on interface GigabitEthernet 0/24.set this interface errordisable!
*Jun 19 10:55:05: %LINK-3-UPDOWN: Interface GigabitEthernet 0/24, changed stateto down.
*Jun 19 10:55:05: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEtherne
t 0/24, changed state to down.
?發(fā)現(xiàn)在GigabitEthernet 0/22和GigabitEthernet 0/24端口下存在環(huán)路問題，具體處理一下該端口下的問題堪旧。
