Locating an IP Conflict on a Huawei S5700 Switch Using ARP Inspection
The article explains how to identify the MAC address and switch port of a device causing an IP conflict on a Huawei S5700 by disconnecting the server, ping testing, telneting to the switch, and executing a specific ARP display command.
When an IP address conflict occurs and the server cannot change its IP due to permission restrictions, first unplug the server's network cable, then use another computer to ping the server's address; a successful ping indicates the device is still on the LAN.
Next, telnet into the Huawei switch (e.g., S5700) and run a single command to retrieve the MAC address associated with the conflicting IP. The command is:
dis arp | in 192.168.1.100
The switch returns output similar to:
IP ADDRESS MAC ADDRESS EXPIRE(M) TYPE INTERFACE VPN-INSTANCE VLAN ------------------------------------------------------------------------------ 192.168.1.100 0023-2452-dd1b 7 D-0 Eth0/0/20 ------------------------------------------------------------------------------ Total:31 Dynamic:29 Static:0 Interface:2
From this result you can see that the IP 192.168.1.100 is attached to interface Eth0/0/20 , allowing you to locate the conflicting device.
If the MAC address cannot be found, you may disable the offending MAC on the switch, which will typically trigger a notification call, or you can check the switch logs with display logbuffer to see IP conflict reports.
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